Compilation, Assessment and Expansion of the Strong Earthquake Ground Motion Data Base Seismic Safety Margins Research Program (SSMRP)

XA04NO348 NUREG/CR-1660 UCRL-B227

INIS-XA-N--049

C. B. Crouse, J. A. Hilernan, B. E. Turner, G. R. Martin Fugro, Inc.

Prepared for U.S. Nuclear Regulatory Commission

LAVMENCE LIVERMORE LABORATORY NOTICE

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, or any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party's Ue, or the results of such use, of any information, apparatus product or process disclosed in this report, or represents that its use by uch third par.ty would not infringe privately owned rights.

Available from

GPO Sales Program Division of Technical nformation and Document Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555

and

National Technical nformation Service Springfield, Virginia 22161 NUREG/CR 1660 UCRL 15227 R6, RA, RD, RJ, RM

Compilation, Assessment and Expansion of the Strong Earthquake Ground Motion Data Base

Seismic Safety Margins Research Program (SSMRP)

Manuscript Completed: April 1980 Date Published: September 1980

Prepared by C. B. Crouse, J. A Hileman, B. E. Turner, G. R. Martin Fugro, Inc. Lawrence Livermore Laboratory 7000 East Avenue Livermore, CA 94550

Prepared for Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, D.C. 20555 NRC FIN No. A0139

ABSTRACT

A catalog has been prepared which contains information for:

(1) world-wide, ground-motion accelerograms 2 the accelerograph sites where these records were obtained, and 3 the seismological parameters of the causative earthquakes. The catalog is limited to data for those accelerograms which have been digitized and published. In addition, the quality and completeness of these data are assessed.

This catalog is unique because it is the only publication which contains comprehensive information on the recording conditions of all known digitized accelerograms. However, information for many accelerograms is missing. Although some literature may have been overlooked, most of the missing data has not been published. Nevertheless, the catalog provides a convenient reference and useful tool for earthquake engineering research and applications.

SUMMARY AND CONCLUSIONS

Fugro, Inc., under contract to Lawrence Livermore Laboratory,

has compiled information for nearly 1,000 digitized accelero-

grams from 16 countries. This information was cataloged and

stored on magnetic tape. The catalog consists of computer

printout listings of three data tables (Digitized Accelerogram,

Recording Station, and Earthquake) for each country. All

information appearing in the catalog has been referenced.

Listings of the digitized accelerograms themselves have been

omitted from the catalog; however, the sources where these data

can be obtained has been identified.

The country with the largest number of accelerograms documented

in this catalog is Japan 336), closely followed by the United

States 329) and Italy 170). The number of records from other countries is small by comparison. Approximately one-

third of the U.S. accelerograms were recorded during the 1971

San Fernando earthquake, and nearly all of the Italian accelerograms came from the 1976 Friuli earthquake and aftershock sequence. Nearly all of the western hemisphere accelerograms have been completely processed with routine computer programs developed by Trifunac and Lee 1973) or updated versions of these programs developed by Basili and Brady 1978). Generally, accelerograms outside the western hemisphere have not been corrected for baseline drift errors and the instrument response, although efforts are now underway in many countries to make these corrections. Vi

The completeness of information pertaining to the characteristics of any particular accelerogram and its recording conditions varies considerably. Generally, the countries with the most complete information are Japan, the U.S., and Italy, although information for the earlier accelerograms from these countries is usually not as complete as for the more recent ones. most of the missing information has not been published, although some of it almost certainly exists. For some data classes, such as earthquake source parameters, much of the desired information has never been determined.

The reliability and uncertainty of the reported data is highly variable and difficult to assess generically. These issues must be addressed on case-by-case basis from the information provided in the catalog. v

TABLE OF CONTENTS

Page

LIST OF TABLES ix

LIST OF FIGURES ix

ACKNOWLEDGMENTS ...... xi

1. INTRODUCTION ...... 1

2. WORLD-WIDE ACCELEROGRAM DATA ...... 5

2.1 Argentina ...... 6

2.2 Chile ...... 8

2.3 China ...... 9

2.4 El Salvador ...... 11

2.5 Greece ...... 12

2.6 Italy ...... 14

2.7 Japan ...... 17

2.8 Mexico ...... 22

2.9 New Guinea ...... 24

2.10 New Zealand ...... 26

2.11 Nicaragua ...... 27

2.12 Peru ...... 28

2.13 Romania ...... 30

2.14 United States ...... 31

2.15 U.S.S.R ...... 36

2.16 Yugoslavia ...... 37

3. QUALITY OF STRONG-MOTION DATA ...... 39

3.1 Introduction ...... 39

3.2 Completeness of Strong-Motion Data Base, . . . . 39 vi i i

TABLE OF CONTENTS (Cont.)

Page

3.3 Uncertainties in Some Relevant Parameters . . . 40

3.4 Quality of the Seismological Data ...... 41

3.5 Digitization and Processing Errors ...... 47

4. REFERENCES CITED IN REPORT ...... 52

APPENDICES

A. STRONG-MOTION DATA CATALOG ...... 56

A.1 Introduction ...... 56

A.2 Description of Catalog and Users Guide . . . . 56

A.3 Abbreviations Used in Catalog ...... 61

A.4 References Used in CatalSla ...... 72

B. CHARACTERISTICS OF STRONG-MOTION ACCELEROGRAPHS. . 121 ix

LIST OF TABLES

Table No. Title

B-1 Instrument Characteristics

LIST OF FIGURES

Figure No. Title

3-1 Comparison of accelerogram corrected by CIT and USC.

3-2 Response spectra of accelerogram corrected by CIT and USC.

3-3 Comparison of digitization noise for Japanese and U.S. accelerograms

3-4 Uncorrected and corrected accelerogram processed by Japan's SEMOC

3-5 Response spectra of uncorrected and corrected Hoshina-A (EW) accelerogram processed by Japan's SEMOC

3-6 Hoshina-A (EW) accelerogram corrected using USGS SEB computer program with decimation to At = 002 sec.

3-7 Response spectra of Hosina-A (EW) accelerogram corrected with SEMOC and USGS SEB procedures.

3-8 Hoshina-A (EW) accelerogram corrected using USGS SEB computer program with decimation to At = 0.01 sec.

3-9 Response spectra of Hosina-A (EW) accelerogram corrected with SEMOC and USGS SEB procedures.

-X

ACKNOWLEDGMENTS

This project was performed for Lawrence Livermore Laboratory

(LLL) under LLL subcontact 3900109. The technical coordinator for LLL was Don Bernreuter.

The following Fugro personnel participated in the project:

Geoffrey Martin - Project Manager

C. B. Crouse - Co-Principal Investigator

Jim Hileman - Co-Principal Investigator

Barbara Turner - Analyst

Seiji Uehara - Engineering Assistant

Richard Miller - Engineering Assistant

Don Chambers - Engineering Assistant

Lynn Williams - Engineering Assistant.

Seiji Uehara has been working for Fugro during a leave-of- absence from his Japanese employer, Sumitomo Construction Co.,

Ltd. Mr. Uehara was extremely helpful in compiling the

Japanese accelerogram data.

Significant contributions to the project were made by a number of people outside Fugro. We are particularly indebted to

Drs. Gerald Brady and Fritz Matthiesen of the U.S. Geological

Survey, who supplied a considerable amount of information on the world-wide strong-motion data base. Others who contributed significantly were: -Xii

ACKNOWLEDGMENTS (Cont.)

Professors Don Hudson, - California Institute of Hiroo Kanamori, and Technology Paul Jennings

Professor M. D. Trifunac - University of Southern California

Dr. Iwao Morimoto - Kisojiban Consultants Co., Ltd., Japan

Dr. Jim Beck - DSIR, New Zealand

Dr. Nove Naumoski - IEEES, Yugoslavia

Professor N. N. Ambraseys - Imperial College of Science and Technology, London

Dr. Francesco Muzzi - CNEN-DISP, Italy 1. INTRODUCTION

The purpose of this project was to compile, expand, and assess the quality of the strong earthquake ground-motion data base.

The project was performed for Lawrence Livermore Laboratory

(LLL) of the University of California under their subcontract

3900109. The work is part of LLL's Seismic Safety Kargin

Research Program (SSMRP) which is being conducted for the U.S.

Nuclear Regulatory Commission.

Because of the extremely large number of accelerograms that have been recorded throughout the world, the scope of our work was confined to only those ground-motion accelerograms which have been digitized and published. Furthermore, accelerograms were not included from the crest or face of dams or from above ground-level locations in buildings or other structures. Even with these constraints, a total of 987 accelerograms from 16 countries were documented. Information for each accelerogram has been entered in a catalog and on magnetic tape. Well over

500 references and a number of leading authorities in the earthquake engineering field from all over the world were consulted for this project.

With regard to the collection of the accelerogram data, as much information as possible was gathered for each accelerogram and placed into the following three data tables: (1) Digitized

Accelerogram 2 Recording Station, and 3 Earthquake. The kinds of information appearing in each of these tables is listed below; 2

(1) Digitized Accelerogram

Date and time of earthquake

Location and I.D. number of recording station

Source, I.D. number, and digitized length of accelero-

gram

Earthquake magnitude and site intensity

Source-site distances (epicentral, hypocentral,

closest approach, center of energy release)

Amount and type of accelerogram processing

Accelerogram characteristics (uncorrected peak accel-

eration, corrected peak acceleration,.velocity and

displacement, and RMS acceleration)

(2) Recording Station

Location, coordinates, and I.D. number

Structure housing instrument (size and type)

• Type of instrument and location within structure

• Local geology (description and classification)

(3) Earthquake

Date and time

Location description and hypocentral coordinates

(including location uncertainty',

Magnitudes (MLF MSf MJMAI Mb)

Maximum intensity

9 Source dimensions (length, width, radius, area)

Seismic moment and stress drop 3

0 Source rupture characteristics (fault type, strike,

dip, displacement, slip and rupture directions, rup-

ture velocity).

The tables have been constructed to permit easy cross referencing. Values assigned to each parameter have been referenced.

The information in the tables has been organized by country and stored on computer tape. The accompanying catalog containing this information consists of computer printout listings of the three tables for each country.

This report is organized as follows. Section 2 gives an over- view discussion of the accelerogram data collected for each country represented in the catalog. Section 2 also discusses accelerograms which have not been included in the catalog either because of their recency or their proprietary nature. Section 3 assesses the quality of the accelerogram data with regard to: (1) completeness and uncertainties of the data, and 2 digitization noise and processing errors in the accelerograms. Section 4 lists the references cited in the text portion of this report. Appendix A describes the catalog and how to use it. A separate subsection in Appendix A lists the references cited in the data catalog. Appendix gives the nominal characteristics and specifications of the types of accelerographs listed in the catalog.

Finally, it should be noted for completeness that Pakistan,

India, Iran, Turkey, Philippines, and Portugal have recorded 4

accelerograms which have been digitized but not published, and thus, these data were not included in the catalog. Most of these accelerograms were digitized and processed by Professor

N.N. Ambraseys at the Imperial College of Science and Technology in London and are not available for distribution at this time. 5

2. WORLD-WIDE ACCELEROGRAM DATA

This section presents a discussion of the accelerogram data that appears in the catalog accompanying this report. Generally the discussion includes a brief summary for each country of the: (1) accelerogram data included and excluded from the catalog, 2 sources of data, 3 details of the digitization, and 4 completeness of the data pertaining to the recording conditions. For other details or more specific information, the reader should consult Appendices A and and the catalog. 6

2.1 ARGENTINA

To our knowledge, the only accelerograms from Argentina that have been digitized were those recorded during the November 23,

1977 San Juan earthquake and the December 6 1977 aftershock.

An AR-240 accelerograph at the Instituto Nacional de Prevencion

Sismica (INPRES) in San Juan recorded ground motion from the magnitude-7.4 main shock. The same instrument and another

AR-240 located in the town of Caucete recorded ground motions during the magnitude-5.9 aftershock. The collection, digiti- zaton and processing of these records were performed under the direction of Chris Rojahn at the Seismic Engineering Branch of the U.S. Geological Survey (USGS). Details of this effort are described in a draft report by Rojahn and others 1980).

The records were digitized on a Calma digitizing system and processed with standard computer programs developed at the U.S.

Geological Survey 1976). These programs are upgraded versions of those developed by Trifunac and Lee 1973) with modifications to the correction procedure at long periods as proposed by Basili and Brady 1978). Currently, the processed records are available on request from Rojahn; in the future they will become available from the Environmental Data and Information

Service (EDIS) of the National Oceanic and Atmospheric Adminis- tration (NOAA).

Information on the intensities and certain source parameters of these two earthquakes were not located. Some information on the seismological aspects of these events can be found in a 7

draft report by Algermissen and Jordan, which will be published with the Rojahn and others' 1980) paper in a USGS Professional

Paper. other information on the coordinates and foundation conditions of the INPRES and Caucete recording stations could not be found in the literature. Personal inquiries with

Castano or Zamarbide of INPRES, coauthors with Rojahn, might be the best way of obtaining this information if it is desired.

According to Rojahn and others 1980), two other accelerograms during the main shock and an accelerogram from the January 17,

1978 magnitude 5.5 aftershock were also recorded. These records have not been processed by the USGS and their current status is unknown. 8

2 2 CHILE

Only one component of one accelerogram, recorded at the Univer- sity of Chile in Santiago, is presently available. The accelerogram was generated during a magnitude 75 earthquake which occurred on July 9 1971, approxmately 140 km from Santiago.

The NlOW component has been digitized and processed by Woodward

Clyde Consultants as part of the OASES 1978) project. The record was processed with standard computer programs developed by Trifunac and Lee 1973).

Other Chilean accelerograms have been digitized, but as yet, they have not been published. Most of these accelerograms were digitized by Dr. Raul Husid, currently with the Shell Oil

Company in Houston. Husid has indicated (pers. comm., 1979) that the digitized data are presently stored on computer cards at the University of Chile. Some of characteristics of these records plus details of the digitization and processing appear in his book, Earthquakes (Husid, 1973). Rodolfo Saragoni, professor in the Civil Engineering department at the University of Chile and a former colleague of Husid, is currently digitizing and processing a number of Chilean accelerograms and plans to publish and distribute reports containing these data. 9

2.3 CHINA

Listings of digitized accelerogram data recorded during the

larger aftershocks of the catastrophic Tangshan earthquake of

July 28, 1976 have been published by the National Civil Engi-

neering Earthquake Research Institute and the Beijing Ground

Motion Aseismic Committee in a catalog entitled, "Engineering

Strong Ground Motion Recording Catalog." This catalog was

published in March, 1978 and has not been widely distributed

outside of China. Fugro has a copy of the catalog, but because

it is rather fragile and difficult to reproduce, we suggest

that persons interested in obtaining a copy should write to:

Wang Kai-shen

Institute of Structural Research

Post Box No. 7 S-2

Beijing, China

In addition to the above catalog, Fugro also has a listing of

the Tianjin accelerogram recorded during the magnitude-6.9

Ninghe earthquake on November 15, 1976.

The above accelerograms were recorded on a Chinese-made RDZ

1-12-66 accelerograph. Details of the digitization process are

not known; however, it is clear that the accelerograms were not

corrected for the instrument response or baseline drift. The

peak accelerations of the uncorrected accelerograms in the catalog are less than 0.03g; the peak accelerations of the

Tianjin accelerogram are about 0.1g. The natural frequency of

the pickup transducer in the RDZ accelerograph is between 4 and 10

4.5 cps. The overall system characteristics are such that the response is flat from 0.5-35cps; therefore, correcting these records for the system response could significantly increase the lower frequency accelerations (NAS, 1980).

Fritz Matthiesen of the USGS recently received a catalog of

'Uncorrected Accelerograms of the Tangshan Earthquake' published in 1978 by the Chinese Academy of Sciences, Institute of

Engineering Mechanics. The catalog contains only plots of the uncorrected accelerograms and information on their recording conditions. The Chinese have digitized these records and have sent listings to Fritz Matthiesen. He and Peter Mork are currently checking the digitization and will eventually process the records. This task should be completed in 1980 and the data will become available to the public shortly thereafter.

These records have not been included in our catalog; however, a brief summary of their recording conditions can be found in

Table 49 of NAS 1980) .

To our knowledge no accelerograms have been recorded in Taiwan that have been published and distributed on a worldwide basis.

One publication, listed below, contains plots of accelerograms but no digitized data:

Catalog of Strong-Motion Accelerograph Stations and

Records in Taiwan, Vol. 1, Institute of Earth Sciences,

Academia Sinica, Taipei, Taiwan, authors: Hung-Chie Chiu

and Wen-Shiang Liu, December, 1978.

Dr. A. G. Brady of the USGS has a copy of this catalog. 2.4 EL SALVADOR

Two accelerograms have been recorded that were subsequently digitized and processed by the USGS. These data are available

at EDIS-NOAA and will be published in 1980 in a USGS open-file

report. The accelerogams were recorded-at the Seismic Obser- vatory in San Salvador very close (within 10 km) to two earthquakes which occurred within 10 minutes of each other.

Although little information exists on these earthquakes, the

recorded peak accelerations, duration of shaking, and intensity suggest that they were small shocks. We were not able to find

information on the local geology at the Seismic Observatory or the foundation characteristics of the building. 12

2.5 GREECE

Eight ground-motion accelerograms, recorded between 1972 and

1975, have been digitized and partially processed. Listings of these data as well as information on the method of digiti-

zation, processing procedures, and recording conditions appear

in the USGS Open-File Report 78-1022 (USGS, 1978b). The

records were digitized with a Hewlett Packard manual digitizer

at the Laboratory of Testing Materials of the National Technical

University (NTU) of Athens. The rate of digitization was

approximately 120 points per second. The raw data were then

scaled to units of acceleration and time. The scaled data was

corrected only for baseline drift using a parabolic baseline

correction developed by Brady 1966). No instrument or other

corrections were performed. P. G. Carydis and J. G. Sbokos of

NTU were responsible for this work.

Although the information about the digitized accelerograms is

fairly complete, data on the recording stations are lacking.

Missing are the station names, coordinates, and the foundation

characteristics of the buildings. The local geologic descrip-

tions are also incomplete with usually one-word descriptions

such as "alluvium" given. We also noticed a few discrepancies

between the peak accelerations shown in the heading information

at the top of the acceleration-time history listing and the

maximum accelerations within the listing themself. Our tables

report the maximum accelerations within the listings. 13

A ground-motion accelerogram was recorded on June 20, 1978 during the magnitude-6.5 Thessaloniki earthquake. Some details of this earthquake have been reported by Psycharis 1978). The maximum recorded acceleration was abut 013 g (Ambraseys,

1978). Our understanding is that P. G. Carydis is currently

processing the record. 14

2 6 ITALY one of the better sets of accelerogram data in terms of number of records and completeness of documentation was produced jointly by the Italian State Power Board (ENEL) and the Italian

Commission for Nuclear Energy (CNEN) after the May 6 1976

Friuli earthquake of magnitude 62 and aftershock sequence.

The number of records digitized totaled 160. Listings of the uncorrected accelerograms appear in Volume I, Parts through

4, of the CNEN-ENEL publications, "Strong motion earthquake accelerograms, digitized and plotted data." These publications are similar in format to the Caltech Volume I data reports; in fact, all subsequent data reports containing the corrected accelerograms, velocities and displacements (Volume II) and response spectra (Volume III) will be similar to the Caltech

Volume II and III reports. These reports will be published in the near future, and magnetic tapes containing the data will also be available.

The accelerograms were manually digitized by trained personnel on a D-Mac Ltd System-2 data reducer. The rate of digitization was as high as 120 points per second. The data were then scaled to units of acceleration (g/10) and time, and the baseline was shifted to minimize the RMS acceleraton. The resulting time histories are termed the "uncorrected accelerograms."

In the Preface to Volume I - Part I of the CNEN-ENEL data reports, a program is outlined for processing the uncorrected accelerograms. The routine computer programs developed at 15

Caltech (Trifunac and Lee, 1973), with modifications to some of the numerical analysis subroutines, and programs developed by

Basili and Brady 1978) dealing with long period errors will be implemented.

Most of the information on the recording conditions was found in the CNEN publications, "Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the Antiseismic Design of

Nuclear Installtions," (Volumes I, II, III, OECD-NEA/CSNI

Report No. 28, May, 1978). The information is fairly complete except for the accelerograms recorded toward the end of the aftershock sequence. For these records information on the causative earthquakes was not reported.

Before the Friuli earthquake, the CNEN-ENEL accelerograph network had recorded ground motions from 27 earthquakes, most of which occurred near Ancona in 1972 (see Introduction to

Volume I - Part I of CNEN-ENEL Friuli earthquake data reports).

The publication of reports containing the earlier records was suspended until after completion of the Friuli reports.

However, ten of the Ancona records were given to the Caltech

Earthquake Engineering Research Laboratory shortly after the

Ancona earthquake sequence in 1972. The records were then processed by Dr. A. G. Brady using the Caltech routine computer programs (Trifunac and Lee, 1973) with a cutoff frequency of

0.25 cps for the long-period filtering. 16

The Ancona accelerograms were recorded at two sites, Palombina and Rocca; however, we could not find any definitive information on the coordinates of these stations or the structures containing the recording instruments.

Most permanent accelerographs in the ENEL network, including those in the Friuli region, are lcoated in small transformer stations (CNEN-ENEL, 1976). These structures are small, brick buildings with a stone floor approximately 3 m square. The instrument is bolted to a circular concrete pad which is embedded directly into the ground. The CNEN-ENEL 1976) reference did not list the stations that were different from the transformer sheds, and consequently we prefered not to list foundation dimensions for the ENEL stations in our Recording

Station tables. 17

2 7 JAPAN

2.7.1 Introduction

The largest number of digitized accelerograms comes from Japan.

