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DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY United States Earthquakes, 1936-1940 By Coast and Geodetic Survey Open-File report 84-936 Prepared in cooperation with National Oceanic and Atmospheric Administration, This report has not been reviewed for conformity with U.S. Geological Survey editorial standards. 1984 Preface The serial publication United States Earthquakes was initiated in 1928, 3 years after the Coast and Geodetic Survey was given authority by Congress to make earthquake investigations and reports. The present volume is a reprint of those earthquake reports published from 1936 through 1940 by the Coast and Geodetic Survey. There has been no attempt to correct or revise the material contained in the present volume. However, some additions and corrections to previous issues are listed in reports for the following years: 1936, p. 44; 1937, p. 54; 1938, pp. 57-58; 1939, p. 55; and 1940, p. 54. At the present time, issues for the years 1941 through 1945 are out of print. Because the earthquake reports contained in these issues are essential to the com plete seismic history of this country, a limited number of copies will be made available in the future under the title, United States Earthquakes, 1941-1945. Copies of the annual United States Earthquakes series for the years 1946-1966 are available from the National Earthquake Information Center, Coast and Geodetic Survey, Rockville, Md. 20852. Those desiring copies of the reprint United States Earthquakes, 1928-1935, may obtain them by writing the Superintendent of Documents, Government Printing Office, Washington, D.C 20402. The price of this paperbound reprint is $1.75. 111 Serial No. 610 UNITED STATES EARTHQUAKES 1936 By FRANK NEUMANN Senior Mathematician U. S. DEPARTMENT OF COMMERCE COAST AND GEODETIC SURVEY WASHINGTON : 1938 CONTENTS Page Introduction._.____-___-_____--________._____--_____---___----_--- 1 Instrumental results_______________________________________________ 4 Noninstrumental results.___________________________________________ 6 Earthquake activity in the various States.______________________ 6 Northeastern region-______-___--____-_______--______.-__-_-_-_ 8 Eastern region._______________________________________________ 8 Central region.___________-_____-_______--__-____-_--__-_-----_ 8 Western Mountain region__________________--__________--_-_--_ 10 California and western Nevada___--_____________________________ 12 Washington and Oregon._______________________________________ 19 Alaska ____________-__________________-____-_-__---_-_----_--- 23 Hawaiian Islands-________---___-_-____-____---_-----___--__--- 24 Philippine Islands._______________-__--__-__---__----__----_--- 25 Puerto Rico______-----_------__----------------------_-------- 25 Panama Canal Zone_______________-_.-________-__--__-_---___-- 25 Miscellaneous activities.______-_____--____--_____--__--_-_--------- 26 Seismological observatory results._________________---__----___--__-_ 27 Strong-motion seismograph results.______________________---_----__-- 31 introduction. ______-___-____________--_-__-_--______-_------_- 31 List of shocks recorded and records obtained on strong-motion seismo graphs in 1936___--_--_---_-_----_-----------------------_-- 33 The Helena, Mont., earthquake of February 13, 1936._-._-______-_ 33 The southern California earthquake of February 23, 1936______--_-_ 35 The Panama Canal Zone earthquake of May 6, 1936_-----_-_-_---- 35 The earthquake of June 3, 1936, off Cape Mendocino._____________ 36 The Helena, Mont., earthquake of June 11, 1936-.-- ____________ 38 The Helena, Mont., earthquake of June 12, 1936________-____--__-- 38 The east central California earthquake of October 10, 1936_______-- 38 Summary of strong-motion seismograph data for the year 1936____-- 40 Instrumental constants of strong-motion seismographs in 1936______ 41 List of strong-motion seismograph stations, 1936-_________________ 42 Descriptions of strong-motion seismograph stations._______________ 43 Tilt observations._________________________________________________ 44 Additions arid corrections to previous publications.