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Nonstationary stochastic simulation of strong ground motion time histories including natural variability; application to the K-net Japanese database

Guillaume Pousse, Luis Fabian Bonilla, Fabrice Cotton and Ludovic Margerin
Nonstationary stochastic simulation of strong ground motion time histories including natural variability; application to the K-net Japanese database
Bulletin of the Seismological Society of America (December 2006) 96 (6): 2103-2117

Abstract

Physical models that can be used to obtain realistic accelerograms usually require a thorough knowledge of the source, path, and site effects. In addition, the computational resources needed might be expensive. Thus, empirical models still represent a good alternative for simulating strong ground motion. In this work, we modify and improve the model developed by Sabetta and Pugliese (1996). This new method models the time-domain accelerogram based on the assumption that the phase is random and that the time envelope can be represented by the so-called average instantaneous power. This is, in turn, described as a lognormal distribution for P and S waves combined with an algebro-exponential function representing the envelope of coda waves. In addition, the frequency content of the signal is nonstationary and follows a modified omega -square model. The method depends on four common indicators in earthquake engineering: peak ground acceleration, strong-motion duration, Arias intensity, and central frequency. These indicators are empirically connected to a given database by means of ground-motion prediction equations. In this study we calibrate the model using Japanese data recorded by the K-net array, which has high-quality digital accelerograms and station-site conditions characterized by geotechnical measurements. In addition, this technique permits the inclusion of the uncertainty of the model parameters to take into account the ground-motion natural variability in the stochastic generation of the time histories. The main goal of this work is to provide the earthquake engineering community with a flexible tool to generate realistic accelerograms for dynamic studies.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 96
Serial Issue: 6
Title: Nonstationary stochastic simulation of strong ground motion time histories including natural variability; application to the K-net Japanese database
Affiliation: Institut de Radioprotection et de Surete Nucleaire, Fontenay-aux-Roses, France
Pages: 2103-2117
Published: 200612
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 60
Accession Number: 2007-010937
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Secondary Affiliation: Universite Joseph Fourier, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200707
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