This country has an extensive network of Japanese-made accelero-

graphs which are operated by several organizations. The rate

of seismicity is considerable and a large number of accelero-

grams are recorded each year. The first accelerogram digitized

was recorded in 1956, and the number of accelerograms recorded

and ditigized after that was relatively limited for some time.

However, in 1968 five major earthquakes triggered numerous

instruments throughout the country, and a vast number of

accelerograms were recorded and subsequently processed. The

total number of accelerograms that we have cataloged in our

tables from 1956 through 1978 is 336. A total of 137 stations

recorded one or more of these accelerograms which were genera-

ted by 143 earthquakes. Based on our discussions with Japanese

earthquake engineers, we estimate that our catalog contains

about 90 percent of the digitized accelerogram data which has

been published and is publically available.

2.7.2 Sources of Digitized Accelerograms

The Japanese accelerogram data appearing in our Digitized

Accelerogram tables comes from the following sources:

0 Port and Harbor Research Institute (PHRI) of the Ministry of

Transport.

9 Public Works Research Institute (PWRI) of the Ministry of

Construction. 18

0 Strong Earthquake Motion Observaton Center (SEMOC) of the

Earthquake Research Institute, University of Tokyo.

Digitized Strong-Motion Earthquake Accelerograms (DSMEA)

in Japan, 1972, compiled by the Committee for DSMEA, pub-

lished by Gakujutsu Bunken Fukyukai.

9 Woodward Clyde Consultants, Three Embarcadero Center,

San Francisco, California.

The PHRI and PWRI agencies operate extensive strong-motion networks throughout the entire country. As a result, they have recorded most of the accelerograms, but they have digitized only those with peak accelerations greater than about 0.05 g.

These two agencies do some initial processing to the digitized accelerograms, such as removing the arcuate appearance of the accelerogram due to the rotation of the recording pen, before publishing listings of the accelerograms in data reports.

The accelerograms listed in these reports are essentially

"uncorrected" because no instrument or baseline correction has been made. The PHRI is conducting considerable research on methods for correcting the accelerograms. They have recently adopted a rocedure which in principle appears to be similar to the programs developed at Caltech, and are now including the corrected peak accelerations, velocities and displacements in tables in their reports. Their correction procedures are described in detail in PHRI (1978b). The PWRI, to our knowledge, has not corrected their accelerograms, and apparently are not conducting much research, if any, in this area. 19

A small number of accelerograms recorded during the 1966

Matsushiro swarm earthquakes of magnitudes about 4 to are contained in the SEMOC publication, "Digital Data of the

Strong-Motion Earthquake Accelerograms in Matsushiro Earthquake

Swarm Area." This publication has listings of all the uncorrected accelerograms and a listing of one record which was corrected. Details of the correction procedure are incomplete, but the type of band-pass filter and the parameters of this filter are given. In Subsection 35 of this report, "Digiti- zation and Processing Errors," the corrected record listed in the SEMOC report is compared to another corrected version obtained using the Caltech computer processing programs

(Trifunac and Lee, 1973).

The book, Digitized Strong-Motion Earthquake Accelerograms in Japan, 1972, not only provides listings of 47 partially corrected accelerograms, but also documents conditions under which they were recorded. Soil borings, structural plans and photographs are given for each site; earthquake location, date and intensities are included for each causative earthquake.

The preface describes the methods of digitization and correction. The only correction made to the uncorrected records was a third order polynomial adjustment using Ohsakils method.

The final source of digitized accelerogram data was Woodward

Clyde Consultants who collected and digitized many records including four additional records not listed in the four previously mentioned sources. Photo copies of these additional accelerograms are shown in data reports compiled by 20

the Strong-Motion Earthquake observation Committee and published by the National Research Center for Disaster Prevention.

Woodward Clyde Consultants have processed these accel-erograms and other records from the other four sources with the Caltech computer programs (Trifunac and Lee, 1973). Fugro, Inc. has also processed many Japanese accelerograms from these sources using the Caltech programs, and descriptive information is

included in the Digitized Accelerogram table.

2.7.3 Digitization Methods

The PHRI is the only Japanese agency to our knowledge that has published detailed accounts of their digitizing hardware, methods of digitization, and errors involved (PHRI, 1978a, b).

The PHRI currently uses two digitizers, one for SMAC-B2 accelerograph records and the other for ERS-B/C accelerograph records.

Both machines are semi-automatic and require a trained operator to follow the trace with the cross-hair piece. The traces are digitized at intervals of 0.1 mm which corresponds to about

0.01 sec for SMAC-B2 records and 00025 to 0.005 sec for

ERS-B/C records. Discussion of the digitization errors is presented in Subsection 34.

2.7.4 Completeness of Data on Recording Conditions

For the most part information pertaining to the recording stations and generating earthquakes is complete. Compiling this

information can be difficult because most of the appropriate

references are in Japanese. Fortunately, we acquired the services of Mr. Seiji Uehara a civil engineer from Sumitomo 21

construction Co. in Japan, who translated these documents and

compiled most of the information in our tables. However,

some information on the recording stations and earthquake

source parameters could not be found.

In the Earthquake table, two locations determined by the Japan

Meteorological Agency (JMA) are often listed. One is the

orginal location and the other is a recently revised location.

For most earthquakes there are only small differences between

the two. The reason for listing the original location is that

it has been used by the Japanese engineers to compute epicen-

tral distance. Epicentral distances based on the original

locations are the ones being reported in certain Japanese

data reports and are the ones we have listed in our Digitized

Accelerogram tables. However, epicentral distances based

on the revised locations can easily be computed, and would be

preferred over the distances listed in our tables for any

analysis of the accelerogram data.

2.7.5 Digitized Accelerograms not Available

The PWRI has digitized but not published many accelerograms which were recorded after 1967 (T. Iwasaki, pers. comm.). The

PWRI has published the more significant accelerograms recorded during this time period, and these records have been listed in our tables.

We understand that a limited number of accelerograms have been digitized by utility companies and other agencies, such as the

National Railroad, for their own use and have not been published. 22

2.8 MEXICO

Many ground-motion accelerograms have recently been recorded during five large-magnitude earthquakes in Mexico. These earthquakes occurred in an one-year span beginning November,

1978, and all but the October 15, 1979-Imperial Valley earthquake were located in the south and southwestern sections of the country. These records are mentioned first because of their importance, but they are not yet available and have not been included in our tables. The accelerograms are being processed by the Instituto de Ingenieria of the Ciudad Univer- sitaria in Mexico City. This effort is being directed by

Professor Jorge Prince. So far, two preliminary accelerogram data reports have been prepared, one for the November 25, 1978

Oaxaca earthquake (Espinosa, 1978), and another for the March

14, 1979 Guerrero event (Alonso, 1979). These reports do not present listings of the digitized accelerograms, and it is our understanding these data will not be released until the processing has been completed.

Data pertaining to 13 digitized accelerograms recorded in 1962 and 1973 have been included in our tables. The 1962 accelerograms were recorded at two sites 600 m apart in Mexico City during two earthquakes of magnitude 7 occurring at a distance of about 260 km from the city. Both horizontal components from four records were digitized by first enlarging the traces and then measuring the coordinates by hand with a ruler (P. C.

Jennings, pers. comm.). Listings of the uncorrected 23

accelerograms appear in Jennings 1962). The time increment between points is 0.1 sec. The vertical components have never been ditigized. These records have received international attention because their character has been widely quoted in the literature as being the result of the amplification of the seismic waves by the soft soil deposits in Mexico City.

The 1973 records were digitized and processed at the Earthquake

Engineering Research Laboratory (EERL) at Caltech with the same equipment and computer programs used to process the western U.S. accelerograms appearing in the Caltech data reports. Caltech has not published these Mexican data, but they can be obtained from the EERL.

Nothing has been published on the recording stations, other than the two in Mexico City, that we are aware of. Details of the structure, foundation conditions and local geology at the

Alameda Park and Tower Latino Americana sites in Mexico City can be found in Jennings 1962) and Zeevaert 1964). 24

2.9 NEW GUINEA

A total of 48 accelerograms recorded from 1967 through 1974

have been digitized by the Strong Motion Data Centre, Bureau of

Mineral Resources, Canberra, Australia. This work was performed

under the direction of Denham and Small, and computer tapes

containing these data were forwarded to EDIS-NOAA in Boulder,

Colorado. We could not locate information on any accelerograms

the bureau may have processed since 1974.

According to Denham and Small 1971), the earlier accelerograms

were digitized at 002 sec on a scaling table using a 4096

position encoder. The overall accuracy of the system was about

0.1 mm or 0.001g. No literature is available to confirm whether

the same system was used to digitize accelerograms recorded

after 1970.

The accelerograms have been corrected, but the exact methods

that were used are not clear. According to Denham and Small,

the correction procedures were still under development, but

they indicated that the accelerograms recorded up through 1970

had been corrected for baseline drift and scaling errors by

using a high-pass filter. However, no instrument correction

was indicated. On the other hand, Murphy and O'Brien 1978)

through a personal communication with J. C. Dooley in 1976

state that an instrument correction was made to the accelero-

gram data. We have been unable to resolve this matter. 25

Little information exists in the literature on the recording conditions for the accelerograms. Information on site intensity and epicentral distance comes from a magnetic tape of world-wide accelerogram data prepared by Computer Sciences

Corporation (CSC). Analyses of these data can be found in a report by Murphy and O'Brien 1978). The values of peak acceleration listed in our tables come from magnetic tapes of time-history data supplied by EDIS-NOAA. However, some of the data on their tape appears to be erroneous and has been noted as such in our tables. Recording station information is quite incomplete; the only sources available are the publication by

Denham and Small 1971) and the CSC computer tape. Data pertaining to the generating earthquakes are confined mainly to the earthquake location, magnitude, and in some cases, intensity. 26

2.10 NEW ZEALAND

The Physics and Engineering Laboratory (PEL) of the Department of Scientific and Industrial Research (DSIR) in New Zealand is responsible for digitizing and processing accelerograms A total of 17 accelerograms have been digitized on a locally-made, digitizer (D.E. Hudson, pers. comm.) at every 002 sec (Hodder and others, 1978). These digitized records have been processed through stages equivalent to Caltech's Volumes I through IV data reports (J. Beck, pers. comm.) although the processing methods used have not been published to our knowledge. The processed data can be obtained by writing to the PEL. A report on the current operation of the New Zealand accelerograph network including the processing of accelerograms can be found in Hefford and others 1979).

Information on the recording conditions of the digitized accelerograms was obtained from Dr. J. L. Beck of the PEL. This information is complete except for some omissions of earthquake magnitudes and the dimensions and types of structures housing the instruments. 27

2.11 NICARAGUA

Eight accelerograms, including the well-known one from the ESSO refinery recorded during the magnitude-6.2, Managua earthquake of December 1972, have been digitized and processed by the

Seismic Engineering Branch of the USGS. The digitizing and processing procedures are described in detail in USGS Open-File

Report 78-941 (USGS, 1978a) and are basically upgraded techniques orginally developed at Caltech to process the western

U.S. accelerograms.

The Nicaragua accelerogram data can be obtained from EDIS-NOAA; however, plots of the accelerograms, response spectra, etc. can be found in USGS Open-File Report 78-941 and one to be published in the future. The ESSO refinery accelerogram was also processed at Caltech with long-period filter parameters sightly different than those used by the USGS. Caltech's version is available from their Earthquake Engineering Research Laboratory.

Information on the 1972 Managua earthquake and two of its aftershocks is fairly complete and can be found in the references cited above plus special reports by the Earthquake Engineering

Research Institute (EERI, 1973a, b) and the National Academy of

Science (NAS, 1975). However, information is lacking for three other earthquakes which generated accelerograms. Descriptions of the local soil conditions for the ESSO refinery and National

University recording stations could not be found. 28

2 12 PERU

Ten accelerograms recorded in Lima during large-magnitude earthquakes between 1951 and 1974 have been digitized-and processed by the Seismic Engineering Branch of the USGS. The digitizing and processing procedures are described in detail in USGS Open-File Report, 77-587 (USGS, 1977a) and are basically upgraded techniques originally developed at Caltech to process the western U.S. accelerograms. The accelerogram recorded on November 29, 1971 was processed twice by the USGS.

The earlier version, published in USGS Open-File Report 76-609

(USGS, 1976), was processed with the original Caltech computer programs (Trifunc and Lee, 1973) which used a long-period filter bandpass from 0.05 to 007 cps. The later version, processed with the upgraded programs (USGS, 1977a), was corrected using a long-period filter bandpass from 007 to 0.10 cps.

The Peruvian accelerogram data can be obtained from EDIS-NOAA; however, plots of the accelerograms, response spectra, etc. can be found in USGS Open-File Report 77-587.

Information is generally complete for all records except the

1951 accelerogram for which practically no information could be found on the generating earthquake. Information could not be found for the foundation sizes of the recording stations nor in some cases for the local soils. Special studies (see references cited in Earthquake table) have been performed to determine earthquake source parameters, such as fault-rupture dimensions, seismic moment, stress drop, and fault displacement, for the

1966, 1970 and 1974 earthquakes. 29

In addition to the ten accelerograms discussed above which have been listed in our tables, a number of Peruvian accelerograms have been digitized by Dr. Raul Husid, but as yet, have not been published. Husid has indicated (pers. comm., 1979) that the digitized data are presently stored on computer cards at the University of Chile. Some of the characteristics of these records plus details of the digitization and processing appear in his book, Earthquakes (Husid, 1973). Husid, currently with

Shell Oil Company in Houston, hopes to publish listings of these data in the future.

An accelerogram was recorded on February 16, 1979 at the

Characato Observatory in Arequipa during a magnitude-6.6 earthquake. The largest peak acceleration was 0.39g, recorded on one of the horizontal components (Huaco and Rodriguez,

1979). We understand that this record will be digitized and processed, but we have no further details. 30

2.13 ROMANIA

One accelerogram, recorded in Bucharest during the magnitude-

7.2 Vrancea earthquake occurring on March 4 1977, has been digitized and processed. Both the Seismic Engineering Branch

(SEB) of the USGS and the Building Research Institute (BRI) of Japan's Ministry of Construction have completed this work independently and have published their processed accelerogram data (USGS, 1978b; BRI, 1978). The SEB used techniques upgraded from those originally developed at Caltech for the processing of the western U.S. accelerograms, to process the

Romanian accelerogram. They digitized 16 sec of the strong motion and used a ramp from 017 to 025 cps at the long-period end of the bandpass filter in the correction program. The BRI, on the other hand, digitized 40 sec and used a ramp at the long-period end from 0.05 to 007 cps. The BRI 1978) reference does not explain any details of the digitizing or processing methods. However, we suspect that the BRI used the original Caltech computer programs (Trifunac and Lee, 1973), because the BRI has used these to process other Japanese accelerogram data in the recent past.

Information on the recording conditions for the accelerogram are fairly complete except for the site coordinates and foundation size of the recording station. These data could not be found in the literature. 3

2.14 UNITED STATES

2.14.1 Introduction

The U.S. is a close second to Japan in the total number of

accelerograms each country has digitized. A total of 329

digitized accelerograms in the U.S. have been included in our

tables. A total of 193 stations recorded one or more of these

accelerograms, which were generated by 90 earthquakes.

The earliest recorded accelerograms that were eventually

digitized were obtained during the 1933 Long Beach earthquake.

The accelerogram data bank grew relatively slowly until the

1971 San Fernando earthquake, which more than doubled the

existing data base. Since the San Fernando earthquake, many

other significant accelerograms have been recorded, and the

most noteable of these are the records from the October 15,

1979 Imperial Valley earthquake of magnitude 66, which occur-

red too recently to be included in our tables.

2.14.2 Sources of Digitized Accelerograms

The U.S. accelerogram data appearing in our Digitized Accelero- gram tables comes mainly from the following sources:

9 Data reports (Volumes I through IV) published by the Earth-

quake Engineering Research Laboratory (EERL) of the California

Institute of Technology.

9 open-file reports published by the Seismic Engineering Branch

(SEB) of the U.S. Geological Survey.

Preliminary data reports published by the California Division

of Mines and Geology (CDMG). 32

0 A report on strong-motion data from the New Madrid Seismic Zone

authored by Herrmann 1977).

The accelerogram data from the above sources is on file with the

Environmental Data and Information Service (EDIS) of the National

Oceanic and Atmospheric Administration (NOAA) in Boulder,

Colorado.

Other sources of digitized accelerogram data which have been included in our tables are:

• Magnetic tapes of 1975 Oroville aftershock accelerograms

digitized by the USGS and processed by Woodward Clyde Consul-

tants.

• Magnetic tapes at Caltech's EERL which contain accelero-

gram data recorded during post-San Fernando earthquakes.

• Professor James Brune of the University of California at

San Diego.

• Dr. Dennis Ostrom of Southern California Edison Company,

Rosemead, California.

The accelerogram data from these sources is not on file with

EDIS-NOAA, but may be obtained by contacting the individual or agency listed.

2.14.3 Digitization Methods

The digitization of accelerograms appearing in Volume I -

Uncorrected Accelerograms of the Caltech data reports was performed by a trained operator using a Benson-Lehner 099D

Datareducer unit. This system was also used to digitize accel- 33

erograms recorded after the San Fernando earthquake which are stored on magnetic tape at Caltech's EERL. The maximum resolution of the system is about 800 digital counts per inch, which corresponds to a least time interval on most records of about

0.003 sec (Brady, 1969). The accelerograms were digitized at unequal time intervals. The greatest digitization rate over the most rapidly oscillating sections of the accelerograms was about

40 points per sec (Brady, 1969). Further details on the digitization of the Caltech accelerograms can be found in the reference by Brady cited above.

Accelerograms appearing in the USGS Open-File reports of the SEB were digitized at two companies in the San Francisco area. All 12 in. and enlarged 70 mm records were digitized at

Dynamics Graphics in Berkeley on a Calma digitizing system with a resolution of about 1000 points per inch. The accelerograms are digitized at approximately 50 points per sec. IOM-TOWILL in Santa Clara digitized both the USGS and CDMG 70-mm records using a laser scanning system with a resolution of micron.

The digitization is about 500 points per sec, an order of magnitude greater than other digitization rates reported above.

The above information was taken from the Data Preparation and

Digitizing section of the SEB Open-File reports containing U.S. accelerogram data.

Accelerograms recorded in the New Madrid seismic zone which appear in Herrmann's 1977) report were digitized manually on a

Data Instrument digitizer manufactured originally by Telecom- 34

munications Corporation (Herrmann, pers. comm., 1979). Accord- ing to Herrmann, enlarged 70-mm records were digitized at a rate such that interpolation to time increments of 0.01 sec was valid.

Accelerograms recorded during the Horse Canyon earthquake of

August 2 1975, were digitized with a Calma system at Scripps

Institution of Oceanography in La Jolla, California. The records were digitized at every 0.01 in. and interpolated to equal time increments of 0.01 sec (S. Hartzell, pers. comm., 1979).

2.14.4 Completeness of Data on Recording Conditions

In general the information on the relevant recording conditions is complete. Information on the structure housing the instrument and a local geology description was not available for some recording stations. The amount of information on the local geology varied considerably from no information to the detailed soil boring data and dynamic soil properties given in the Shannon and Wilson and Agbabian reports prepared for the

U.S. Nuclear Regulatory Commission. Generally, information on earthquake source characteristics is not available for the earlier earthquakes nor for some more recent earthquakes of small magnitude. Intensity information is also incomplete for many of the older earthquakes and small magnitude events.

2.14.4 Digitized Accelerograms Not Included

Accelerograms which have been digitized by the USGS but not included in our tables are those recorded during the

Imperial Valley earthquake of October 15, 1979.

Coyote Lake earthquake of August 6 1979. 35

0 Small magnitude earthquakes in 1976-1977 located mostly in

the Imperial Valley.

9 Oroville earthquake of August 1, 1975.

A total of 22 accelerograms from the 1979 Imperial Valley

earthquake were completely processed by the USGS recently and

are now available from EDIS-NOAA.

The processing of the Coyote Lake earthquake accelerograms and

near-field accelerograms recorded during small-magnitude earth-

quakes in 1976-1977, was suspended by the USGS in favor of the

accelerograms from the 1979 Imperial Valley earthquake. The

USGS is resuming the processing of these accelerograms, and

barring another major earthquake, should complete their effort

in early 1980.

Prior to the 1979 Imperial Valley earthquake, the USGS com-

pleted the processing of the 1975 Oroville aftershock data. The

uncorrected (Volume I) and corrected (Volume II) accelerograms

are now available from EDIS-NOAA. A USGS data report on these

accelerograms is in preparation.

We are aware of a limited number of digitized accelerograms,

some the property of utility companies and others the property of researchers at various universities. However, these data

have not been published and are not readily available. 36

2.15 USSR

One accelerogram, recorded at Karakyr Point during the magnitude-7.2 Gazli earthquake, has been digitized by the Soviets.

The raw digitized data was published in a report by Shteinberg and others, which was reproduced in USGS Circular 762-A 1977).

No further processing has been done to this accelerogram by the

USGS because too many questions remain unanswered concerning the characteristics of the Soviet recording instrument and the method of digitization (C. Rojhan, pers. comm.). other information on the characteristics of the structure housing the recording instrument and some earthquake source parameters have not been published in western-world literature.

