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(CAV) and JMA Instrumental Seismic Intensity (IJMA) Using the PEER-NGA Strong Motion Database

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(CAV) and JMA Instrumental Seismic Intensity (IJMA) Using the PEER-NGA Strong Motion Database PACIFIC EARTHQUAKE ENGINEERING RESEARCH CENTER PACIFIC EARTHQUAKE ENGINEERING Analysis of Cumulative Absolute Velocity (CAV) and JMA Instrumental Seismic Intensity (IJMA) Using the PEER-NGA Strong Motion Database Kenneth W. Campbell EQECAT, Inc. and Yousef Bozorgnia Pacific Earthquake Engineering Research Center University of California, Berkeley PEER 2010/102 FEBRUARY 2010 Analysis of Cumulative Absolute Velocity (CAV) and JMA Instrumental Seismic Intensity (IJMA) Using the PEER-NGA Strong Motion Database Kenneth W. Campbell EQECAT, Inc. Yousef Bozorgnia Pacific Earthquake Engineering Research Center University of California, Berkeley PEER Report 2010/102 Pacific Earthquake Engineering Research Center College of Engineering University of California, Berkeley February 2010 ABSTRACT This report summarizes the results of a study of cumulative absolute velocity (CAV) and Japan Meteorological Agency instrumental seismic intensity (IJMA) with the objectives of (1) analyzing the relationship between IJMA and the standardized version of CAV (standardized CAV) and our variant of this parameter (CAVS) that includes the operating basis earthquake (OBE) exceedance criteria proposed by the U.S. Nuclear Regulatory Commission for shutting down a nuclear power plant after an earthquake; (2) developing a ground motion prediction equation (GMPE) for CAVS and the geometric mean horizontal component of CAV (CAVGM), and (3) developing a GMPE for IJMA. All of these analyses used the Pacific Earthquake Engineering Research Center Next Generation Attenuation (PEER-NGA) strong motion database. We explored the relationship between CAVS and IJMA using both the full PEER-NGA database and a subset of that database (the CB08 subset) that we previously used to develop GMPEs for peak ground motion and linear-elastic and inelastic response spectra. We used only the CB08 subset of the PEER-NGA database to develop GMPEs for CAVGM, CAVS and IJMA in order to limit the analysis to those recordings that were considered to be most reliable. Thus far, we have found that CAVGM has less aleatory uncertainty than any of the peak ground motion and response-spectral parameters we have studied and that the aleatory uncertainty associated with CAVS is among the smallest. iii ACKNOWLEDGMENTS This project was partially funded by the International Atomic Energy Agency (IAEA) as part of the activities of Seismic Working Group 1 (WG1) of the Extra Budgetary Program (EPB). Dr. Bozorgnia’s participation was partially sponsored by the Pacific Earthquake Engineering Research Center (PEER). Publication of this report was also supported by PEER. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the sponsors. We would like to thank Dr. Yoshimitsu Fukushima and Prof. Saburoh Midorikawa for providing us with a description of recently published ground motion prediction equations for JMA instrumental seismic intensity from the Japanese literature and Dr. Fumio Yamazaki for providing us with original line drawings demonstrating the calculation of JMA instrumental seismic intensity. iv CONTENTS ABSTRACT.................................................................................................................................. iii ACKNOWLEDGMENTS ........................................................................................................... iv TABLE OF CONTENTS ..............................................................................................................v LIST OF FIGURES .................................................................................................................... vii LIST OF TABLES ....................................................................................................................... xi 1 INTRODUCTION .................................................................................................................1 2 PARAMETER DEFINITIONS............................................................................................5 2.1 Cumulative Absolute Velocity (CAV) ...........................................................................5 2.2 JMA Instrumental Seismic Intensity (IJMA)....................................................................7 3 DATABASE .........................................................................................................................11 3.1 Strong Motion Database ...............................................................................................11 3.2 Ground Motion Components........................................................................................12 3.2.1 Horizontal Geometric Mean of CAV (CAVGM) ..............................................12 3.2.2 Maximum Standardized CAV (CAVS) ............................................................13 3.2.3 JMA Instrumental Seismic Intensity (IJMA)......................................................15 4 RELATIONSHIP BETWEEN CAVS AND IJMA ..............................................................17 4.1 Median Model...............................................................................................................17 4.2 Aleatory Uncertainty Model.........................................................................................18 4.3 Relationship to Qualitative Damage Descriptions........................................................21 4.3.1 Qualitative Damage Descriptions in the JMA Intensity Scale.........................21 4.3.2 Qualitative Damage Descriptions in the MMI Intensity Scale ........................21 4.3.3 Correlation of CAVS with Qualitative Damage Descriptions in the JMA and MMI Intensity Scales .......................................................................................24 5 GROUND MOTION PREDICTION EQUATIONS........................................................27 5.1 Prediction Equations for CAVGM and IJMA ...................................................................27 5.1.1 Median Model..................................................................................................27 5.1.2 Aleatory Uncertainty Model............................................................................30 5.1.3 Model Evaluation.............................................................................................35 v 5.2 Prediction Equation for CAVS......................................................................................42 5.2.1 Median Model..................................................................................................42 5.2.2 Aleatory Uncertainty Model............................................................................43 5.2.3 Model Evaluation.............................................................................................43 6 USE OF CAV FILTER IN PROBABILISTIC SEISMIC HAZARD ANALYIS..........49 6.1 Hazard Integral with CAV Filter..................................................................................49 6.2 Example Hazard Analysis with CAV Filter .................................................................54 7 DISCUSSION.......................................................................................................................57 7.1 Comparison with Existing Relationships .....................................................................57 7.1.1 Relationships for CAVS and Standardized CAV .............................................57 7.1.2 Relationships for CAV and CAVGM ................................................................58 7.1.3 Relationships for IJMA.......................................................................................60 7.2 Evaluation of Aleatory Uncertainty..............................................................................61 7.3 Impact of Database Selection .......................................................................................63 7.4 Correlation with Qualitative Assessments of Damage .................................................64 7.5 Application to Other Regions.......................................................................................65 8 CONCLUSIONS..................................................................................................................67 REFERENCES.............................................................................................................................69 vi LIST OF FIGURES Fig. 2.1 Definitions of CAV and standardized CAV showing their evolution with time. Hypothetical acceleration time series is that given in EPRI (1991). Acceleration threshold for determining when the value of standardized CAV in any one-second interval is included in the summation is 0.025g. Modified from EPRI (1988)...............6 Fig. 2.2 Calculation of JMA instrumental seismic intensity: (a) applying a band-pass filter in the frequency domain, (b) summing time segments exceeding a reference PGA value of the absolute value of the geometric mean of the three components of the filtered acceleration time series, and (c) accounting for the effect of duration on PGA. Modified from Karim and Yamazaki (2002). .................................................................9 Fig. 3.1 Distribution of recordings with respect to moment magnitude (M) and rupture distance ( RRUP ) for the CB08 subset of the PEER-NGA database used in the analysis of CAVGM and IJMA (upper left) and CAVS (lower left), and the full PEER-NGA database used in the analysis of CAVGM and IJMA (upper
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