____________________ 44 ILLUSTRATIONS 1. Destructive and near destructive earthquakes of the United States through 1936______________________________________________ iv 2. Earthquake epicenters, 1936-------_---__________________________ 7 3. Area affected by the Texas panhandle earthquake of June 19, 1936. _ 9 4. Isoseismal map of the Texas panhandle earthquake of June 19, 1936. _ 10 5. Areas affected by the California earthquakes of February 23, May 10 and June 3, 1936___-------_-_-_-___________________________ 14 6. Area affected by the Oregon-Washington "State-line" earthquake of July 15, 1936________________________________________________ 21 7. Tracings of Helena accelerograph record of February 13, Colton accelerograph and displacement-meter records of February 23, and Miraflores accelerograph record of May 6, 1936__________________ 34 8. Tracing of Ferndale accelerograph record of June 3, 1936____________ 37 9. Tracings of Helena accelerograph records of June 11 and 12, and Bishop accelerograph record of October 10, 1936_-_-__ _ 39 10. Tilt curves for 1936___________________________________ 45 m DESTRUCTIVE AND NEAR DESTRUCTIVE EARTHQUAKES OF THE UNITED STATES THROUGH 1936 COMPILED BY U. S. COAST AND GEODETIC SURVEY U L F OF MEXICO FIGURE 1. Destructive and near-destructive earthquakes in the United States through 1936. UNITED STATES EARTHQUAKES, 1936 INTRODUCTION This publication is a summary of earthquake activity in the United States and the regions under its jurisdiction for the calendar year 1936. The history of the more important shocks of the country ap pears in two publications of the Bureau, Special Publication No. 149, Earthquake History of the United States Exclusive of the Pacific Region, and Special Publication No. 191, Destructive and Near Destructive Earthquakes in California and Western Nevada, 1769- 1933. The former publication has been revised and numbered Serial 609 and should be available for distribution about the same time this publication is released. It will cover the history of the more important shocks through 1937 and will include chapters on the Washington-Oregon region and Alaska. The title will be slightly changed so that it will clearly indicate that, combined with the Cali fornia publication, it will form a complete earthquake history of the country, including Alaska, through 1937. The new title of Serial No. 609 will be '/Earthquake History of the United States. Part I: Con tinental United States (Exclusive of California and Western Nevada) and Alaska." When a new edition of Special Publication No. 191 becomes necessary, it will also bear Serial No. 609 and be known as Earthquake History of the United States. Part II: Destructive and Near-Destructive Earthquakes in California and Western Nevada. The history of minor activity is covered largely in a series of refer ences listed in Special Publication No. 149, in recent serial reports of the U. S. Coast and Geodetic Survey, in the Holden and McAdie catalogs ! of the Pacific coast earthquakes, and in a forthcoming publication of the Seismological Society of America. The last three of these publications also give very detailed information for all California earthquakes. Earthquakes of volcanic origin in the Hawaiian and Philippine Islands are not included, and only severe shocks are included in the case of the Philippine Islands, as complete reports are published by local seismological institutions as indicated in the lists of earthquakes for those regions. Earthquakes adjacent to the United States and felt within its borders are described only in a general way when de tailed descriptions are published elsewhere. Beginning with this issue an epicenter map of the United States will appear in each annual report of the series showing all of the more im portant earthquakes of the country through the year covered by the report. Cooperation of investigators solicited. -In order that these publica tions may be as complete as possible in the more important details of i Smithsonian Miscellaneous Collections, 1089. A Catalog of Earthquakes on the Pacific Coast, 1769- 1897. Edward S. Holden. Smithsonian Miscellaneous Collections, 1721. Calatog of Earthquakes on the Pacific Coast, 1897-1906. Alexander G. McAdie. 2 U. S. COAST AND GEODETIC SURVEY earthquakes and in references, it is desired that investigators cooperate to the fullest extent, as such cooperation will be to the mutual ad vantage of everyone concerned. The Bureau is willing to furnish investigators all information at its disposal, consisting principally of seismographic records and post-card questionnaires obtained in many instances through special canvassing of affected areas. In return it is requested that advance notices be furnished of results obtained so that abstracts and references may be inserted in these reports. An ad vance notice of a planned investigation might save considerable over lapping of effort and would give wider publicity to the work of the investigator. The noninstrumental information has been furnished by a large number of individuals and organizations whose voluntary cooperation has made it possible to prepare descriptions of the earthquakes of this country with a completeness and accuracy never before attained. Lack of space prohibits giving individual credit to all of the coopera- tors. The principal sources of information are as follows: United States Weather Bureau. Central office of the