Apparently, many Soviet accelerograms from small magnitude earthquakes have been digitized by Ambraseys 1978), but these data have not been published and are not available at present.

Some of the characteristics of these accelerograms are recorded in Table II of Ambraseys' paper. 37

2.16 YUGOSLAVIA

Four accelerogram data reports have been published by the

Institute of Earthquake Engineering and Engineering Seismology

(IEEES) of the University "Kiril and Metodij" in Skopje: e Strong-motion earthquake accelerograms, digitized and plotted

data, Volume II - Uncorrected data, Part A, Accelerograms

IIA01 - IIA09, Publication No. 57, December, 1977.

Strong-motion earthquake accelerograms, digitized and plotted

data, Volume II - Uncorrected data, Part C, Accelerograms

IIC28 - IIC43, Publication No. 54, November, 1976 (Accelero-

grams in this volume were recorded in NW Yugoslavia during

the 1976 Friuli earthquake sequence).

Analysis of strong motion records of the Vrancea-Romania

earthquake of March 4 1977, obtained in Nis-Yugoslavia,

Publication No. 55, May, 1977.

Preliminary analysis of strong motion records obtained at

Ulcinj, Bar and Petrovac from the April 15, 1979 Monte Negro

Yugoslavia earthquake, Publication No. 64, April, 1979.

These reports contain listings and plots of the digitized accelerograms, and in some cases, response and Fourier spectra are also presented. All data reports except the most recent one list the uncorrected accelerations. The recent report lists the corrected accelerations, velocities and displacements.

The accelerograms were digitized by trained personnel at the

IEEES on a semi-automatic A-D converter SM-2. The digitization 38

rate is as high as 100 points per sec. The processing of these records appears to follow the programs developed at Caltech

(Trifunac and Lee, 1973) and in Japan with some modifications.

However, there is no published documentation on the complete details of the processing methods that were used. The eventual goal of the IEEES is to publish data reports similar in format to the Caltech data reports.

Although the relevant information on the digitized accelerogram data and generating earthquakes is fairly complete, a considerable amount of information could not be found for the recording stations. 39

3. QUALITY OF STRONG-MOTION DATA

3.1 Introduction. A study of the quality of the strong-motion

data base compiled in our tables was made. These studies:

(1) examined the completeness and uncertainties in the data

pertaining to the recording conditions, and 2 considered

deficiencies or errors in the digitization and processing of

the accelerograms. In depth, comprehensive investigations and

analyses to address these problems were beyond the scope of

this study. Rather, the studies reported herein are surveys of

the quality of the strong-motion data based mostly on the

information contained in the available literature and discus-

sion with leading authorities.

3.2 Completeness of Strong-Motion Data Base. The completeness

of inf ormation pertaining to the characteristics of any particu-

lar accelerogram and its recording conditions can be easily determined by examining the data tables. The completeness of

the data varies considerably, and some general observations have been given for each country in the previous sections.

Our overall impression is that a significant amount of informa-

tion has never been documented in the literature. In some cases

the missing information probably exists, but not from readily available sources (published or unpublished), and in other cases, such as earthquake source parameters, it has never been determined. of course, some information may have been published

in available sources we were not aware of; however, we suspect 40

that this represents a small percenetage of the total missing information.

3.3 Uncertainties in Some Relevant Parameters. In instances where information on the accelerograms, recording stations, and earthquakes is available, it is important to know the uncertainty, if any, of this information. Some studies (e.g. Bolt,

1978) have shown that a consideration of the uncertainty in the independent variables in linear regression analyses can lead to results quite different from those obtained from commonly performed regression analyses in ground motion studies where the uncertainty is not included. Little research has been done on the uncertainties that are associated with many of the ground motion parameters.

An indication of the uncertainty of the reported values of some of the relevant parameters can be seen in our tables for some of the data. Uncertainties in parameters appearing in the tables basically reflect: (1) differences of opinion or possibly mis- prints which could not be resolved, 2 different methods or assumptions used to obtain the values of these parameters, and

(3) standard deviations of parameters as indicated by the computational procedures. With regard to (1) we did not attempt to make any judgements as to which author's opinion was superior in cases where some doubt existed. In many instances the basis of the person's opinion could not be determined. In others the origin of their opinions were clear, but the limited knowledge of the data on which the opinions were based permitted alter- 4

native interpretations. For these cases all reasonable values have been tabulated. Treatment of item 2 is similar to (1);

i.e. different values were reported for a particular parameter

if details of the computational method, assumptions or their validity were in doubt. The standard deviations mentioned in item 3 apply only to hypocentral coordinates, and are the result of the least-squares procedure for determining earthquake locations. These standard deviations are strongly related to the quality of raw data and earath models used, but only loosely related to the actual accuracy of the location.

Many of the parameters have only one value listed, and this situation does not necessarily imply that there is no uncertainty associated with the value, but rather, the uncertainty is unknown. Any realistic assessment of the uncertainty should be made on a case by case basis. This level of investigation was beyond the scope of this study. However, some very general observations on the uncertainties associated with some seismological parameters can be made (see subsection 34 below).

3.4 Quality of the Seismological Data. The seismological data in the Earthquake tables has been compiled primarily from standard catalog sources such as International Seismological

Centre, U.S. Government agencies (USGS, USC&GS, NOAA), Japanese

Meteorological Agency (JMA), Berkeley Seismographic Station, and the Seismological Laboratory at Caltech. A significant portion of the data has also come from research papers in the seismological literature. The literature review for this 4 2

project was extensive, but not exhaustive because many of the seismological parameters can appear in an extremely broad range of contexts. Undoubtedly, some of the blanks in the tables could be filled in eventually from published data. Estimates of the accuracy of the parameters can only be approximate because earthquakes are a complex and variable process, occur

in many different locations relative to seismographic stationst and are analyzed by many different investigators. Only very broad statements can be made, and each earthquake should be considered separately if greater detail is important.

Location Coordinates

Latitude, longitude, depth and origin time are not always

independently determined parameters. The most reliable locations result when an earthquake is surrounded by observing stations and is near at least one station. Few locations should be accepted as accurate to better than about km.

Shocks occurring within local networks can have better accuracy;

those occuring off-shore are usually much worse. Even in a given area, recent shocks are often better located than older ones because additional seismograph stations are operating.

Standard deviations from least-squares procedures were pub-

lished in the Bulletin of the International Seismological

Centre (BISC) starting in 1964, and by others in recent years.

These standard deviations measure the mathematical consistency

of the observed data and seismic velocity models rather than

the true accuracy of the location estimate. Clearly, a large

standard deviation implies a poorly determined location, 4 3

but a small standard deviation can easily result from insuf-

ficient data or systematic bias.

For earthquakes of about magnitude 6 and larger (perhaps some

smaller ones too) that are recorded over a large portion of the

globe, the BISC locations should generally have precedence.

The BISC is usually the final determination and is based on the

most complete data set. Groups using local networks such as

the JMA for onshore Japan or Pasadena for southern California

may have preferred estimates for their local shocks because

locally specific travel-time tables are used. Sometimes,

special studies and geologic observations provide the best

location estimates. Many groups grade the quality of epicenter

estimates as A, B, C, D, but the criteria for grades are not

uniform. Hypocenters for small shocks are often determined

only by local agencies. The USGS, USC&GS, NOAA have usually

rounded their determinations to the nearest tenth of a degree,

but increased precision has been reported in the past few

years. The Preliminary Determination of Epicenters is in fact

preliminary, and revisions are not uncommon.

Magnitude and Intensity

A fundamental problem with magnitude estimates is the attempt

to quanitify an extremely complex phenomenon using a single number. Many different magnitude scales have been conceived using as bases: maximum amplitude on a standard instrument, short-period body waves, short-period surface waves, 20-second surface waves, 100-second surface waves, duration of shaking, 44

areal extent of intensity, seismic moment, and others. Most of

these methods measure earthquake size based on only one part of

the total energy spectrum. Each method is meant to be roughly

comparable to others, at least at some tie point. Each method

also has its difficulties because of factors such as azimuthal

radiation pattern for the type of waves measured, lateral

variations in attenuation rates used to account for distance,

spectral saturation above some magnitude, and response proper-

ties of the earths crust at both the earthquake source and the

seismographic station.

For earthquakes listed in the tables, four widely used magni-

tude types were considered: local magnitude (ML), body-wave magnitude (Mb), surface-wave magnitude (Ms), and JMA magnitude

(Mj). None of these magnitude scales should be preferred

over the others, because they each measure the seismic spec-

trum somewhat differently.

When several stations of the same network are used to determine magnitudes, variation of a few tenths is common, and an average magnitude is assigned. The Earthquake tables also show that a

variation of a few tenths often occurs between reporting

agencies. Systematic differences also occur: Mb reported by

USGS/NOAA was lower by a few tenths than values from other

groups during the 1960's (perhaps longer).

Intensity is meant to provide a measure of the damaging effects

of earthquakes. Intensity values depend on subjective field

observations of the integrated effects of the total duration of 45

ground motion. Local construction practices must be compared to those implied in the definitions of intensity levels.

Population response must also be judged in light of peoples' familiarity with earthquakes.

Maximum observed intensities may be less than the potential epicentral intensity when epicenters are away from populated areas or offshore. Often maximum intensities are based on only a few spectacular, perhaps anomalous, effects rather than average effects. For all of the above reasons, the uncertainty could be on the order of one intensity level, and intensity values should be used with caution.

Source Dimensions

The size of a fault rupture surface is measured in several ways, each with its own level of confidence. Direct observation of surface rupture is possible for some shocks. In

California and similar locales, the surface length of moderate and larger (M>6), strike-slip earthquakes probably measures rupture length to about 10 km. The width is assumed on the basis of the limited distribution of hypocenter depths. Japan has many deeper hypocenters for which only a small part of the fault rupture may reach the surface. For all types of faulting, the distriution of early aftershock hypocenters is often assumed to indicate the extent of the mainshock rupture. Here too, the dimensions may be uncertain by 30 to 50% for small shocks and less for large shocks. When a radius is reported for small shocks, it has been calculated from source theory 46

source theory as an equivalent radius for the rupture area, and the uncertainty can be a factor of 2 or 3 Areas are computed from other parameters rather than being independently measured.

Source Parameters and Rupture Characteristics

The estimates of seismic moment, stres-s drop, source radius, particle dislacement, particle velocity, and rupture direction can be made on the basis of source theory models of the faulting process. Spectral characteristics of the radiated seismic energy are the measured quantities used. Estimates are uncertain by factors up to 2 or 3 because the theory is approximate and the observed spectra are affected by radiation pattern, path effects, crustal structure at the source and receiver, and instrument response.

Direct field observation of surface faulting provides accurate values for strike, dip, and the type of faulting. Some surface ruptures vary significantly in strike and dip along their extent. Many of the earthquakes in the tables did not rupture the surface.

For many shocks whose rupture surface cannot be observed directly, focal mechanism solutions can indicate the attitude of the fault and the type of movement. However, the technique yields two conjugate solutions, and the correct solution must be selected using geologic information. The JMA has reported both solutions, and we have duplicated these without attempts at selection. The accuracy of focal mechanism solutions can vary greatly depending on the number of observing stations and 47

their distribution relative to the earthquake hypocenter.

Well-constrained solutions may have uncertainties of only a few

degrees; poorly constrained solutions may be completely mislead-

ing. Each earthquake solution should be checked individually

if the uncertainty of fault attitudes is important.

3.5 Digitization and Processing Errors. The United States and

Japan are the only countries to publish information on digitiza-

tion and processing errors for their accelerograms. organiza-

tions in Italy and Yugoslavia are conducting research in this area but little has been published. Other countries which digitize and process their accelerograms have not performed much research, if any, but there are indications that certain countries, such as New Zealand, may be beginning programs to study these errors in the near future.

The Earthquake Engineering Research Laboratory (EERL at

Caltech conducted comprehensive studies in the late 1960's and early 1970's on the digitization and processing errors that may be present in the western U.S. accelerogram data processed by the EERL and published in their data reports (Hudson and others, 1969-1975). A concise report on the results of these studies can be found in a recent book by Professor D. E. Hudson

(1979). A more detailed discussion of the errors can be found in some of the references cited on pages 74-76 of Hudson's book, e.g. Trifunac and others 1971), Trifunac 1970), and Trifunac and Hudson 1970) .

Since the publication of the Caltech data reports, research on digitization and processing errors and improved methods for 48

processing the data to minimize these errors has been continued at the Seismic Engineering Branch (SEB) of the U.S. Geological

Survey (USGS) and the University of Southern California (USC).

Dr. A. G. Brady and coworkers at the SEB have recently published a new method to correct strong-motion records for long-period errors (Basili and Brady, 1978) and are routinely using this method to process accelerograms appearing in SEB Open-File data reports. In related work, Professor M. D. Trifunac has studied long-period digitization noise that was likely present in many of the accelerograms processed for the Caltech data reports

(Trifunac, 1977). As a result of that study, Trifunac and Lee

(1978) reprocessed those accelerograms which contained a significant amount of long-period error and have sent a magnetic tape of these reprocessed data to the SEB. Figure 31 illustrates the differences between an accelerogram corrected both by Caltech and more recently by Trifunac and Lee. The long-period motions, which are mostly digitization noise, have been eliminated by Trifunac and Lee, and this effect is most obvious in the displacement-time history. Differences in the response spectra of the two accelerograms also are considerable at the longer periods as shown in Figure 32. Generally, the accelerograms reprocessed by Trifunac and Lee were of short duration and/or small amplitude. The use of these reprocessed records over the original Caltech records is preferred for future studes. Maximum accelerations, velocities, and displacements of the reprocessed records have been included in the

Digitized Accelerogram tables. 49

At the request of Lawrence Livermore Laboratory we investigated

whether there were significant high-frequency errors in the

western U.S. accelerogram data. We could not uncover any

evidence, either from leading authorities or the literature,

that would suggest any serious-high-frequency, digitization or

processing errors in these data.

Comparisons of errors in digitization and processing methods

were possible, to a limited extent, between Japanese and U.S.

accelerogram data. An analysis of digitization errors has been

recently published by Japan's Port and Harbour Research Insti-

tute (PHRI, 1978a). The Fourier spectra of the noise present

in one record and a fixed trace that the PHRI repeatedly digi-

tized is shown in Figure 33, along with the average, zero-

damped response spectrum of noise obtained by Trifunac 1977)

for the digitization of a straight line of similar duration.

This comparison, although not exact in terms of quantities compared, does indicate that the digitization errors present

in Japanese PHRI and western U.S. accelerograms are of the same order of magnitude.

A Japanese accelerogram recorded during one of the 1966 Matsu- shiro swarm earthquakes was corrected by the Japanese Strong

Earthquake Motion Observation Center at the Earthquake Research

Institute, University of Tokyo (SEMOC, 1976). We corrected the same accelerogram with the computer program currently used by the SEB which is an upgraded version of Caltech programs developed by Trifunac and Lee 1973). The purpose of this excercise 50

was to compare the results from the application of two correction methods to see if significant differences existed. Exact details of the Japanese methods used to correct the accelerogram were not documented; however, the SEMOC 1976) reference did mention that instrument and baseline corrections were performed. The Japanese used a cosine-tapered rectangle as the band-pass filter and listed the cutoff and termination frequencies at both ends (SEMOC, 1976). The uncorrected and Japanese corrected version of the Matsushiro earthquake accelerogram are shown in Figure 34. The time increment between successive points is 0.01 sec on both plots. The corresponding response spectra of these two records (Figure 35) shows the effect of the corrections at short and long periods. Most of the increase at short periods is due primarily to the instrument correction while the decrease at long periods is due to the filtering.

The same values for the band-pass filter were used in the SEB computer program which ordinarily decimates the accelerogram data to equal time increments of 002 sec during the correction process. The corrected Matsushiro acceleration, velocity and displacement record is shown in Figure 36. The response spectra of this record and the Japanese corrected version are shown in Figure 37. The SEB response spectrum is lower than

the Japanese spectrum at both the short and long periods. The

record was reprocessed again using the same SEB program, but was decimated to increments of 0.01 sec. The corrected accelerogram (Figure 38) is now richer in higher frequencies and is 51

quite similar to the Japanese corrected version (Figure 34).

The corresponding response spectra (Figure 39) are now virtu- ally identical except at the long periods.

The above comparisons suggest that at least one Japanese correction program and the commonly used U.S. program produce about the same results over most of the period range when the same decimation is used. The appropriate decimation depends in part on the type of recording instrument and method of digitization.

51a

CORRECTED ACCELEROGRAM F102, COMPONENT N90E

CIT ORIGINAL CORRECTION USC REVISED CORRECTION (HUDSON AND OTHERS, 1969-1975) (TRIFUNAC AND LEE, 1978)

Z.;

S'. o .0 OD 00 5'.00 lb.00

'O.OO E 00 I Go .00 S.Oo lb.00

0.00 5 00 O 00 'a. o S.00 10.00 TIME - SEC TIME SEC

ORO PROJECT N 79-224

BAND-PASS FILTER FREQUENCIES L L L

CIT ORIGINAL: 005-0.07 AND 25.-27. CPS COMPARISON OF ACCELEROGRAM USC REVISED: 0.70-1 .0 AND 25.-27. CPS CORRECTED BY CIT AND USC

.4-80 FIGURE 31 51b

400

0, 200

RESPONSE SPECTRA I . 't" -,e ,

80 80 ACCELEROGRAM F102 0C COMPONENT NHE-' Gj

LL.J

4 4

v `1 v

PROJECT HO 79-224 USC REVISED CORRECTION CIT ORIGINAL CORRECTION RESPONSE SPECTRA OF ACCELEROGRAM CORRECTED BY CIT AND USC 4-80 FIGURE 32 51c

1.0-

00-00, .2 -

.8 1 2 3 4 6 8 10 20 PERIOD (SECONDS)

(j) FOURIER SPECTRUM OF DIGITIZATION NOISE IN JAPANESE PRI ACCELEROGRAM v.-125 (PHRI TECHNICAL NOTE NO 286) NS COMPONENT- ...... FIXED STRAIGHT-LINE TRACE DURATION =12.5 SECONDS

AVERAGE NOISE, DAMPED PSEUDOVELOCITY SPECTRUM FROM STRAIGHT-LINE DIGITIZATION (TRIFUNAC, 1977), DURATION =15 SECONDS

PROACT NO 79-224

L L L

COMPARISON OF IGITIZATION NOISE FOR JAPANESE AND U.S. ACCELEROGRAMS 4-00 FIGURE 33 51d

JAPANESE UNCORRECTED ACCELEROGRAM HOSHINA-A, EW COMPONENT

Z9C)

CD-

Cc WC, uj CD c ui ci

ccC, 9 1 161.00 1'.00 2'.00 3' 00 4'. 00 5'.00 6'.00 7'. 00 8'.00 9'.00 ib.oo TIME (SEC.)

JAPANESE CORRECTED ACCELEROGRAM HOSHINA-A, EW COMPONENT

M Z9 cr ujoWC, -iujc- u crC3L)

go 1'.00 2'.00 3'.00 4'.00 5' 00 6'.00 7'.00 8'.00 9'.OD lb-oo IME (SEC.)

R JECT No 79-224

L L L

UNCORRECTED AND CORRECTED ACCELEROGRAM PROCESSED BY JAPAN'S SEMOC

,4-80 FIGURE 341 5le

400 T _T_ 400

200 C) 200

100 00 100

80 80

60 6 0

40 40

2 0 20

I 0 I

Q 6 X, V 0U 4 se f 4

LLJ

2 0 6 2 o X\ 4I

8 0 6

4 A

2 X 2

DAMPING"

04 06 .4 6 8 2 4 6 8 I(; 20 PERIOD (secs)

PROJECT NO 79-224 an CORRECTED L L L

UNCORRECTED RESPONSE SPECTRA OF UNCORRECTED AND CORRECTED HOSKINA-A (EW) ACCELEROGRAM PROCESSED BY JAPAN*S SEMOC 14-80 F I GURE 35 51f

CORRECTED ACCELEROGRAM HOSHINA-A. EW COMPONENT

C-13

cc Q:, LUC -i Lu u ci rr

'4.00 1'.00 2'. 00 00 4'. 00 5'. 00 6'.00 7'.00 8'.00 !;-00 l'o Do

L'i

-c?

c, ug CD -j2-

00 2'.00 3'.00 4'.00 5'.00 6'.00 7' 00 8'.00 9'.00 ib cyo

u zm uc;- u cr -ig

17 00 I .00 2'.00 3'. 00 4'. 00 5'.00 6' 00 7'.00 8'.00 9'. 00 ib-oo T ! ME (SEC.)

PROJECT NO 79-224

L L L HOSHINA-A (EW) ACCELEROGRAM CORRECTED USING USGS SEB COMPUTER PROGRAM WITH DECIMATION TO At =0.02 SEC. 4-80 FIGURE 34 51g

400 T - 400

200 6- 00 200

C'p 900

100 100

80 80 60 60

Vo 40 40

20 20

I o 10 c 8 6

0 4 se 4

LLJ t > 2 2 ol

.4 4 0

2 2

5% DAN 04 06 i 2 .4 6 8 1 2 4 6 8 10 20 PERIOD (secs)

JAPANESE (SEMOC) CORRECTION =no PROJECT N 79-224 (At=0.01 SEC) L L L

FUGRO CORRECTION USING RESPONSE SPECTRA OF HOSHINA-A (EW) USGS SEB COMPUTER PROGRAM ACCELEROGRAM CORRECTED WITH SEMOC AND (At=0.02 SEC) ILISGS SEB PROCEDURES

14-80 FIGURE 371 51h

9- CORRECTED ACCELEROGRAM HOSHINA-A, EW COMPONENT

crci

6.00 1.00 2' 00 3'. 0 4 0 0 5 .00 6'.00 7'.00 8'.00 9'.00 lb-00

0 9 0-

uo- LLJ U)

LLJ

0 .00 + 0 2'. 00 3'.00 4'. 00 5 00 6.00 7 00 8.00 9 .00 ib-oo

Z wc;- cr -ig nl_a- SI

.6i.00 1'.00 2'. 00 3'. 00 4 00 S.00 6 T 00 7 T00 B.00 9.00 .00 TIME (SEC.)

OJEC No 79-224 an L L L HOSHINA-A (EW) ACCELEROGRAN CORRECTED USING USGS SEB COMPUTER PROGRAM WITH ECIMATION TO At=0-01 SEC.

.4-80 FIGURE 38 51i

400 X\ 7 400

200 X, 200 0

900

'01 100 100

80 80

60 60 V 40 40

4 20 20

10 10 c 8

4 4 0

Lli > 2

8 4, X

X \41 2 2

//% DAMPING

04 06 H 4 2 8 P I D (secs)

JAPANESE (SEMOC) CORRECTION Ono PROJECT NO 79-224 At =.01 SEC) L L L FUGRO CORRECTION USING RESPONSE SPECTRA OF HOSHINA-A (EW) USGS SEB COMPUTER PROGRAM ACCELEROGRAM CORRECTED WITH SEMOC AND At = . 01 SEC) USGS SEB PROCEDURES

4-80 FIGURE 39 52

4. REFERENCES CITED IN REPORT

Alonso, L., Espinosa, J. M., Mora, I., Muria, D., Prince, J., 1979, Informe preliminar sobre el sismo del 14 de Mayo de 1979 cerca de la costa de Guerrero, Parte A, Informe IPS-5, Instituto de Ingeniera, Ciudad Universitaria, Mexico City, March.

Ambraseys, N. N., 19.78, Preliminary analysis of European strong motion data 1965-1978, Part II, Bull. EAEE, v. 4 pp. 17-37.

Basili, M., and Brady, A. G., 1978, Low frequency filtering and the selection of limits for accelerogram corrections: Proceedings, 6th European Conference of Earthquake Engi- neering, Dubrovnik, Yugoslavia.

Bolt, B. A., 1978, Incomplete formulation of the regression of earthquake magnitude with surface fault rupture length: Geology, v. 6 April, pp. 233-235.

Bolt, B. A. and Cloud, W. K., 1974, Recorded strong-motion on the Hsinfengkiang Dam, China: Bull. Seism. Soc. Am., v. 64, n 4 pp. 1337-1342.

Brady, A. G., 1966, Studies of response to earthquake ground motion, EERL, California Institute of Technology.

Brady, A. G., 1969, Uncorrected digitized data - earthquake ground accelerations: in Strong motion earthquake accelerograms, Volume I, Part KTEERL, Caltech, July, pp. 611.

BRI (Building Research Institute), 1978, Digitized data of strong-motion earthquake accelerograms in Romania (March 4, 1977): Kenchiku Kenkyu Shiriyo, Ministry of Construction, Japan, n. 20, January.

CDMG (California Division of Mines and Geology), 1979, Pro- cessed data from the partial strong-motion records of the Santa Barbara earthquake of 13 August 1978, Preliminary results, Preliminary Report 23, 93 p.

CNEN-ENEL, 1976, Contribution to the study of the Friuli earthquake of May 1976, November, 135 p.

Denham, D. and Small, R. G., 1971, Strong Motion Data Centre, Bureau of Mineral Resources, Canberra: Bull. New Zealand Soc. for Earthq. Eng., v. 4 n. 1, March.

EERI (Earthquake Engineering Research Institute), 1973, Managua, Nicaragua earthquake of December 23, 1972: EERI Conf. Proc., V. I and II, San Francisco, November. 53

EERI (Earthquake Engineering Research Institute), 1973, Managua, Nicaragua earthquake of December 23, 1973, EERI Reconnais- sance report, May, 214 p.

Espinosa, J. M., Alonso, L., Mora, I., Cajiga, J., Prince, J., 1978, Informe preliminar sobre los sismos del 29 de Noviembre de 1978 en el estado de Oaxaca, Informe IPS-4, Instituto de Ingenieria, Ciudad Universitaria, December.

Halverson, H. T., 1971, Modern trends in strong movement (strong-motion) instrumentation: -Dynamic Waves in Civil Engineering, ed. Howells, D. A., Haiag, I. P., Taylor, C., Wiley Interscience, London.

Hefford, R. T., Randal, P. M., Skinner, R. I., Beck, J. L., and Tyler, R. C., 1979, The New Zealand strong motion earthquake recorder network: Bull. New Zealand Nat. Soc. Earthq. Eng., v. 12, n 3 September, pp. 256-261.

Herrmann, R. B., 1977, Analysis of strong motion data from the New Madrid seismic zone: 1975-1976: Dept. of Earth and Atmosph. Sciences, Saint Louis University, August, 144 p.

Hodder, S. B., Skinner, R. I., Hefford, R. T., and Randal, P. M., 1978, Strong motion records of the Milford Sound earthquake 1976 May 4 Bull. New Zealand Nat. Soc. Earthq. Eng., v. 11, n 3 September.

Huaco., D. and Rodriguez, A., 1979, The acceleration of Arequipa earthquake, February 16, 1979: Earthquake Notes, Eastern Secton, SSA, v. 49, n 4 p. 16-17.

Hudson, D. E., 1970, Ground motion measurements, Chapt. 6 of Earthquake Engineering, ed: Wiegel, Prentice-Hall, p. 117.

Hudson, D. E., 1979, Reading and Interpreting Strong Motion Accelero2rams, EERI, 112 p.

Hudson, D. E., Trifunac, M. D., Brady, A. G., Nigam, N. C., Vijayarghavan, A., and Udwadia, F. E., 1969-1975, Analysis of strong motion earthquake accelerograms, California Institute of Technology, Volumes I - IV, Parts A-Y.

Husid, R., 1973, Earthquakes, Spectral analysis as a basis of earthquake resistant design, Editorial Andres Bello, Santiago, Chile.

Jennings, P. C., 1962, Velocity spectra of Mexican earthquakes of 11 May and 19 May 1962, EERL, California Institute of Technology.

Murphy, J. R. and O'Brien, L. J., 1978, Analysis of a world- wide strong motion data sample to develop an improved correlation between peak acceleration, seismic intensity and other phpysical parameters: NUREG-0402, Comupter Sciences Corporation for U.S. Nuclear Regulatory Commission.* 54

NAS (National Academy of Science), 1975, Engineering report on the Managua earthquake of 23 December,.1972: National Research Council, 111 p.

NAS (National Academy of Science), 1980, Earthquake engineering and hazards reduction in China, ed. P. C. Jennings, CSCPRC Report No. 8, Washington D.C.

OASES (Offshore Alaska Seismic Exposure Study), 1978, report prepared for Alaska Subarctic Offshore Committee by Woodward Clyde Consultants, March.

PHRI (Port and Harbour Research Institute), 1975, Annual report on strong-motion earthquake records in Japanese ports (1974), Technical Note No. 202, March, 124 p.

PHRI (Port and Harbour Research Institute), 1978a, Digitization and corrections of strong-motion accelerograms, Technical Note No. 286; March, 56 p.

PHRI (Port and Harbour Research Institute), 1978b, Annual report on strong motion earthquake recors in Japanese ports 1976 and 1977), Technical Note No. 287, March, 194 p.

Pletnev, K. G., Shebalin, N. V. and Shteinberg, V. V., 1977, Strong-motion records from the May 1976 Gazli, U.S.S.R. earthquakes, report appearing in: Circular 762-A, USGS Seismic Engineering Program Report, January-April 1977, 28 p.

Psycharis, I., 1978, The Salonica (Thessaloniki) earthquake of June 20, 1978, EERL 78-03, California Institute of Technol- ogy, October, 28 p.

Rojahn, C., Perez, V., Castano, J. C., and Zamarbide, J. L., 1980, Strong-motion records from the November 23, 1977 San Juan, Argentina main shock and December 6 1977 aftershock, draft report, to be published as a contribution to a USGS professional paper.

SEMOC (Strong Earthquake Motion Observation Center), 1976, Digital data of the strong-motion earthquake accelerograms in Matsushiro earthquake swarm area, ERI, Univ. of Tokyo, April, 157 p.

SMEOC (Strong Motion Earthquake observation Council), 1978, Strong-motion earthquake records in Japan, 1976, v. 21, publ. by Nat. Res. Center Disaster Prev., Science and Technology Agency, March, 72 p.

Trifunac, M. D., 1970, Low frequency digitization errors and a new method for zero baseline correction of strong-motion accelerograms, EERL 70-07, Caltech, September, 55 p. 55

Trifunac, M. D., 1977, Uniformly processed strong earthquake ground accelerations in the western United States of America for the period from 1933 to 1971: pseudo relative velocity spectra and processing noise, CE 77-04,.USC, September, 219 p.

Trifunac, M. D. and Hudson, D. E., 1970, Laboratory evaluations and instrument corrections of strong-motion accelerographs, EERL 70-04, Caltech, August, 113 p.,

Trifunac, M. D., and Lee, V., 1973, Routine computer processing of strong-motion accelerograms: California Institute of Technology, EERL Report No. 73-03, 360 p.

Trifunac, M. D. and Lee, V. W., 1978, Uniformly processed strong earthquake ground accelerations in the western United States of America for the period from 1933 to 1971: corrected acceleration, velocity and displacement curves, CE 78-01, USC, February, 220 p.

Trifunac, M. D., Udwadia, F. E., Brady, A. G., 1971, High frequency errors and instrument corrections of strong-motion accelerograms, EERL 71-05, Caltech, July, 47 p.

USGS (U.S. Geological Survey), 1976, 1971 records, strong- motion' earthquake accelerograms, digitization and analysis: Seismic engineering data report, Open-File Report 76-609, July, 117 p.

USGS (U.S. Geological Survey), 1977a, Records from Lima, Peru: 1951 to 1974, Strong-motion earthquake accelerograms, digitization and analysis: Seismic Engineering data report, Open-File Report 77-587, April, 159 p.

USGS (U.S. Geological Survey), 1977b, Western hemisphere strong- motion accelerograph station list-1976, Open File Report No. 77-374, May, 112 p.

USGS (U.S. Geological Survey), 1978a, 1972 records, strong- motion earthquake accelerograms, digitization and analysis: Seismic engineering data report, Open-File Report 78-941, October, 128 p.

USGS (United States Geological Survey), 1978b, Romanian and Greek Records, 1972-77, Seismic engineering data report, Open-File Report 78-1022, September, 221 p.

Zaevaert, L., 1964, Strong ground motion recorded during earthquakes of the llth and 19th, 1962 in Mexico City, Bull. Seism. Soc. M., v. 54, n. 1, pp. 209-232.

*Available for purchase from the NRC/GP0 Sales Program, U.S. Nuclear Regulatory Commission, Washington, DC 20555, and the National Technical Information Service, Springfield, VA 22161. 56

APPENDIX

A. STRONG-MOTION DATA CATALOG

A.1 Introduction

This appendix describes the types of information listed in the strong-motion data catalog and instructs potential users on how to read it and obtain desired information.

Appendix A is organized as follows. A description of the catalog and users guide is presented in Subsection A.2.

Subsection A.3 is a legend of all abbreviations used in the catalog, and Subsection A.4 is a list of references cited in the catalog.

A.2 Description of Catalog and Users Guide

Information pertaining to each accelerogram documented in the catalog has been entered in three tables: (1) Digitized Accel- erogram 2 Recording Station, and 3 Earthquake. The kinds of information appearing in each of these tables is listed below:

(1) Digitized Accelerogram

o Date and time of earthquake

0 Location and I.D. number of recording station

0 Source, I.D. number, and digitized length of accelerogram

o Earthquake magnitude and site intensity

o Source-site distances (epicentral, hypocentral,

closest approach, center of energy release)

o Amount and type of accelerogram processing 57

o Accelerogram characteristics (uncorrected peak accelera-

tion, corrected peak acceleration, velocity and displace-

ment, and RMS acceleration)

(2) Recording Station

0 Location, coordinates, and I.D.-number

o Structure housing instrument (size and type)

o Type of instrument and location within structure

o Local geology (description and classification)

(3) Earthquake

o Date and time

o Location description and hypocentral coordinates

(including location uncertainty)

o Magnitudes (MLF MSf MJMAI Mb)

o Maximum intensity

0 Source dimensions (length, width, radius, area)

0 Seismic moment and stress drop

0 Source rupture characteristics (fault type, strike, dip,

displacement, slip and rupture directions, rupture

velocity).

The catalog has been organized by country. The section of the catalog for each country contains the three tables discussed above. User information necessary to read the tables is given below.

Information printed at the top of each page is heading data.

The entries beneath the headings are the corresponding data. 58

The headings are generally self-explanatory; however, explana- tions of some headings are presented below to eliminate any possible misunderstandings.

Digitized Accelerogram Table

Heading Explanation

DATE Earthquake date: year (YR), month (MO), day (DA) YRMODA and time: hour (H), minute (M), origin (0). TIME H M 0

STATN Recording Station I.D. Number. Note: USGS I.D. NO numbers are used for western hemisphere stations

MAGNITUDE Earthquake Magnitude. STA INTENSITY Intensity at recording station. SOURCE-STATN Distances from earthquake source to recording DISTANCES-KM station in km.

Notes: In the table a letter code usually is printed after the magnitude and intensity to denote the scales used. Distances used are epicentral, hypocentral, closest approach, and center of energy release. Two values of any parameter are allowed per line.

REF References. Note: All numbers in parenthesis ( ) refer to references or notes cited in subsection A.4

ACCELEROGRAM NO is the accelerogram I.D. number and the first NO CORR two lines are allocated to print this information. DISTR DISTR is the source where the digitized accelerogram can be obtained. CORR is the amount of processing of the accelerogram.

COMP Accelerogram component.

TIME Digitized length of accelerogram component in sec. DUR. (SEC)

MAX Maximum uncorrected acceleration in units of UNCOR gravity. ACCEL (G)

RMS Root-mean-square accelertion in units of ACCEL gravity/10. G/10 59

Recording Station Table

Heading Explanation

STATN Recording station I.D. number. NO Note: This number is identical to the one used in the Digitized Accelerogram table to permit cross-referencing.

STATION Note: Names are identical to those used in LOCATION Digitized Accelerogram table to permit cross- referencing.

COORDS. Lattitude and longitude of recording station. LAT. LONG.

STRUCTURE Information on the structure housing the recording INFORMATION instrument.

INSTR. The instrument type (printed on first line) and TYPE location within structure. LOC.

CLASS Classification of local geology according to reference cited.

Earthquake Table

Heading Explanaton

STD. Standard deviation from least squares estimated DEV. of hypocentral location.

LAND/ Location of hypocenter (land or ocean). OCEAN Note: In instances where LAND or OCEAN was not printed under the intensity scale in the table means that the epicenter was near the coast.

RAD. -KM Equivalent radius of earthquake source in km.

AREA -SK Area of earthquake source in sq. km.

MOMENT Seismic moment in dyne-cm.

DISP.-M Fault-rupture dislacement in meters.

VEL-KPS Fault-rupture velocity in km /sec.

S.DIR Direction of slip (displacement).

V.DIR Direction of fault-rupture velocity. 60

The Digitized Accelerogram and Earthquake tables are organized for each country in chronological order. In the Digitized

Accelerogram table for the United States, records from the same earthquake are placed in ascending order according to station number. The Japanese records for the same event are lumped together by agency.

Generally, stations are placed in alphabetic order within the

Recording Station table. U.S. stations are ordered in a manner similar to the USGS strong-motion station list for the U.S.

(USGS, 1977b), i.e. alphabetically by state, city, and address.

Japanese stations are ordered from north to south by district.

Data printed next to STORY in the body of Recording Station table under the heading STRUCTURE INFORMATION appears in the format x/y, where x and y are the number of stories above and below ground level, respectively.

Any number appearing in parentheses next to data within the tables refers to a reference cited in subsection A.4 where that data was obta.ined. In some cases ) are used in place of data, which means a detailed explanation was required which can be found in A.4. 61

A.3 Abbreviations Used in Catalog

Abbreviations used in the Digitized Accelerogram, Recording

Station and Earthquake tables are given on the following pages. 62

A.3.1 Abbreviations Used in Digitized Accelerogram Tables

C Mercalli-Cancani-Sieberg Intensity Scale.

CA Closest approach distance, km.

CDMG California Division of Mines and Geology.

CDUV Ciudad Universitaria, Instituto de Ingenieria, Mexico.

CIT California Institute of Technology, routine computer programs for processing of accelerograms, volumes I-II (see Trifunac and Lee, 1973, reference cited in report).

CIT/A California Institute of Technology, Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Volume I-II, Part A. Data reports published by Earthquake Engineering Research Laboratory (Similar abbreviations for Parts B, C, D, etc.).

CIT/ California Institute of Technology, Earthquake Engi- EERL neering Research Laboratory.

CNEN- Strong Motion Earthquake Accelerograms, Digitized ENEL/ and Plotted Data, Uncorrected Accelerograms, Part PT1 Data reports published by CNEN-ENEL, Rome, Italy.

CR= Center of energy release distance, km.

DSMA/ Digitized Strong-Motion Earthquake Accelerograms JAP72 in Japan 1972. Accelerogram data book published by Wssocfation for Science Documents Information.

EDIS/ Environmental Data Information Service of the National NOAA Oceanic and Atmospheric Administration.

EP= Epicentral distance, km.

FUGRO Accelerograms processed by Fugro, Inc.

G Greenwich Mean Time.

HERR/ Herrmann, R. B., Analysis of Strong Motion Data DEAS from the New Madrid Seismic Zone: 1975-1976 (see reference cited in report).

HUSID Personal communication, Raul Husid.

HY= Hypocentral distance, km. 63

Abbreviations - Digitized Accelerogram Tables (Cont.)

J Japanese Standard Time.

J Japan Meteorological Agency Intensity Scale.

JMA Japan Meteorological Agency magnitude.

K Medvedev, Sponheuer, and Karnik Intensity Scale.

L Local time.

M Modified Mercalli Intensity Scale

MB Body-wave magnitude.

MG= Magnitude.

Mi Japan Meteorological Agency magnitude.

ML Local magnitude.

Ms Surface-wave magnitude.

PHRI/ Data reports published by the Port and Harbour 250 Research Institute, report no. 250.

PWRI/ Data reports published by the Public Works Research 876 Institute, report no. 876.

S Mercalli-Sieberg Intensity Scale.

SB Digitized data scaled to units of acceleration and time followed by parabolic baseline correction.

SCE Southern California Edison.

SEB Seismic Engineering Branch of the U.S.G.S. Processing of accelerograms, Volumes I-II.

SEB/ Seismic Engineering Branch of the U.S.G.S. with FUG Fugro, Inc. Processing of accelerograms, Volume I completed.

SEB/ Seismic Engineering Branch of the U.S.G.S., Open OF78- File Report 78-1022. 1022

SEMOC Strong Earthquake Motion Observation Center, Digital Data of the Strong Motion Earthquake Accelerograms in Matsushiro Earthquake Swarm Area (see reference cited in report). 64

Abbreviations - Digitized Accelerogram Tables (Cont.)

Si (used in ACCELEROGRAM column) Digitized data scaled to units of acceleration and time and interpolated to equal time increments.

SIBI SI followed by baseline and instrument correction.

SI= Station intensity.

USC University of Southern California, Volume II repro- cessing of CIT Volume I data.

VI Volume I processing (uncorrected accelerograms).

VIA Volume I processing with arc correction.

VIA/II VIA followed by Volume II processing similar to CIT or SEB.

VIA/SF VIA followed by Fugro, Inc. Volume II processing using SEB program.

VIA/WC VIA followed by Woodward-Clyde Consultants Volume II processing.

VIAB Volume I processing with arc correction followed with parabolic baseline correction.

VIAB/WC VIAB followed by Woodward-Clyde Consultants Volume II processing.

VIB VI followed by parabolic baseline correction.

VI-II Volume I and II processing.

WWC Woodward-Clyde Consultants.

The following abbreviations, CIT, SEB, USC, VIAB/WC, VIA/II,

VIA/SF, VIA/WC, WWC, are sometimes followed by numbers such as

0. - 07 25 - 27.

These numbers are the low and high frequency filter parameters in Hz. 65

A.3.2 Abbreviations Used in Recording Stations Tables

AB Abutment

ALLUV Alluvium

AR240 United States strong motion accelerograph AR-240

AUX AB Auxiliary abutment.

AUX DAM Auxiliary dam

BF Braced frame

BKlA Block IA

BRICK Brick construction

BSMT Basement

BlF First basement below ground floor. (Similarly B2F means second subbasement, etc.)

CGS United States Coast and Geodetic Survey's strong motion accelerograph

CONC Concrete

CONC DAM Concrete dam

CONC GRAV DAM Concrete gravity dam

CONC VAULT Concrete vault

CRA1 Kinemetrics central recording accelerograph system.

CRST Crest of dam

D Ductile

DC3C Japanese strong motion accelerograph DC3C

DHB DAM Diamond head buttress dam

DNSF 124M Downstream face, 124 meters elevation 66

Abbreviations - Recording Station Tables (Cont.)

DNST Downstream

DPCOH Deep cohesionless soil

DS Deep soil

DS/SS Dual soil classification (DS or SS). First designation in preference.

EMBK Embankment

ERS Japanese strong motion accelerograph (ERS-A, ERS-B, ERS-C)

ERTH DAM Earth dam

ERTH RES Earth reservoir

FA-SM Area of foundation, square meters

FF Ground in free-field

FL-M Length of foundation, meters

FP Flat plate

FS Foundation slab, free-field

FW-M Width of foundation, meters

GF Ground floor

GL Ground level

GLRY Gallery

GRAV DAM Gravity dam

HDRK Hard rock

HYD Hydroelectric plant or power station

INTER Intermediate (soil classification) is Instrument shelter

LAB Left abutment 67

Abbreviations - Recording Station Tables (Cont.)

LCRS Left crest

LTOE Left toe

M Meters

MDHT Mid-height

M02 New Zealand strong motion accelerograph

MR Moment-resisting

Ms Masonry

MSTA Mobile station

OUT WRK Outlet works

RAB Right abutment

RC Reinforced concrete

RC/BW Reinforced concrete - block wall

RC/CB Reinforced concrete - concrete braced frame

RC/FP Reinforced concrete - flat plate

RC/FR Reinforced concrete frame

RC/MF Reinforced concrete, moment frame

RC/MR Reinforced concrete, moment resisting

RC/RS Right crest

RC/SW Reinforced concrete shear wall

RC/T Reinforced concrete tubular structure

RDZ Chinese strong motion accelerograph RDZ 112-66 11266

RFT250 U.S. strong motion accelerograph RFT-250

RM Reinforced masonry

ROCK Rock 68

Abbreviations - Recording Station Tables (Cont.)

ROCK DAM Rock-fill dam

RTOE Right toe

SF Steel frame

SF/BR Steel frame - braced

SF/MR Steel frame - moment resisting

SF/RC Steel frame with reinforced concrete

SFRK Soft rock

SMAl U.S. strong motion accelerograph, SMA-1. Kinemetrics. (similar abbreviation for SMA-2)

SMACB Japanese strong motion accelerograph, SMAC-B (similar abbreviations for SMAC-B2, SMAC-D, etc.)

SOFT Soft to medium clay and sand

SPB Small prefabricated building

SRC Steel and reinforced concrete

Ss Stiff soil

SS/DS Dual soil classification (SS or DS). First designation is preference.

SS/R Dual soil classification (SS or R). First designation is preference.

SSRZ U.S.S.R. strong motion accelerograph

STD U.S. strong motion accelerograph. This designation includes instrument referred to as standard, USC&GS, USCGS, CGS

STIFF Stiff soil 150 feet deep

STORY Number of stories above/below ground level

SW Shear Wall

SWYD Switchyard

TNL Tunnel 69

Abbreviations - Recording Station Tables (Cont.)

TOE Toe of dam

TYPE Type of structure

UGPH 250M Underground powerhouse 250 m deep

UGTN Underground tunnel

WF Wood frame

IF First floor.

1 Japanese soil classification. Bedrock or diliuvium <10 m deep.

2 Japanese soil classification. Diluvium > 10 m deep or alluvium < 10 m deep.

3 Japanese soil classification. Alluvium < 25 m including soft layer < 5 m thick.

4 Japanese soil classification. Soft alluvium or reclaimed land.

50 GL DRUM 50 gallon drum 70

A.3.3 Abbreviations Used in Earthquake Table

Three spaces after the notation, T = in the body of the table have been allocated to code the fault type. The first space is used to indicate the predominate slip. The second space denotes the other component of slip if significant. Abbreviations for these two columns are:

D - Dextral, right lateral

- Sinistral, left lateral

N - Normal dip slip

R - Reverse dip slip

T - Thrust dip slip

The third space denotes the evidence used to estimate the fault type. Abbreviations for this are:

F Faulting at surface

M Mechanism solution

G Inferred from geologic trends

U Undifferentiated from focal mechanism solution

Abbreviations for the intensity scale can be found in Subsec- tion A.3.1. Other abbreviations used in the Earthquake tables are listed on the following page. 71

Abbreviations - Earthquake Tables (Cont.)

A= Dip

AR Area of source, km

B= Slip direction

C Mercalli-Cancani-Sieberg Intensity Scale

C= Direction of rupture velocity

D= Displacement, meters i Japan Meteorological Agency Intensity Scale

K Medvedev, Sponheuer, and Karnik Intensity Scale

K= Strike

LN= Length of source, km

M Modified Mercalli Intensity Scale

MB= Body-wave magnitude

MJ__ Japan Meterological Agency magnitude

ML= LQcal magnitude

MO= Seismic Moment, dyne-cm

MS= Surface-wave magnitude

RD= Radius of source, km

S Mercalli-Sieberg Intensity Scale

SD= Stress drop, bars

T= Fault rupture type

V= Fault rupture velocity, km/sec

WD Width of source, km 72

A.4 References Used in Catalog

References cited in the catalog are listed in this subsection by country. The countries are arranged in alphabetical order as in the catalog. With the exception of Japan and the United

States, references reported for each country are numbered sequentially beginning with (1) for the first reference in the

Digitized Accelerogram table and ending with some number less

than 100 for the last reference in the Earthquake table.

Because of the large number of references used for the Japanese and U.S. data, and because of an imposed format limiting the

reference numbers to two digits, two reference lists were constructed for these countries. The first list pertained to

the Digitized Accelerogram and Recording Station tables and the second pertained to the Earthquake table. The number of

references in the U.S. Earthquake table exceeded 100. After

reference 99) letters were used in place of numbers, i.e. (A),

(B), etc. 7 3

CATALOG REFERENCES - ARGENTINA

1. Seismic Engineering Program Rport, Sept. - Dec., 1977, USGS Circular 762-C.

2. Rojahn, C., Perez, V., Castano, J. C., and Zamarbide, J. L., Contribution to USGS Professional Paper: Strong- Motion Records from the November 23, 1977 San Juan, Argentina Main Shock, and December 6 1977 Aftershock, Preliminary Draft.

3. Chris Rojahn, United States Geological Survey.

4. 'Seismological Notes,' published in the Bulletin of the Seismological Society of America.

5. Earthquake Engineering Research Institute.

6. Earthquake Engineering Research Institute Newsletter, v. 12, n 2 March 1978, p. 23.

7. Pasadena, Seismological Laboatory, Caltech.

8. Berkeley Seismographic Station, University of California.

9. United States Geological Survey. 7 4

CATALOG REFERENCES - CHILE

1. Earthquakes, R. Husid, Spectral analysis and characteristics as a basis of earthquake resistant design, Editorial Andres Bello, Santiago, Chile, 1973.

2. Savagoni, G. R.? "Analysis de la interaccion dinamica suelo-estructural Memoria para optar al titulo de Ingeniero Civil, Universidad de Chile, 1968.

3. Husid, R., Guiloff, R., Roizen, S., "Analysis de Terremotos Chilenos y Mexicanos," Revista del IDIEM, v. 8, n 3, Dec., 1969, pp. 121-144.

4. Brady, A. G., ffStudies of response to earthquake ground motion," EERL, Caltech, 1966.

5. Berg, G. and Housner, G., "Integrated velocity and displacement of strong earthquake ground motion," BSSA, v. 51, n 2 April 1961, pp. 175-189.

6. Lepe, J. and Torres, R., 'El Pendulo de torsion en el analisis sismico," Memoria para optar el titulo de Ingeniero Civil, Universidad de Chile, 1950.

7. Offshore Alaska Seismic Exposure Study, 1978, Woodward- Clyde Consultants for ASOC., Vol II - Attenuation.

8. USGS Western Hemisphere Strong-Motion accelerograph station list - 1976, Open File Report No. 77-374.

9. Eisenberg, A., Husid, R. and Luco, J. E., 1972, "A preliminary report: The July 8, 1971 Chilean earthquake," BSSA, v. 62, n. 1, pp. 423-430.

10. Bulletin of the International Seismological Center.

11. United Stated Earthquakes, annual reports currently published by U.S. Department of Commerce (NOAA) and U.S. Department of Interior (Geological Survey).

12. National Earthquake Informatoin Center.

13. Eisenberg, A., Husid, R. and Lucco, J. E., 1972, "A Pre- liminary Report, the July 8, 1971 Chilean earthquake:" BSSA, v. 62, pp. 423-430.

14. Pasadena, Seismological Laboratory, Caltech.

15. United States Geological Survey.

16. Berkeley Seismographic Station, University of California. 75

CATALOG REFERENCES - CHINA

1. Morrison, P., Maley, R., Brady, A. G., Porcella, R., 1977, "Earthquake Recordings on or near Dams," USCOLD, Committee on Earthquakes, November.

2. Bolt, B. A. and Cloud, W. K., 1974, "Recorded Strong- Motion on the Hsinfengkiang Dam, China," BSSA, v. 64, n 4 pp. 1337-1342.

3. "Engineering Strong Ground Motion Recording Catalogue (1)" National Civil Engineering Earthquake Research Insti- tute, Peking City Ground Motion Aseismic Committee, March, 1978.

4. Computer listing given to FUGRO, Inc., by Wang Kai-shen, Institute of Structural Research, P.O. Box 7 S-2, Beijing, China.

5. Instrument is located 13 m from Yutan Guest House.

6. Station data available through Wang Kai-shen. See reference 4 for address.

7. Preliminary Determination of Epicenters, National Oceanic and Atmospheric Administration.

8. Japanese Meteorological Agency.

9. Bulletin of International Seismological Center.

10. Pasadena, Seismological Laboratory, Caltech.

11. Peking, Seismological Station.

12. Moscow, Seismological Station.

13. Berkeley Seismographic Station, University of California. 76

CATALOG REFERENCES - EL SALVADOR

1. USGS, Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms, Digitization and Analysis, 1967-1975 Records, Open File Report to be published. 77

CATALOG REFERENCES - GREECE

1. USGS, Seismic Engineering Data Report, "Romanian and Greek Records, 1972-1977", Open File Report 78-1022, 221 p.

2. CIT/EERL, 'The Salonica (Thessaloniki) Earthquake of June 20, 1978" by Ioannis Psycharis, EERL 78-03, 29 p.

3. Ambraseys, N. N., 1978, "Preliminary Analysis of European Strong Motion Data 1965-1978," Part II, Bull. EAEE, v. 4 pp. 17-37.

4. Names listed under station location are locations of epicenter, not stations. Station names and other information are not available.

5. "Seismological Notes," published in the Bulletin of the Seismological Society of America.

6. Athens Seismological Institute.

7. Pasadena, Seismological Laboratory, Caltech.

8. Earthquake Research Laboratory, USGS, San Francisco, Calif.

9. ational Earthquake Information Service, NOAA, U.S. Department of Commerce.

10. U.S. Geological Survey.

11. According to reference number (5), the intensity may reflect the cummulative damage from several shocks.

12. Moscow Seismological Station.

13. Bulletin of the International Seismological Center. 78

CATALOG REFERENCES - ITALY

1. "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Uncorrected Accelerograms, Part - Accelerograms 028 through 06411, CNEN-ENEL, Rome, Italy, July, 1976.

2. "Terremoto del Friuli, Prime registrazioni della rete di stazioni accelerometriche fisse delIENEL e delle stazioni accelerometriche molili del CNEN,` CNEN-ENEL, Roma 18 maggio 1976.

3. "Contribution to the Study of Friuli Earthquake of May 1976,- CNEN-ENEL, November, 1976.

4. "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Uncorrected Accelerograms, Part 2 - Accelerograms 065 through 119,11 CNEN-ENEL, Rome, Italy, January, 1977.

5. "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Uncorrected Accelerogams, Part 3 - Accelerograms 120 throuogh 177", CNEN-ENEL, Rome, Italy, November, 1977.

6. Ambraseys, N. N., 1978, "Preliminary Analysis of European Strong Motion Data 1965-1978," Part II, Bull. EAEE, V. 4 pp. 17-37.

7. "Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the Antiseismic Design of Nuclear Installations," Parts I, II and III, OCED-NEA/CSNI Report No. 28, May 1978.

8. Computer Sciences Corporation magnetic tape.

9. Caltech computer listing of heading data.

10. Accelerogram is band-pass filtered between these two cutoff frequencies. The width of the roll-off ramp of the box-car filter at the higher frequency is 2 cps. Information on the width of the roll-off ramp at the lower frequency is not available. Most likely the ramp intersects the frequency axis at a point which is 57 of the lower cutoff frequency. (A. G. Brady, pers. comm.).

11. "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Uncorrected Accelerograms, Part 4 - Accelerograms 178 through 239," CNEN-ENEL, Rome, Italy.

12. Bulletin of International Seismological Center. 79

CATALOG REFERENCES - ITALY (Cont.)

13. National Earthquake Information Center, NOAA, U.S. Depart- ment of Commerce.

14. "Seismological Notes," published in Bulletin of the Seismological Society of America.

15. Rome Seismologica Station.

16. Bureau Central International De Seismologie.

17. United States Earthquakes, annual reports currently published by United States Department of Commerce (NOAA) and United States Department of Interior (Geol. Survey).

18. No reference.

19. National Earthquake Information Center, NOAA, U.S. Department of Commerce.

20. Basili, M., Cagnetti, V., Polinari, S., Tinelli, G., Capunto, M., Console, R., Rovelli, A., 1978, "Estimate of seismic moment and other seismic parameters of some 1976 Friuli earthquakes," Proceedings of specialist Meeting of the 1976 Friuli Earathquake and the Anti- seismic Design of Nuclear Installations, OECD-NEA/CSNI Repqrt No. 28, v. II, pp. 387-399.

21. Moscow Seismological Station.

22. Berkeley Seismographic Station, University of California.

23. Pasadena, Seismological Laboratory, Caltech.

24. U.S. Geological Survey.

25. Trieste Seismological Station.

26. Computed from reference number 20).

27. Magnitude, as stated in reference number 6 is either ML or Mb- 28. Basili, M., Polinari, S., Tinelli, G., Berardi, R., Berenzi, A., Zonetti, L., 1978, "Strong Motion Records of Friuli Earthquake," Proc. of Spec. Meet. on the 1976 Friuli earthquakes and the antiseismic design of nuclear installations, OECD-NEA/CSNI, Report No. 28, v. II, pp. 375-386. 80

CATALOG REFERENCES - ITALY (Cont.)

29. Magnitudes from reference number 28) presumed to be local (ML)- 30. Cagnetti, V., and Pasqual V., 1979, "The earthquake Sequence in Friuli, Italy, 1976," BSSA, v. 69, p. 1797-1818.

31. Preliminary Determination of Epicenters, National Oceanic and Atmospheric Administration. 8 1

CATALOG REFERENCES - JAPAN (DA RS TABLES)

1. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 55, September, 1968.

2. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 62, December, 1968.

3. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 64, March, 1969.

4. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 80, June, 1969.

5. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 98, March, 1970.

6. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 100, June, 1970.

7. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 116, March, 1971.

8. Technical Note of the Port and Harbour Research Institute, ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 136, March, 1972.

9. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 160, March, 1973.

10. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 181, March, 1974. 2

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

11. Technical Note of the Port and Harbour Research Institute, ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 202, March, 1975.

12. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 236, March, 1976.

13. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 287, March, 1978.

14. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on ' Strong Motion Earthquake Records in Japanese Ports, No. 250, December, 1976.

15. Epicentral distance computed from epicentral coordinates listed in Port and Harbour Research Institute and station coordinates listed in reference number 30).

16. SEB/FUGRO processed. Filter parameters from Fugro files.

17. Woodward-Clyde Consultants, 1978, "Offshore Alaska Seismic Exposure Study," v. II, Attenuation.

18. Printout for PHRI accelerograms S1201 and S1210.

19. Mr. T. Iwasaki of the PWRI, unpublished list.

20. Computer Sciences Corporation computer printout: measures intensity in MMI.

21. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 317, March, 1979.

22. Woodward-Clyde Consultants' computer listing.

23. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 34, November, 1967. 83

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

24. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report o Strong Motion Earthquake Records in Japanese Ports, No. 156, March, 1973.

25. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 107, December, 1970.

26. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 298, June, 1978.

27. Blank spaces for the maximum displacement mean the values are less than 0.05 cm.

28. The uncorrected accelerograms were processed twice, once using a fixed filter for the low frequency corrections and again using a variable filter. The resulting peak values for the fixed-filter corrections are shown first and the variable-filter corrections are shown below. See reference 13) for details.

29. JMA Catalog of Major Earthquakes which occurred in and near Japan.

30. "Register of Observation Points for Strong-Motion Earth- quake in Japan Volumes and 2 The National Research Center for Disaster Prevention, Science and Technology Agency.

31. Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 319, June, 1979.

32. Station number AC004 represents the old location of the instrument from March 1963 to June 1969. In September 1969 the instrument was moved to a new location denoted by AC021.

33. Station number CB005 represents the old location of the instrument from March 1963 to October 1970. In October 1970 the instrument was moved to a new location denoted by CB057. 84

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

34. Station number TKO41 represents the old location of the instrument from December 1966 to March 1968 In June 1968 the instrument was moved to a new location demoted by TKO56.

35. Kashima-S (station number KTO15) represents the old location of the instrument from September 1966 to November 1971. In January 1972 the instrument was moved to a new location denoted by Kashima-ii-S (station number KTO36).

36. Shiogama-Kojyo-S (station number TH038) represents the old location of the instrument from June 1968 to October 1971. In October 1971 the instrument was moved to a new location denoted by Shiogama-Kojyo-S (station number TH033).

37. Station number CB024 represents the old location of the instrument from March 1966 to July 1971. In July 1971 the instrument was moved to a new location denoted by CB069.

38. Register of Observation Points for Strong-Motion Earth- quake in Japan, Vol. 1, The National Research Center for Disaster Prevention, Science and Technology Agency.

39. Register of observation Points for Strong-Motion Earth- quake in Japan, Vol. 2, The National Research Center for Disaster Prevention, Science and Technology Agency.

40. First location is 50 meters downstream from number 12 Pier and second location is about 4 kilometers from bridge.

41. The earthquake which produced this accelerogram was part of the Matsushiro swarm of earthquakes, but the particular shock could not be identified.

42. Strong-Motion Earthquake Observation Council, Strong- Motion Earthquake Records in Japan, 1976, v. 21, The National Research Center for Disaster Prevention, Science and Technology Agency.

43. Bore-hole Seismograph array (Type-3203 ---- ERS type). Depths of instruments were meters, 20 meters, 60 meters, and 250 meters. Coordinates were not given.

44. Computed from coordinates of the station and epicenter. The station data is from "Register of Observation Points for Strong-Motion Earthquake in Japan, Vol. and 2 and epicenter is from reference (1). 8 5

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

45. Strong Earthquake Motion Observation Center, Earthquake Research Institute, 1976, "Digital Data of the Strong- Motion Earthquake Accelerograms in Matsushiro Earthquake Swarm Area," n. 1, 157 p., April.

46. The band-pass filter has a cosine-tapered ramp. See reference 45) for details.

47. In the second set of three components, the NS and EW components were processed by Woodward-Clyde Consultants using USGS-SEB computer program. The accelerogram was band-pass filtered between 0.1-0.15 and 25.-27. cps. The vertical component was processed by FUGRO using a similar computer program and was band-pass filtered between 0.1-0.5 and 23.-25. cps.

48. In the second set of three components, the NS and EW components were processed by Woodward-Clyde Consultants using USGS-SEB computer program. The accelerogram was band-pass filtered between 017-0.25 and 25.-27. cps. The vertical component was processed by FUGRO using a similar computer program and was band-pass filtered between 005-0.25 and 23.-25. cps.

49. Katayama, T., Iwasaki, T., and Saeki,,M., 1977, "Prediction of Acceleration Response Spectra for given Earthquake Magnitude, Epicentral Distance and Site Conditions," Bull. ERS, n. 11.

50. Technical Memorandum of the Public Works Research Institute, Ministry of Construction, Japan; Revised Edition of Strong-Motion Acceleration Records (Parts 13), v. 876, December, 1973.

51. Technical Memorandum of the Public Works Research Institute, Ministry of Construction, Japan; Revised Edition of Strong-Motion Acceleration Records (Part 4, v. 877, December, 1973.

52. Technical Memorandum of the Public Works Research Institute, Ministry of Construction, Japan; Revised Edition of Strong-Motion Acceleration Records (Part 5), n. 1072, December, 1975.

53. Kuribayaski, E., and Iwasaki, T., 1969, "Observed Earth- quake Responses of Bridges," Proc. 4WCEE (JMA intensity).

54. Technical Notes of the Public Works Research Institute, Ministry of Construction, Japan; Strong-Motion Accelera- tion Records from Public Works in Japan, n. 1, v. 32, March, 1978. 86

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

55. Technical Note of the Public Works Research Institute, Ministry of Construction, Japan; Strong-Motion Accelera- tion Records from Public Works in Japan, n 2 v. 32, March, 1978.

56. Technical Note of the Public Works Research Institute, Ministry of Construction, Japan; Strong-Motion Accelera- tion Records from Public Works in Japan, n 2 v. 33, October, 1978.

57. Technical Memorandum of the Public Works Research Institute, Ministry of Construction, Japan; Revised Edition of Strong-Motion Acceleration Records (Part 5), n. 1072, December, 1975.

58. Technical Memorandum of the Public Works Research Institute, Ministry of Construction, Japan; Revised Edition of Strong-Motion Acceleration Records (Part 6, n. 1072, December, 1975.

59. Recording Station Information.

60. Committee for digitized Strong-Motion Earthquake Accelero- grams, 1972, Digitized Strong-Motion Earthquake Accelerogram in Japan, 733 p.

61. Strong Motion Earthquake Observation Council, National Research Center for Disaster Prevention, 1978, Strong- Motion Earthquake Records in Japan, 1976, Volume 21," 72 p., March.

62. Irregular shaped foundation.

63. At the time of the earthquake of 214/56, the building was three stories; sometime after this and before the earthquake of 7/1/68, the building was reconstructed to six stories.

64. The old station number is Niigata 701; no new station number is listed.

65. Calculated from coordinates and depths.

66. The old station number is Kanto 601-1; the new station number, either KTO03 or KTO13, could not be determined from the available information.

67. The old station number is Kanto 601-2; the new station number, either KTO03 or KTO13, could not be determined from the available information. 87

CATALOG REFERENCES - JAPAN (DA RS TABLES) (Cont.)

68. Recording Station Information (FUGRO File).

69. The second set of horizontal components were processed by Woodward-Clyde Consultants using USGS-SEB computer program. The accelerogram was band-pass filtered between 035-0.5 and 25.-27. cps.

70. The second set of horizontal components were processed by Woodward-Clyde Consultants using USGS-SEB computer program. The accelerogram was band-pass filtered between 017-0.25 and 25.-27. cps. 88

CATALOG REFERENCES - JAPAN (EQ TABLES) (Cont.)

1. Japanese Meteorological Agency, 1979, revised locations.

2. Bulletin of the International Seismological Center.

3. Japanese Meteorological Agency.

4. Committee for digitized Strong-Motion Earthquake Accelero- grams, 1972, Digitized Strong-Motion Earthquake Accelerogram n Japan, 733 p.

5. According to reference number 3 magnitude was listed as MG = 6 34-7.

6. No Reference.

7. Kaminuma, K., Iwata, T., Kano, I., and Ohtake, M., 1973, 'Summary of scientific data of major earthquakes in Japan 1872-1972," Earthquake Research Institute of University of Tokyo, Research Report No. 9 (In Japanese)

8. International Seismological Summary.

9. Abe, K., 1974, "Fault parameters determined by near and far-field data: The Wokasa Bay earthquake of March 26, 1963," BSSA, v. 64, pp. 1369-1382.

10. Kanamori, H. and Anderson, D. L., 1975, "Theoretical basis of some emperical relations in seismology," BSSA, v. 65, pp. 1073-1095.

11. Geller, R. J., 1976, "Scaling relations for earthquake source parameters and magnitudes," BSSA, v. 66, pp. 1501-1523.

12. U.S. Coast and Geodetic Survey.

13. Kanamori, H., 1978, Quantification of great earthquakes: Tectonophysics, v. 49, pp. 207-212.

14. Based on body wave data, reference 7.

15. Based on surface wave data, reference 7.

16. Based on aftershock data, reference 7.

17. Chandra, U., 1970, "Stationary phase approximation in focal mechanism determination," BSSA, v. 60, pp. 1221-1229. 89

CATALOG REFERENCES - JAPAN (EQ TABLES) (Cont.)

18. Pasadena, Seismological Laboratory, Caltech.

19. Berkeley Seismographic Station, University of California.

20. U.S. Geological Survey.

21. "Seismological Notes," published -n the Bulletin of the Seismological Society of America.

22. Mikumoto, T., M. Kato, H. Doi, Y. Wada, T. Tanaka, R. Shichi, and A. Yamamoto, 1978, 'Possibility of temporal variations in earth tidal strain amplitudes associated with major earthquakes,' in Earthquake Precursors, ed. by CKisslinger and Z. Suzuki: Japan Scientific Society Press, Tokyo, 296 p.

23. National Oceanic Survey.

24. National Earthquake Information Center, NOAA, U.S. Department of Commerce.

25. Moscow Seismological Station.

26. National Earthquake Information Center, NOAA, U.S. Depart- ment of Commerce.

27. Earthquake Research Laboratory.

28. Preliminary Determination of Epicenters.

29. Sakhalin Seismographic Station.

30. Person, W., 1979, 'Significant earthquakes of the world 1978," Earthquake Engineering Research Institute Newsletter, v. 13, n 2 pp. 43-54.

31. Shimazaki, K. and Somerville, P., 1979, "Static and dynamic parameters of the Izu-Oshima, Japan earthquakes of January 14, 1978," BSSA, v. 69, pp. 1343-1378.

32. Tsumura, K., Karahama, I., Ogino, I., and Talcahaski, M., 1970, "Seismic activities before and after the Izu-Oshima- Kinkai earthquakes of 1978," (In Japanese), Bulletin of Earthquake Research Institute, Tokyo University v. 53, pp. 675-706.

33. Technical Note of the Port and Harbour Research Institute, Ministry of Transportation, Japan; Annual Report on Strong Motion Earthquake Records in Japanese Ports, No. 319, June 1979. 90

CATALOG REFERENCES - JAPAN (EQ TABLES) (Cont.)

34. Earthquake Engineering Research Institute, Newsletter, v. 12, n 4 July, 1978.

35. Average of 7 12 - 7 34 magnitude range reported in reference number (18) .

36. Intensity IV is the maximum (not epicentral) intensity reported in reference number 7.

37. Average of VII-VIII Intensity range reported in Earth- quake Engineering Research Institute Newsletter, v. 12, n 4 July 1978, p. 12.

38. Average of 77 14 magnitude range reported by Palisades, New York, Seismograph Station.

39. Fara, H. D., 1964, "A new catalog of earthquake fault plane solutions," Bulletin of the Seismological Society of America, v. 54, pp. 1491-1517.

40. Calculated from radius.

41. Palisades, New York, Seismograph Station.

42. Kanamori, H., 1971, "Focal mechanism of the Tokachi-Oki earthquake of May 16, 1968," Tectonophysics, v. 12, pp. 113. 91

CATALOG REFERENCES - MEXICO

1. Jennings, P. C., 1962, "Velocity Spectra of the Mexican Earthquakes of 11 May and 19 May 1962," EERL,. Caltech, December.

2. Zeevaert, L., 1964, "Strong Ground Motions recorded during earthquakes of the llth and 19th, 1962 in Mexico City," BSSA, v. 54, n. 1, pp. 209-232.

3. USGS Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms, Digitization and Analysis, 1967-1975 Records, Open-File Report to be published.

4. Morrison, P., Maley, R., Brady, G., Porcella, R., 1977, "Earthquake Recordings on or near dams," USCOLD, November.

5. Espinosa, J. M., Alonso, L., Mora, I., Cajiga, J., Prince, J., 1978, "Informe Preliminar Sobre los sismos del 29 de Noviembre 1978 en el estado de Oaxaca," Instituto de Ingenieria Ciudad universitaria, Mexico, D. F., Diciembre.

6. Alonso, L, Espinosa, J. M., Mora, I., Muria, D., Prince, J., 1979, "Informe Preliminar sobre el sismo del 14 de Marzo de 1979 circa de la costa de Guerrero," Parte A, Instituto de Ingenieria Ciudad Universitaria, Mexico D. F., Marzo.

7. Computer listing from Caltech's Earthquake Engineering Res4arch Laboratory.

8. Bulletin of International Seismological Center.

9. Calculated by using reference number (8).

10. International Seismological Summary.

11. Molnar, P. and Sykes, L. R., 1969, "Tectonics of the Carib- bean and Middle America Regions from focal mechanisms and seismicity," Bull. GSA, v. 80, pp. 1639-1684.

12. United States Earthquakes, annual reports currently published by United States Department of Commerce (NOAA) and United States Department of Interior (Geol. Survey).

13. National Earthquake Information Service, NOAA, U.S. Department of Commerce.

14. Pasadena, Seismological Laboratory, Caltech.

15. Berkeley Seismographic Station, University of California. 92

CATALOG REFERENCES - MEXICO (Cont.)

16. "Seismological Notes," published in Bulletin of Seismo- logical Society of America.

17. Earthquake Research Laboratory, USGS, San Francisco, Calif.

18. Reyes, A., Brune J. N., Lommitz, C., 1979, "Source mechanism and aftershock study of the Colima, Mexico Earthquake of January 30, 1973," BSSA, v. 69, n 6 pp. 1819-1840.

19. Lomnitz location - see Table 3 in reference number (18).

20. An AR-240 Recorded ground motions during the 73-01-30-2101 event. RFT-250 recorded motions for the subsequent earthquakes.

21. Strong Motion Information Retrieval System, USGS, Menlo Park, California. 93

CATALOG REFERENCES - NEW GUTNEA

1. Environmental Data and Information Service, NOAA, Boulder, Colo. from the Strong Motion Data Centre, Bureau of Mineral Resources, Canberra City, Australia.

2. Denham, D. and Small, R. G., 1971, "Strong Motion Data Centre: Bureau of Mineral Resources, Canaberra," Bull. New Zealand Soc. for Earthquake Engineering, v. 4, n. 1, March.

3. Computer Sciences Corporation computer listing, Murphy and 01 Brien 1978) .

4. The accelerations on the NOAA (AU) tape for this component are not oscillatory like normal accelerograms, and therefore, are probably erroneous.

5. According to reference 2 the accelerograms were processed through Volume I stage and only baseline corrected at the Volume II stage. No instrument correction was made.

6. According to Table of reference 2 the instrument was installed in July, 1969, after the earthquakes of 1967 and 1968. This dilema could not be resolved.

7 Betin of the International Seismological Center.

8. U.S. Coast and Geodetic Survey.

9. United States Earthquakes, annual reports currently published by U.S. Department of Commerce (NOAA) and U.S. Department of Interior (Geological Survey).

10. Port Moresby Observatory Seismological Station.

11. National Oceanic Survey.

12. National Earthquake Information Service, NOAA, U.S. Department of Commerce.

13. No Reference.

14. National Earthquake Information Center.

15. Earthquake Research Laboratory, USGS, San Francisco, Calif.

16. Moscow Seismological Station.

17. Pasadena, Seismological Laboratory, Caltech.

18. Berkeley Seismographic Station, University of California. 94

CATALOG REFERENCES - NEW GUINEA (Cont.)

19. Rabaul Seismographic Station.

20. "Seismological Notes,' published in the Bulletin of Seismological Society of America.

21. Preliminary Determination of Epicenters, National Oceanic and Atmospheric Administration. 95

CATALOG REFERENCES - NEW ZEALAND

1. Department of Scientific and Industrial Research, Physics and Engineering Laboratory, Private Bag, Lower Hutt, New Zealand.

2. Computed from the focal depth and epicentral distance given in reference

3. According to reference 1, the instrument is located in a manhole, 2 m deep, and 14 m from the building.

4. According to reference 1, the instrument is on top of a 280 m ridge, east side of valley.

5. According to reference 1, the instrument is at toe of hill, east side of valley.

6. According to reference 1, the instrument is in an old river bed.

7. According to reference 1, the instrument is on top of 274 m ridge, west side of valley.

8. Eiby, G. A., 1978, "The Milford Sound Earthquake of 1976 May 4 Bull. New Zealand Nat. Soc. Earthq. Eng., V. 11, n 3 Sept., pp. 191-192.

9. Hodder, S. B., Skinner, R. I., Hefford, R. T., Randal, P. M., 1978, Strong Motion Records of the Milford Sound Earthquake 1976 May 4 Bull. New Zealand Nat. Soc. Earthq. Eng., v. 11, no. 3 Sept., pp. 184-190.

10. Bulletin of the Internatonal Seismological Center.

11. Pasadena, Seismological Laboratory, Caltech.

12. No reference.

13. Wellington, New Zealand, Seismological Station.

14. According to reference number (1), the structure is a stiff-single story structure with panel walls and a slab floor.

15. Berkeley Seismographic Station, University of California.

16. United States Geological Survey.

17. Prelimnary Determination of Epicenters, National Oceanic and Atmospheric Administration.

18. "Seismological Notes," published in the Bulletin of the Seismological Society of America. 96

CATALOG REFERENCES - NICARAGUA

1. U.S. Department of the Interior, Geological Survey, 1978, "Seismic Engineering Data Report, 1972 Records, Strong-Motion Earthquake Accelerograms, Digitization and Analysis", Open File Report 78-941, 128 p., October.

2. U.S. Department of the Interior, Geological Survey, 1978, "Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms, Digitization and Analysis, 1967-1975 Records," Open File Report to be published.

3. Computer listing from Caltech's Earthquake Engineering Research Laboratory.

4. Epicentral distance computed from coordinates of epicenter and station given in Table of reference (5) and Table of reference 6 respectively.

5. Dewey, J. W. and Algermissen, S. T., 1974, "Seismicity of middle America arc-trench system near Managua," BSSA, v. 64, n 4 pp. 1033-1048.

6. Knudson, C. F., Perez, V., Matthiesen, R. B., 1974, "Strong-Motion Instrumental records of the Managua earthquake of December 23, 1972," BSSA, v. 64, n 4, pp. 1049-1067.

7. Amrhein, J. E., Hegemier, G. A., Krishnamoorthy, G., "Perfor- mance of Native Construction, Masonry Structures and Special Structures in the Managua, Nicaragua Earthquake of December 23, 1972," Managua, Nicaragua Earthquake of December 23, 1972 EERI Conference Proceedings Vol. I, pp. 342-403.

8. Valera, J. E., 'Soil condition and local effects during the Managua earthquake of December 23, 1972," Managua, Nicaragua Earthquake of December 23, 1972, EERI Con- ference Proceedings Vol. I, pp. 232-264.

9. "Engineering report on the Managua earthquake of 23 December 1972," National Academy of Science, 1975, 111 p.

10. Calculated from coordinates and depth given in reference 12).

11. Calculated from depth given in reference 12) and epicentral distance.

12. Bulletin of the International Seismological Center.

13. U.S. Coast and Geodetic Survey.

14. United States Earthquakes, annual reports currently published by U.S. Department of Commerce (NOAA) and U.S. Department oc Interior (Geological Survey). 97

CATALOG REFERENCES - NICARAGUA (Cont.)

15. Algermissen, S. T., Dewey, J. W., Langer, C. J., and Dillinger, W. H., 1974, "The Managua, Nicaragua, earthquake of December 23, 1972: location, focal mechanism and intensity distribution,' BSSA, v. 64, pp. 993-1004.

16. National Earthquake Information Center.

17. Dewey, J. W. and Algermissen, S. T., 1974, 'Seismicity of the Middle America arc-trench system near Managua, Nicaragua," BSSA, v. 64, pp. 1033-1098.

18. No reference.

19. "Seismological Notes," published in the Bulletin of the Seismological Society of America.

20. Ward, P. L., Gibbs, J., Harlow, D., Abusto A. Q., 1974, "Aftershocks of the Managua, Nicaragua, earthquake and the tectonic ignificance of the Tiscapa fault," BSSA, v. 64, pp. 1017-1029.

21. National Oceanic and Atmospheric Administration.

22. Pasadena, Seismological Laboratory, Caltech.

23. Berkeley Seismographic Station, University of California.

24. Computed from reference number 20).

25. Preliminary Determination of Epicenters, National Oceanic and Atmospheric Administration. 98

CATALOG REFERENCES - PERU

1. USGS, Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms: Digitization and Analysis, Records from Lima, Peru: 1951 to 1974, Open File Report 77-587, April, 1977.

2. Earthquakes, R. Husid, Spectral Analysis and characteristics as a basis of earthquake resistant design, Editoral Andres Bello, Santiago, Chile, 1973.

3. Husid, R., Gomez, N., Santolaya, A., 1969, Analisis de Terremotos Peruanos, Primer Congreso Peruano de Sismo- logia e Ingenieria Antisismica, 22-26 de Septiembre, Lima, Peru.

4. Listings of the accelerograms are in Chile and have not been published.

5. Huaco, D. and Rodriguez, A., 1979, "The acceleration of Arequipa Earthquake, February lp, 1979," Earthquake Notes, Eastern Section, SSA, v. 49, n 4 p 1.

6. USGS, Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms: Digitization and Analysis, 1971 Records, Open File Report 76-609, July, 1976.

7. Lee, K. L., and Monge, J., 1968, "Effect of soil conditions on damage in the Peru earthquake of October 17, 1966,' BSSA, v. 58, n 3 pp. 937-962.

8. According to reference 9 the CGS instrument was originally installed in a 2-story building in 1944. In 1963 the accelerograph was moved to a small isolated hut in a nearby park. In April, 1970, it was moved a short distance to its present location, a 1-story building which is the Geophysical Institute.

9. Cloud, W. K. and Perez, V., 1971, "Unusual Accelerograms recorded at Lima, Peru," BSSA, v. 61, n 3, pp. 633-640.

10. Bulletin of the International Seismological Center.

11. United States Earthquakes, annual reports currently published U.S. Department of Commerce (NOAA) and U.S. Department of Interior (Geological Survey).

12. U.S. Coast and Geodetic Survey. 99

CATALOG REFERENCES - PERU (Cont.)

13. Lomnitz, C., 1971, "The Peru earthquake of May 31, 1970: some preliminary seismological results," BSSA, v. 6, pp. 535-542.

14. National Earthquake Information Center.

15. Espinosa, A. F., Husid, R., Algermissen, S. T.,Casas, J. de las, 1977, "The Lima earthquake of October 13, 1974: Intensity distribution," BSSA, v. 67, pp. 1429-1439.

16. Lee, K. L., and Monge J. E., 1968, "Effect of soil conditions on damage in the'Peru earthquake of October 17, 1966,-' BSSA, v. 58, pp. 937-962.

17. Kelleher, J., Sykes L., and Oliver, J., 1973, "Possible criteria for predicting earthquake locations and their applications to major plate boundries of the Pacific and Caribbean," JGR, v. 78, pp. 2547-2585.

18. Geller, R. J., 1976, "Scaling relations for earthquake source parameters and magnitudes," BSSA, v. 66, pp. 1501-1523.

19. Pasadena Seismological Laboratory, Caltech.

20. Kanamori, H. and Anderson, D. L., 1975, "Theoretical basis of some emperical relations in seismology," BSSA, v. 65, pp. 1073-1095.

21. National Earthquake Information Service, NOAA, U.S. Department of Commerce.

22. Arequipa Seismographic Station.

23. 'Seismological Notes," published in the Bulletin of Seismological Society of America.

24. Computed from information given.

25. Berkeley, Seismographic Station, University of California.

26. Kanamori, H., 1977, "The energy release in great earthquakes," JGR., v. 82, pp. 2981-2987.

27. Williams, B. R., 1979, "MO calculations from a generalized AR parameter method for WWSSN instruments," BSSA, v. 69, pp. 329-352.

28. Wyss, M., 1979, "Estimating maximum expectable magnitude of earthquakes from fault dimensions," Geology, v. 7, pp. 336-340. 10 0

CATALOG REFERENCES - PERU (Cont.)

29. Yonekura, N., 1979, "A Review on Crustal deformations associated with great shallow earthquakes of the world," Bulletin of the Department of Geography, University of Tokyo, n. 11, March.

30. Purcaru, G. and Berckhemer, H., 1978, "A Magnitude Scale for very large earthquakes," Tetonophysics, v. 49, pp. 189-198. 10 1

CATALOG REFERENCES - ROMANIA

1. USGS Seismic Engineering Data Report, Romanian and Greek Records, 1972-77, Open-File Report 78-1022, Sept. 1978.

2. Throughout city of Bucharest.

3. USGS Circular 762-A, Seismic Engineering Program Report, January-April 1977.

4. Tezcan, S. S., Yerlici, V., Durgunoglu, H. T., 1978 "A Reconnaissance report for the Romanian earthquake of 4 March 1977," Earthquake Engineering Struc. Dyn., v. 6, n 4 July-August.

5. Digitized Data of Strong-Motion Earthquake Accelerograms in Romania (March 4 1977), Kenchiku Kenkyu Shiryo, BRI, Ministry of Construction, Japan, No. 20, January, 1978.

6. Mandrescu, N., 1978, "The Vrancea Earthquake of March 4, 1977 and the seismic microzonation of Bucharest," Central Inst. of Physics, Centre for Earth Physics and Seismology, August, EP-3-1978.

7. Ambraseys, N. N., 1978, "Preliminary Analysis of European Strong Motion Data 1965-1978,11 Part II, Bull. EAEE, v. 4 pp. 17-37.

8. No reference.

9. Bulletin of the International Seismological Center.

10. "Seismological Notes," published in the Bulletin of the Seismological Society of America.

11. Earthquake Engineering Research Institute Newsletter, v. 12, n 2 March 1978, p. 21.

12. Hartzell, S., 1979, "Analysis of the Bucharest Strong Motion record for the March 4 1977, Romanian earthquake," BSSA, v. 69, pp. 513-530.

13. Moscow Seismological Station.

14. Computed from radius given in reference number 12). 1 2

CATALOG REFERENCES - UNITED STATES (DA a RS TABLES)

1. Strong Motion Earthquake Accelerograms Index Volume, 1976, Caltech, Report No. EERL 76-02, 72 p.

2. Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Vol. II, EERL, Caltech, Parts A-Y, 1971-1975.

3. Strong Motion Earthquake Accelerograms, Digitized Plotted Data, Vol. I, EER1, Caltech, Parts A-Y, 1969-1975.

4. Trifunac, M. D. and Lee, V. W., 1978, "Uniformly Processed Strong Earthquake Accelerations in the Western United States of America for the period from 1933 to 1971: Corrected Acceleration, Velocity, and Displacement Curves," Report No. CE 78-01, Department of Civil Engineering, USC, 220 p.

5. Computer listings from Caltech's Earthquake Engineering Research Laboratory.

6. FUGRO unpublished information.

7. Trifunac, M. D., 1972, "Stress Estimate for the San Fernando, California, Earthquake of February 9 1971: Main Event and Thirteen Aftershocks," BSSA, v. 62, n 3 pp. 721-750, (There are several events per record. Only a range of distances is given).

8. Dobry, R., Idriss, I. M., and Ng, E., 1978, "Duration Characteristics of Horizontal Components of Strong-Motion Earthquake Records," BSSA, v. 68, n. 5, pp. 1487-1520.

9. Vanmarcke, E. H. and Lai, S.-S. P., 1977, "Strong-Motion Duration of Earthquakes," Publication No. R77-16, MIT, 32 p., July.

10. Chang, F. K. and Krinitzsky, E. L., 1977, "State-of-the-Art for Assessing Earthquake Hazards in the United States," Report 8, Duration, Spectral Content, and Predominant Period of Strong Motion Earthquake Records from Western United States, Waterways Experiment Station, Vicksburg, Miss., 82 p., December.

11. San Joaquin Nuclear Project, Early Site Review Report, Vibratory Ground Motion 1977), Subappendix 2 for the Los Angeles Department of Water and Power.

12. Hudson, D.E., editor, 1971, "Strong-Motion Instrumental Data on the San Fernando Earthquake of February 9, 1971," joint report: EERL, Caltech, and Seis. Field Survey, NOAA. 1 3

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

13. Computer Sciences Corporation computer listings, Murphy and O'Brien 1978).

14. Western Hemisphere Strong-Motion Accelerograph Station list - 1976. USGS Open File Report No. 77-374, May 1977, 112 p.

15. Foutch, D. A., Housner, G. W., and Jennings, P. C., 1975, "Dynamic Responses of Six Multistory Buildings during the San Fernando Earthquake," Caltech, Report No. EERL 75-02, 108 p., October.

16. Trifunac, M. D. and Brady, A. G., 1975, "On the Correla- tion of Seismic Intensity Scales with the peaks of Recorded Strong Ground Motion," BSSA, v. 64, n. 1 pp. 139-162.

17. Seed, H. B., Ugas, C., and Lysmer, J., 1974, Site- Dependent spectra for Earthquake - Resistant Design," U.C. Berkeley, Report No. EERC 74-12, November.

18. Seed, H. B., Murarka, R., Lysmer, J., and Idress, I. M., 1975, "Relationships between Maximum Acceleration, Maximum velocity, Distance from Source and Local Site Conditions for Moderately Strong Earthquakes," U.C. Berkeley, Report No. EERC 75-17, July.

19. Grant, W. P., Arango, I., and Clayton, D. N., 1978, "Geotechnical Data at Selected Strong Motion Accelero- graph Station Sites," Proc., Second International Conference on Microzonation, v. II, pp. 983-999.

20. Berrill, J. B., 1975, "A Study of High-Frequency Strong Ground Motion from the San Fernando Earthquake," Caltech Soil Mechanics Laboratory, 270 p.

21. Crouse, C. B., 1973, "Engineering Studies of the San Fernando Earthquake,' Caltech Report No. 73-04, 153 p., March.

22. Chang, F. K., 1978, "State-of-the-Art for Assessing Earth- quake Hazards in the United States," Report 9 Catalogue of Strong Motion Earthquake Records, Volume I, Western United States, 1933-1971, Waterways Experiment Station, Vicksburg, Miss., April.

23. Hileman, J. A., Allen, C. R., Nordquist, J. M., 1973, "Seismicity of the Southern California Region, 1 January 1932 to 31 December 1972," Seismological Laboratory, Caltech.

24. Fugro San Joaquin Nuclear Project File F/NC2 Task 26-16. 1 4

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

25. Silverstein, B. L., 1978, "Geological Description of Selected Strong Motion Accelerograph Sites," Part I, USGS Open File Report No. 78-1005.

26. There is no basement as such; the first floor on the western half of the building where the instrument is located is embedded about five feet below ground level.

27. Basement is north of upper stories which sit on pillars.

28. Jennings, P. C., Matthiesen, R. B., Hoerner, J. B., 1971, "Forced Vibration of a 22-story Steel Frame Building," CIT EERL and UCLA EESL, February.

29. According to Station I.D. sheets published by Seismologi- cal Field Survey, the building dimensions are 152 x 73 feet; however, there is a 4-story parking structure annexed to the south side of the building.

30. According to reference 24), basement dimensions are 240 x 120 feet; however, area of building at ground level is much larger 9300 sq. m) due mainly to adjoining parking structure.

31. According to reference 24), structure is cylindrical with diameter of about 109 feet.

32. Accelerographs at Isabella dam are also located on crest, toe and lower spillway of earth dam and crest of auxiliary dam.

33. The basement complex is under the multi-story building section only and is approximately 12 feet higher on the Northeast side than the Southwest side of the building.

34. Location is now called Edmunston Pumping Plant. In addition to an instrument located in a small prelab building at the time of the San Fernando earthquake, there are now two instruments in the pumping plant.

35. At the time of the San Fernando earthquake only one instrument (RFT250) was on the dam (crest). Prior to 1976 this instrument was removed and new SMAl instruments were installed on the crest and left and right abutments.

36. At the time of the San Fernando earthquake, one RFT250 instrument was located in a small struture on the crest of a dam. Since that earthquake another instrument was installed upstream. 105

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

37. At the time of the San Fernando earthquakes, one RFT250 instrument was located in a small building on the crest. Since then, two other instruments were placed on the abutment and toe.

38. Basement is on the north side of the building; the approximate dimensions of the basement-are 40 x 50 feet.

39. According to reference 24), the building at 1625 Olympic is joined above ground level to the one at 1605 Olympic. The foundations of these buildings are separated.

40. At the time of the San Fernando earthquake, one instrument was located in the pump house and this instrument triggered. After that event SMAl instruments were installed.

41. There are two wings to the building; the old wing, where the instruments are located, is arcuate shaped and has an area of aproximately 2000 sq. m.

42. The foundation for the three 5000 KVA synchronous con- densers consist of a massive concrete block approx. 33 x 28 x 56 feet which is embedded about 20 feet into the ground.

43. "Geotechnical and Strong Motion Earthquake Data from U.S. Accelerograph Stations, Ferndale, Cholame El Centro Ca," NUREG-0029, v. 1, Shannon Wilson and Agbabian Assoc., 1976."11

44. Prior to the 1971 San Fernando earthquake a CGS Standard instrument was in operation. Just before the 1971 event a SMAl was installed.

45. According to reference 46), the instrument is located in a partially underground tunnel about 100 feet long, which connects two sections of a school building of different plan dimensions. The northern section is two stories with plan dimensions of 40 x 170 feet; the southern section is a combination one and two story structure, irregularly shaped, with a floor area on the order of 20,000 square feet.

46. "Geotechnical and Strong Motion Earthquake Data from U.S. Accelerograph Stations," NUREG-0029, v. 2 Shannon & Wilson and Agbabian Assoc., 1978.*

47. "Processed Data from the Partial Strong-Motion Records of the Santa Barbara EArthquake of 13 August 1978, Prelimin- ary Results," CDMG Preliminary Report 23, 1979. 1 6

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

48. "U.S. Earthquakes, 1928-1935,m U.S. Department of Com- merce, Environmental Science Services Administration, Coast and Geodetic Survey, 1968.

49. According to reference 48), the building is U-shaped with overall dimensions of 254 x 402 feet.

50. According to reference 48), the building is E-shaped with the overall dimensions being 275 x 210 feet.

51. According to reference 48), the instrument is located in the train shed, 64 feet under Olive Street, west of the building. This portion of the shed is structurally independent from main building.

52. Mulhern, M. R. and Maley, R. P., 1973, "Building Period Measurements Before, During, and After the San Fernando Earthquake," in San Fernando, California, Earthquake of February 9 1971, U.S. Department of Commerce, NOAA, v. 1, Part B.

53. "Data from selected accelerograph stations at Wilshire Blvd., Century City, and Ventura Blvd., Los Angeles, CA,- NUREG/CR-0074, Shannon Wilson and Agbabian Assoc., 1978.*

54. State of California Water Rights Board, San Fernando Valley Reference, Plate 6 A case in Superior Court in and for the County of Los Angeles, City of Los Angeles (Plantiff) and City of San Fernando (Defendant), 1962.

55. Duke, C. M., Johnson, J. A., Kharry, Y., Campbell, K. W., and Malpiede, N. A., 1973, "Subsurface conditions in the San Fernando Earthquake Area," in San Fernando, California, Earthquake of February 1971, U.S. Department of Commerce, NOAA, v. 1, Part B.

56. Gates, W. E., 1973, "Certified Life Building 35), in San Fernando, California, Earthquake of February 9, 1971, U.S. Deparment of Commerce, NOAA, v. 1, Part B.

57. 'Geotechnical Data Compilation for selected Strong Motion Seismograph Sites in California,' 1973, Woodward Lundgren Assoc. for NOAA.

58. USGS Stations, Santa Barbara Earthquake, 813/78. 107

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

59. AR240 recorded ground motion from April 8, 1968, Borrego Mountain earthquake. RFT250 replaced AR240 and recorded all subsequent ground motions.

60. AR240 recorded ground motion from 48/68 and 74/68 earthquakes. RFT250 replaced AR240 and recorded all subsequent ground motions.

61. U.S. Department of Commerce, Coast and Geodetic Survey, Serial No. 762. United States Earthquakes 1951-1965 by L. M. Murphy, W. K. C.and, U.S. Government printing office, Washington 1953.

62. Abdel-Ghaffar, A. M., 1977, "Engineering Data Analysis of the Whittier, California Earthquake of January , 1976," Caltech EERL 77-05, November.

63. USGS, Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms, Digitization and Analysis, 1967-1975 Records, Open File Report to be published.

64. Information obtained from Strong Motion Information, Retrieval System, USGS, Menlo Park, California.

65. U.S. Department of Commerce Coast and Geodetic Survey, Serial No. 629, United States Earthquakes 1936-1940, by rank Neumann.

66. Wood, J. H., 1972, "Analysis of the Earthquake Response of a Nine-Story Steel Frame Building During the San Fernando Earthquake," Caltech Report No. 72-04, 147 ., October.

67. Data Report on Santa Barbara Earthquake, August 13, 1978, Kinemetrics.

68. Miller, R. K., and Felszeghy, S. F., 1978, "Engineering Features of the Santa Barbara Earthquake of August 13, 1978,- UCSB-ME-78-2, December.

69. Southern California Edison Company, P.O. Box 800, 2244 Walnut Grove, Rosemead, CA 91770. Attn. Dr. Dennis Ostrom.

70. Basement is under the western half of the building. The dimensions of the basement are approximately 21 x 29 meters while the dimensions of the ground floor are 42 x 33 meters.

71. Compilation of Strong-Motion Records Recovered from the Santa Barbara Earthquake of 13 August, 1978, CDMG Preliminary Report 22. 108

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

72. Instrument is located in Valve House. Reference 71 - pp. 35.

73. Woodward-Clyde Consultants computer listing.

74. Seekins, L. C. and Hanks, T. C., 1978, "Strong-Motion Accelerograms of the Oroville Aftershocks and Peak Acceleration Data," BSSA, v. 68, n 3 pp. 677-690.

75. Topozada R T., Wells, W. M., Power, J H., and Hanks, T. C., 1976, "Strong Motion Accelerograms of the Aftershocks,' Oroville, California, Earthquake, 1 August 1975, CDMG Special Report 124, pp. 101-107.

76. USGS, Seismic Engineering Data Report, Strong-Motion Earthquake Accelerograms, Digitization and Analysis, 1971 Records, Open File Report No. 76-609, July, 1976.

77. USGS, Seismic Engineering Data Report, Strong-Motion Earth- quake Accelerograms, Digitization and analysis, 1971 Records, Open File Report No. 78-941, October, 1978.

78. EDIS/NOAA.

79. CIT/EERL.

80. USGS, Seismic Engineering Data Report, 1974-75 Records, Strong Motion Earthquake Accelerograms, Digitization and Analysis, Open-File Report No. 79-929, May, 1979.

81. Herrmann, R. B., "Analysis of Strong Motion Data from the New Madrid Seismic Zone: 1975-1976," Department of Earth and Atmospheric Sciences, St. Louis Univ., August, 1977. (Mistake in Table - noted and corrected).

82. Seed, H. B., Ugas, C., and Lysmer, J., 1976, Site- Dependent Spectra for Earthquake Resistant Design," BSSA, v. 66, n. 1, pp. 221-244.

83. Grant, W. P., Arango, I., and Clayton, D. N., 1978, "Geo- technical Data at Selected Strong-Motion Accelerograph Station Sites," Proc. 2nd International Conference Microzonation, v. II, pp. 983-999.

84. Dielman, R. J., Hanks, T. C., and Trifunac, M. D., 1975, "An array of strong motion accelerographs in Bear Valley, California,' BSSA, v. 65, n. 1, pp. 112. 109

CATALOG REFERENCES - UNITED STATES (DA RS TABLES) (Cont.)

85. Geotechnical Data Compiltion for selected Strong Motion Seismograph Sites, Woodward-Lundgren and Assoc., for NOAA, December, 1973.

86. Personal communication, A. G. Brady, 1979.

87. Herrmann, R. B., Fischer, G. W., nd Zollweg, J. E., 1977, "The June 13, 1975 earthquake and its relationship to the New Madrid seismic zone," BSSA, v. 67, n. 1, pp. 209-218.

88. Professor James N. Brune, University of California at San Diego, Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, Califor- nia 92093.

89. Hartzell, S. and Brune, J. N., 1979, "The Horse Canyon Earthquake of August 2 1975 - Two Stage Stress-Release Process in a Strike-Slip Earthquake," BSSA, v. 69, n 4 pp. 1161-1173.

90. Computed from listings of accelerograms provided by Steve Hartzell.

91. ccording to reference 89), the accelerograms were digitized at a sample interval of 0.01 seconds and corrected for the response of the instrument.

92. Computed from coordinates of epicenter and station.

93. Steve Hartzell's unpublished notes.

94. Boore, D. M., Joyner, W. B., Oliver, A. A., and Page, R. A., 1978, "Estimation of ground motion parameters," U.S. Geological Survey Circular 795, 43 p.

95. Page, R. A., Boore, D. M., Joyner, W. B., and Coulter, H. W., 1972, "Ground motion values for use in the seismic design of the trans-Alaska pipeline system," U.S. Geological Survey Circular 672, 23 p.

Available for purchase from the NRC/GPO Sales Program, U.S. Nuclear Regulatory Commission, Washington, DC 20555, and the National Technical Information Service, Springfield, VA 22161. 110

CATALOG REFERENCES - UNITED STATES (EQ TABLES)

1. International Seismological Center.

2. Pasadena, Seismological Laboratory, Caltech.

3. Kanamori, H. and Anderson, D. L., 1975, "Theoretical basif of some empirical relations in seismology," BSSA, v. 65, pp. 1073-1095.

4. Thatcher, W. and Hanks, T. C., 1973, "Source Parameters, of Southern California earthquakes," JGR, v. 78, pp. 8547-8576.

5. Geller, R. J., 1976, 'Scaling relations for earthquake source parameters and magnitudes," BSSA, v. 66, pp. 1501-1523.

6. Berkeley Seismographic Station, University of California.

7. Bolt, B. A., Lomnitz, C. and McEvilly, T. V., 1968, 'Seismological evidence on the tectonics of central and northern California and the Mendocino escarpment," BSSA v. 58, pp. 1725-1768.

8. Smith, S. W. and Van de Lindt, W., 1969, "Strain adjust- ments associated with earthquakes in southern California," BSSA, v. 59, pp. 1564-1589.

9. United States Earthquakes, annual reports currently published by U.S. Department of Commerce (NOAA) and U.S. Department of Interior (Geological Survey).

10. Gutenberg, B. and Richter, C. F., 1954, "Seismicity of the Earth and Associated Phenomena," Seismological Labora- tory, Caltech, published by Princeton University Press.

11. California Institute of Technology, Earthquake Engineering Research Laboratory, 1975, "Strong Motion Earthquake Accelerograms," v. I, Part U.

12. Earthquake History of the United States, U.S. Department of Commerce (NOAA), published in 1976.'

13. National Earthquake Information Center, NOAA, U.S. Department of Commerce.

14. Trifunac, M. D. and Brune, J. N., 1970, "Complexity of Energy release during the Imperial Valley, California earthquake of 1940," BSSA, v. 60, pp. 137-160. CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

15. Magnitude has been averaged from range of values given in reference number 14).

16. Gutenberg, B., 1955, "The first motion in longitudinal and transverse waves of the main shock and the direction of dip,' in Earthquakes in Kern County California During 1952, G. B. Oakeshott editor: California Division of KEnes and Geology, Bulletin 171.

17. Gibowiez, S. J., 1973, "Stress drop and aftershocks," BSSA, v. 63, pp. 1433-1446.

18. Benioff, B., 1955, "Mechanism and strain characteristics of the White Wolf fault as indicated by the aftershock sequence," in Earthquakes in Kern County California During 1952, G. B. Oakeshott editor: California Division of Mines and Geology, Bulletin 171.

19. Kanamori, H. and Jennings, P. C., 1978, "Determination of Local Magnitude, ML, from Strong Motion Accelero- grams," BSSA, v. 68, n 2 pp. 471-485.

20. Nowroozi, A. A., 1973, "Seismicity of the Mendocino escarpment and the aftershock sequence of June 26, 1968: ocean bottom seismic measurements," BSSA, v. 63, pp. 441-456.

21. Tocher', D., 1959, "Seismographic results from the 1957 San Francisco earthquakes," in San Francisco Earthquakes of March 1957: California Division of Mines and Geology, Special Report 57, pp. 61-71.

22. California Institute of Technology, Earthquake Engineering Research Laboratory, 1975, "Strong Motion Earthquake Accelerograms," v. I, Part T.

23. Algermissen, S. T. and Harding, S. T., 1965, "Preliminary Seismological report," in The Puget Sound, Washinqton Earthquake of April 29, 1965: U.S. Department of Commerce, Coast and Geodetic Survey, U.S. Government Printing Office, Washington, 51 p.

24. Langston, C. A. and Blum, D. E., 1977, "The April 29, 1965, Puget Sound earthquake and the crustal and upper mantle structure of western Washington," BSSA, v. 67, n 3 pp. 693-711.

25. Magnitude from reference number 3 is Ms 6 14.

26. Magnitude from reference number (10) is Ms 5 34. 112

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

27. Magnitude from reference number 6 is Ms = 6 34 - 7.

28. U.S. Coast and Geodetic Survey.

29. Williams, B. R., 1979, "MO calculations from a generalized AR parameters method for WWSSN instruments," BSSA, v. 69, pp. 329-352.

30. Anderson, J., 1974, "A dislocation model for the Parkfield earthquake," BSSA, v. 64, pp. 671-686.

31. Ebel, J. E., Burdick, L. J., and Stewart, G. S., 1978, "The source mechanism of the August 7 1966 El Golfo earthquake," BSSA, v. 68, pp. 1281-1292.

32. Ryall, A., Van Wormer, J. D. and Jones, A. E., 1968, "Trig- gering of microearthquakes by earth tides, and other features of the Truckee, California earthquake sequence of September, 1966," BSSA, v. 60, pp. 1199-1208.

33. Tsai, Y. and Aki, K., 1970, "Source mechanism of the Truckee, California earthquake of September 12, 1966,11 BSSA, v. 60, pp. 1199-1208.

34. Magnitude from reference number 2 is Ms = 6 14 - 6 12.

35. Wyss, M. and Hanks, T. C., 1972, "Source parameters of the Borrego Mountain earthquake," in The Borreo Mountain Earthquake of April 9 1968: U.S. Geological Survey Professional Paper 787.

36. Allen, C. R., Engen, G. R., Hanks, T. C., Nordquist, J. M., and Thatcher, W. R., 1971, "Mainshock and larger aftershocks of the San Fernando earthquake, February 9 through March 1, 1971," in The San Fernando, California Earth- quake of February 9 1971: U.S. Geological Survey Professional Paper 733.

37. Kanamori, H., 1978, "Quantification of Great Earthquakes," Tectonophysics, v. 49, pp. 207-212.

38. Earthquake Research Laboratory, USGS, San Francisco, Calif.

39. Moscow Seismological Station.

40. Ellsworth, W. L., Campbell, R. H., Hill, D. P., Page, R. A., Alewine III, R. W., Hanks, T. C., Heaton, T. H., Hileman, J. A., Kanamori, H. Minster, B., and Whitcomb, J. H., 1973, "Point Mugu, California, earthquake of 21 February 1973 and its aftershocks," Science, v. 182, pp. 1127-1129. 113

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

41. Castle, R. O., Church, J. P., Elliott, M. R., and Savage, J. C., 1977, "Preseismic and coseismic elevation changes in the epicentral region of the Point Mugu earthquake of February 21, 1973," BSSA, v. 67, pp. 219-231.

42. Nielsen, N. N., Furumoto, A. S., Lum, W., and Morrill, B. J., 1977, "The Honomu Hawaii earthquake,' National Academy of Sciences, Washington, D. C.

43. Kilauea, Hawaii Volcano Observatory.

44. Reference number 42) as listed by U.S. Geological Survey.

45. No Reference.

46. Herrmann, R. B., Fischer, G. W." and Zollweg, J. E., 1977, "The June 13, 1975 earthquake and its relationship to the New Madrid Seismic zone," BSSA, v. 67, pp. 209-218.

47. Magnitude from reference number 46) s Mb = 44 12.

48. Magnitude is an MbLg of Nuttli as reported by St. Louis Missouri.

49. Bakun, W. H. and Lindh, A. G., 1977, "Local magnitude, Seismic moments and coda durations for earthquakes near Oroville, California," BSSA, v. 67, pp. 615-629.

50. Morrison, P. W., Jr., Stump, B. W., Uhrhammer, R., 1976, "The Oroville earthquake sequence of August 1975," BSSA, v. 66, pp. 1065-1084.

51. Langston, C. A. and Butler, R., 1976, "Focal mechanism of the August 1, 1975, Oroville earthquake," BSSA, v. 66, pp. 1111-1120.

52. Lahr, K. M., Lahr, J. C., Lindh, A. G., Bufe, C. B, and Lester, F. W., 1976, "The August 1975 Oroville earthquakes," BSSA, v. 66, pp. 1085-1099.

53. Preliminary Determination of Epicenters.

54. Seekins, L. C. and Hanks, T. C., 1978, "Strong motion accelerograms of the Oroville aftershocks and peak acceleration data," BSSA, v. 68, pp. 677-689.

55. Morrison, P. W., Jr., Stump, B. W., Uhrhammer, R., 1976, "The Oroville earthquake sequence of August 1975," BSSA, v. 66, pp. 1065-1084. 114

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

56. Abdel-Ghaffar, A. M., 1977, 'Engineering data and Analysis of the Whittier, California earthquake of January , 1976," Earthquake Engineering Research Laboratory of California Institute of Technology, EERL 77-05, Pasadena.

57. Herrmann, R. B. and Canas, J. A., 1978, "Focal Mechanism Studies in the New Madrid seismic zone," BSSA, v. 68, pp. 1095-1102.

58. Porter, L. D., Ragsdale, J. T., and McJunkin, R. D., 1979, 'Processed data from the partial strong-motion records of the Santa Barbara earthquake of 13 August, 1978," California Division of Mines and Geology, Preliminary Report 23.

59. Person, W., 1979, 'Significant earthquakes of the world 1978," Earthquake Engineering Research Institute News- letter, v. 13, n 2 pp. 43-54.

60. United States Geological Survey.

61. Richter, C. F., 1955, "Foreshocks and aftershocks," in Earthquakes in Kern County California During 1952, G. B. Oakeshott editor: California Division o Mines and Geology, Bulletin 171.

62. "Seismological Notes," published in the Bulletin of the Seismological Society of America.

63. Benioff, H., 1938, 'The determinaton of the extent of faulting with applications to the Long Beach earthquake," BSSA, v. 28, pp. 77-84.

64. San Andreas Fault In Southern California, A Guide to San Andreas fault from Mexico to Carrizo Plain, 1975, California Division of Mines and Geology Special Report 118, Edited by John C. Crowell; Preliminary Fault and Geologic Map of Southern California by Charles W. Jennings, map reprinted from Preliminary Report 13), 1973.

65. Fara, H. D., 1964, 'A new catalog of earthquake fault plane solutions," BSSA, v. 54, pp. 1491-1517.

66. Hanks, T. C., Hileman, J. A., and Thatcher, W., 1975, 'Seismic moments of the larger earthquakes of the Southern California region,' BGSA, v. 86, pp. 1131-1139.

67. Evernden, J. F., 1975, "Seismic intensities, 'size' of earthquakes and related parameters,' BSSA, v. 65, p. 1287-1313. 11 5

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

68. Trifunac, M. D., 1972, "Tectonic stress and the source mechanism of the Imperial Valley, Califoria earthquake of 1940," BSSA, v. 62, pp. 1283-1302. Source parameters for 1940 earthquakes: first line for P-wave data, second line for S-wave data.

69. Maximum surface displacement, United States Earthquakes, annual reports currently published by U.S. Department of commerce (NOAA) and U.S. Department of Interior (Geological Survey).

70. US0014 through US0022 have been identified by Trifunac, 1970, as individual sources within the complex rupture sequence of the Imperial Valley earthquake, US0013. These are not aftershocks in the usual sense.

71. Nuttli, 0. W., 1952, "The western Washington earthquake of April 13, 1949," BSSA, v. 42, pp. 21-28.

72. Oakeshott, G. B., 1955, "The Kern County earthquakes in California's geologic history," in Earthquakes n Kern County California During 1952, G. B. OakesS-ott editor: California Division of Mines and Geology, Bulletin 171.

73. Intensity in U.S., not epicentral intensity, reported by Pasadena, Seismological Laboratory, Caltech.

74. Savage, J.C. and Wood, M. D., 1971, "The relation between apparent stress and stress drop," BSSA, v. 61, pp. 1381-1388.

75. Smith, R. B. and Sbar, M. L., 1974, "Contemporary tectonics and seismicity of the Western United States with emphasis on Intemountain Seismic Belt," BSSA, v. 85, pp. 1205-1218.

76. U.S. Coast and Geodetic Survey.

77. Bulletin of the International Seismological Center.

78. Trifunac, M. D. and Udwadia, F. E., 1974, 'Parkfield, California, earthquake of June 27, 1966: a three- dimensional moving dislocation," BSSA, v. 64, p. 511-534.

79. Scholz, C. M., Wyss, M., and Smith, S. W., 1969, "Seismic and aseismic slip on the San Andreas fault," JGR, v. 74, pp. 2049-2069. 116

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

80. Wu, F. T., 1968, 'Parkfield earthquake of June 28, 1966: magnitude and source mechanism,' BSSA, v. 58, pp. 689-709.

81. Hanks, T. C. and Wyss, M., 1972, "Use of body-wave spectra in the determination of seismic-source parameters," BSSA, v. 62, pp. 561-589.

82. Heaton, T. H. and He1mberger, D. V.,.1977, "A study of the strong ground motion of the Borrego Mountain, California, earthquake," BSSA, v. 67, n 2 pp. 315-330.

83. Burdick, L. J. and Mellman, G. R., 1976, "Inversion of body waves from the Borrego Mountain earthquake to the source mechanism," BSSA, v. 66, pp. 1485-1499.

84. Allen, C. R. and Nordquist, J. M., 1972, "Forshock, mainshock, and larger aftershocks of the Borrego Mountain earthquake,' in The Borrego Mountain Earthquake of April 9, 1968: U.S. Geological Survey Professional Paper 787.

85. Carl Newton, personal communication, 1973.

86. Wesson, R. L., Lee, W. H. K., and Gibbs, J. F., 1971, "Aftershocks of the earthquake," in The San Fernando, California, Earthquake of February 9 1971: U.S. Geological Survey Professional Paper 733.

87. Wyss, M., 1971, 'Preliminar 'y source parameter determination of the San Fernando earthquake,' in The San Fernando, California, Earthquake of February 9 1971: U.S. Geological Survey Professional Paper 733.

88. Kanamori, H., 1978, "Quantification of Great Earthquakes,' Tectonophysics, v. 49, pp. 207-212.

89. Trifunac, M. D., 1974, "A three-dimensional dislocation model for the San Fernando, California, earthquake of February 9 1971," BSSA, v. 64, pp. 149-172.

90. Trifunac, M. D., 1972, "Stress estimates for the San Fernando, California, earthquake of February 9 1971: main event and thirteen aftershocks," BSSA, v. 62, pp. 721-750.

91. Mikumo, T., 1973, "Faulting process of the San Fernando earthquake of February 9 1971, inferred from static and dynamic near-field displacements," BSSA, v. 63, pp. 249-269. 117

CATALOG REFERENCES - UNITED STATES (EQ TABLES) (Cont.)

92. Whitcomb, J. H., 1971, "Fault plane solutions of the February 9 1971, San Fernando earthquake and some aftershocks," in The San Fernando, California, Earth- quake of February 9 1971: U.S. Geological Survey Professional reaper 733.

93. Wesson, R. L., Lee, W. H. K., and Gibbs, J. F., 1971, "Aftershocks of the earthquake," in The San Fernando,- California, Earthquake of February 9 1971: U.S. Geological Survey Professional Paper 733.

94. The parameters listed are representative, but they do not include all published estimates.

95. Helmberger, D. V. and Johnson, L. R., 1977, "Source parameters of moderate size earthquakes and the importance of receiver crustal structure in interpreting observations of local earthquakes," BSSA, v. 67, pp. 301-313.

96. Johnson, L. R. and McEvilly, T. V., 1974, "Near-field observations and source parameters of central California earthquakes," BSSA, v. 64, pp. 1855-1886.

97. Lee, W. H. K., Yerkes, R. F., and Semirenks, M., 1979, 'Recent earthquake activity and focal mechanism in the western Transverse Ranges, California," U.S. Geological Survey Circular 799-A.

98. Boore, D. M. and Stiermant D. J., 1976, "Source parameters of the Point Mugu, California earthquake of February 21, 1973," BSSA, v. 66, pp. 385-404.

99. Butler, R., 1979, wShear-wave travel times from SS,' BSSA, v. 69, pp. 1715-1732.

A. Unger, J. D. and Ward, P. L., 1979, "A large deep Hawaiian earthquake - the Honomu, Hawaii event of April 26, 1973," BSSA, v. 69, pp. 1771-1781.

B. Hart, R. S., Butler, R., and Kanamori, H., 1977, "Surface wave constraints on the August 1, 1975, Oroville earthquake,' BSSA, v. 67, pp. 108.

C. Miller, R. K. and Felszeghy, S. F., 1978, "Engineering features of the Santa Barbara earthquake of August 13, 1978," University of California at Santa Barbara, UCSB-ME-78-2. 118

CATALOG REFERENCES - U.S.S.R.

1. USGS Circular 762-A, Seismic Engineering Program Report, January - April 1977.

2. Ambraseys, N. N., 1978, "Preliminary Analysis of European Strong-Motion Data 1965-1978" Part II, Bull. EAEE, v. 4 pp. 17-37.

3. EDIS/NOAA listings of accelerogram or Shteinberg, V. V., Pletnev, K. G., and Greizer, V. M., 1976, "Digitized Accelerogram from the Destructive Gazli Earthquake of 17 May 1976," Inst. of Physics of Earth, U.S.S.R. Academy of Sciences, Moscow.

4. Calculated using information from Shteinberg et. al. publication in reference 3.

5. Bulletin of the International Seismological Center.

6. National Earthquake Information Center, NOAA, U.S. Department of Commerce.

7. United States Geological Survey.

8. Moscow Seismological Station.

9. Pasadena, Seismological Laboratory, Caltech.

10. Berkeley Seismographic Station, University of California.

11. "Seismological Notes,' published in the Bulletin of the Seismological Society of America. 119

CATALOG REFERENCES - YUGOSLAVIA

1. Institute of Earthquake Engineering and Engineering Seis- mology, 1977, "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Volume II - Uncorrected Data, Part A - Accelerograms IIA01-IIA09" University, Kiril and Metodij, Skopje, Yugoslavia.

2. Institute of Earthquake Engineering and Engineering Seis- mology, 1976, "Strong Motion Earthquake Accelerograms, Digitized and Plotted Data, Volume II - Uncorrected Data, Part C - Accelerograms IIA01-IIA09" University, Kiril and Metodij, Skopje, Yugoslavia.

3. Ambraseys, N. N., 1978, "Preliminary Analysis of European Strong-Motion Data 1965-1978," Part II, Bull. EAEE, v. 4 pp. 17-37.

4. Computer Sciences Corporation computer listing, Murphy and O'Brien 1978) .

5. "Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the Antiseismic Design of Nuclear Installations,' Parts I, II, and III, OECD-NEA/CSNI Report No. 28, May 1978.

6. Institute of Earthquake Engineering and Engineering Seismology, Skopje, May 1977, "Analysis of Strong Mot-ion Records of the Vrancea-Romania Earthquake of March 4 1977, Obtained in Nis-Yugoslavia.

7. "The Strong-Motion Earthquake Observation Network in Yugoslavia" Strong Motion Laboratory Publication No. 47, Bulletin No. 1, Skopje, March 1975.

8. Information on the station could not be found in the literature.

9. Bulletin of International Seismological Center.

10. No Reference.

11. National Earthquake Information Center, NOAA, U.S. Department of Commerce.

12. Athens Seismological Institute.

13. "Seismological Notes,' published in Bulletin Seismological Society of Aerica.

14. United States Earthquakes, annual reports currently published by the United States Department of Commerce (NOAA) and United States Department of Interior (Geol. Survey). 120

CATALOG REFERENCES - YUGOSLAVIA (Cont.)

15. Rome Seismological Station.

16. 'Seismological Notes,' published in Bulletin Seismological Society of America.

17. Earthquake Engineering Research Institute Newsletter, v. 12, n 2 March, 1978.

18. Hartzell, S., 1979, "Analysis of the Bucharest strong motion record for the March 4 1977 Romanian earthquake," BSSA, v. 69, pp. 513-530.

19. Bureau Central International De Seismologie.

20. Basili, M., Cagnetti, V., Polinari, S., Tinelli, G., Caputo, M., Console, R., Roveli, A., "Estimate of seismic moment and other seismic parameters of some 1976 Friuli earthquakes," Proceedings of Specialist Meeting on the 1976 Friuli Earthquake and the Anti- seismic Design of Nuclear Installtions, OECD-NEA/CSNI Report No. 28, v. II, p. 387-399.

21. Berkeley Seismographic Station, University of California.

22. Pasadena, Seismological Laboratory, Caltech.

23. U.S. Geological Survey.

24. Moscow Seismological Station.

25. Computed from reference number 20).

26. Institute of Earthquake Engineering and Engineering Seismology, 1979, "Preliminary analysis of strong motion records obtained at Ulcinj, Bar and Petrovac from the April 15, 1979 Monte Negro-Yugoslavia earthquake," Publication No. 64, April.

27. Preliminary Determination of Epicenters, National Oceanic and Atmospheric Administration. 12

APPENDIX

B. CHARACTERISTICS OF STRONG-MOTION ACCELEROGRAPHS

The tables presented on the following pages list the nominal characteristics and specifications of strong-motion accelerographs which recorded accelerograms that were cataloged during this project. The accelerograph characteristics were compiled from Hudson 1970, 1979), SMEOC 1978), Pletnev and others

(1977), USGS (1976b), PHRI 1975), and Halverson 1971).

Information on the Soviet Union's SSRZ and Japan's ERS accelerographs is incomplete. Specifications for Japan's ERS-A accelerograph have not been listed separately in the table because they are identical to the ones listed for the ERS-B model with one exception. The ERS-A uses magnetic tape data recorders, while the ERS-B uses electromagnetic oscillographs

(PHRI, 1975).

China's RDZ accelerograph was not included in the table because too little is known about its characteristics. Some information on this instrument can be found in Bolt and Cloud 1974).

Limited information on the transducers of the Kinemetrics CRA-1 central recording system, which recorded ground motions at the

Frietas building in Santa Barbara during the August 1978 Santa

Barbara earthquake, can be found in CDMG 1979).

A number of accelerogaphs were manufactured by the U.S. Coast and Geodetic Survey that have been referred to in the litera- 12 2

ture as Standard (STD), USC&GS, CGS, and other names. All are similar, but some differ in detail. Specifications are given in the table for the USC&GS as reported in Hudson 1970) and

Halverson 1971). 23

TABLE B-1. INSTRUMENT CHARACTERISTICS

JAPAN JAPAN JAPAN JAPAN DC3C ERS-B ERS-C SMAC-A (A2)

Undamped Natural Frequency, Hz 10 2 3 1 7)

Damping, Critical 100 67 67 100 Uj Oil electro- electro- air Damping Type piston magnetic magnetic piston

Sensitivity, cm1g 4 10 or 49 4 (8)

Full Scale, g 1

Speed, cm/sec 1 2 4 1 waxed waxed Medium paper paper

Total Record Time, min 1,2,3 3 C, Uj Repeat Cycles 15,10,5 3 micro- hand-wound Drive motor spring

Time Marks /sec L,2,5 10 10 I L spring + spring Starter Type elect. contact elect. contact

Direction. vert. vert.

Nat. Freq., Hz 3.3 3.3

Damping, Critical

Trigger Level, g 0.01 0.01

Start Time Delay

4 dry 8 dry Power Supply cells cells

Size, cm 79x57x36 56x48(74)x84

Weight, kg 24

TABLE B-1. INSTRUMENT CHARACTERISTICS GONT.)

JAPAN JAPAN JAPAN JAPAN SMAC-A (B2) SMAC-D SMAC-E2 MO-2

Undamped Natural Frequency, Hz 1 7 20 20 33

Damping, Critical 100 100 60 60 C-3 air air air oil E Damping Type piston piston piston paddle C13 Sensitivity, cm/g 4 (8) 1 1 1.5(H) 2.2(V)

Full Scale, 1 1 L

Speed, cm/sec 1 0.5 0.5 1.5 waxed scratch scratch 35 mm film Medium paper film film (unperf.)

Total Record Time, min 3 1.5 1.5 47.70

C2 jr-a Repeat Cycles 5 100 100 9,5 hand-wound DC DC DC Drive spring motor motor motor 5.5 Hz trace Time Marks /sec 1 1/5 2 interruption L

spring + spring spring electro Starter Type elect. contact elect. contact elect. contact magnetic

Direction vert vert. vert. vert.

Nat. Freq., Hz 3.3 3.3 3.3 6.6

Damping, Critical low

Trigger Level, g 0.01 0.005 0.005 0.01

LS tart Time Delay <0.10

4 dry 4 dry 10 dry Power Supply cells cells cells 12 vdc

Size, cm 37x54x54 45x45x35 45x45x35 18xl8x44

Weight, kg 9 125

TABLE B-1. INSTRUMENT CHARACTERISTICS (CONT.)

U.S. U.S. U.S. U.S. USSR AR-240 RFT-250 SMA-1. USC&GS SSRZ

Undamped Natural Frequency, Hz 25 20 20-25 12.-23. 20

Damping, Critical 60 60 60 60 60 Electro- Electro- Electro- Damping Type Magnetic Magnetic Magnetic magnetic 2C Sensitivity, cm/9 5-7.5 1.9 1.9 6-20 1.45

Full Scale, g 1 1 1 -- --

Speed, cm/sec 2 1 1 1 1.3-1.5 12 in. photo 70mm 70mm photo Medium paper film film paper

Total Record Time, 30 50 25 1.25 min C= Auto. to Auto. to Auto. to C- C=L" Repeat Cycles Supply End Supply End Supply End 5 DC DC AC Motor DC elec. Drive Motor Motor + Multi- motor bivrator

Time Marks /sec 2 2 2 L Pendulum Pendulum Pendulum + Elect. + Elect. Electro- + Elect. Starter Type Contact Contact Magnetic Contact

Direction horiz. horiz. vert. horiz.

Nat. Freq., Hz 1 1 4 1

F Damping, Critical 100 50 150 30 --

Trigger Level, g -- -- 0.005-0.05 -- 0.01

Start Time Delay 0.10-0.15 <0.1 <0.01 0.2 <0.2 L-

Power Supply 12 vdc 12 vdc 12 vdc 12 vdc --

Size, cm 35x4lx4l 25x23x48 18xl8x36 35x5lxll4 45x3Ox28.5

Weight, kg 27 16 9 61 22 NRC FRM 335 U.S. NUCLEAR REGULATORY COMMISSION 1 REPORT N UMBER Assigned by DDC) (7-77) NUREG/CR-1660 BIBLIOGRAPHIC DATA SHEET UCRL-15227

4. TITLE AND SUBTITLE (Add Volume No., if appropriate) 2 (Leave blank) Compilation, Assessment and Expansion of the Strong Earthquake Ground Motion Data Base 3. RECIPIENT'S ACCESSION NO.

7. AUTHORIS) 5. DATE REPORT COMPLETED C.B. Crouse, J.A. Hileman, BE. Turner, G.R. Martin MONTH IYEAR Fugro, Inc. April 1980 9. PERFORMING ORGANIZATION NAME AND MAILING ADDRESS finclude Zip Code) DATE REPORT ISSUED Lawrence Livermore Laboratory MONTH IYEAR 7000 East Avenue September 1980 Livermore, California 94550 6tLeave blank)

8. (Leave blank)

12. SPONSORING ORGANIZATION NAME AND MAILING ADDRESS (Include Zip Code) 10. PROJECT/TASK/WORK UNIT NO Site Safety Research Branch Division of Reactor Safety Research 11. CONTRACT NO. Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission FIN No. A0139 Washington, D.C. 20555 13. TYPE OF REPORT PERIOD COVERED nclusive ares) Technical

15. SUPPLEMENTARY NOTES 14. (Leave olank)

16. ABSTRACT 200 words or less) A catalog has been prepared which contains information for: (1) world-wide, ground-motion accelerograms 2 the accelerograph sites where these records were obtained, and 3 the seismological parameters of the causative earthquakes. The catalog is limited to data for those accelerograms which have been digitized and published. In addition, the quality and completeness of these data are assessed.

17. KEY WORDS AND DOCUMENT ANALYSIS 17a 'DESCRIPTORS

17b. IDENTIFIERS/OPEN-ENDED TERMS

18 AVAILABILITY STATEMENT 19 SECURITY CLASS (Tnis reporr) 21 NO OF PAGES UnclaggifiPd Unlimited 20. SE CURI TY CLASS l'Thispage) 22 PRICE Unclassified S NRC FORM 335 7 77) UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 POSTAGE AND FEES PAID U.S. NUCLEAR REGULATORY OFFICIAL BUSINESS COM MISSION PENALTY FOR PRIVATE USE. 300

< (r