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A multidimension source model for generating broadband ground motions with deterministic 3D numerical simulations

Wang Xiangchao, Wang Jinting, Zhang Lei, Li Shuai and Zhang Chuhan
A multidimension source model for generating broadband ground motions with deterministic 3D numerical simulations
Bulletin of the Seismological Society of America (January 2021) 111 (2): 989-1013

Abstract

A multidimension source model for generating broadband ground motions with deterministic 3D numerical simulations is proposed in this article. In this model, the source is composed of several superimposed layers, and the total seismic moment is assigned to these layers in different proportions. Each layer exactly fills up the seismic fault and is uniformly divided into subsources with size decreased progressively to reflect different levels of rupture details. Hence, the proposed multidimension source model may consider the realistic rupture process of an earthquake, that is, the spatial and temporal heterogeneity of source parameters, and generate broadband ground motions. To verify this source model, the 1994 Northridge earthquake is simulated with four multidimension source models, based on different source inversion results. The amplitudes, durations, and spectral characteristics of the observed ground motions of the 1994 Northridge earthquake are respectably reproduced in a range of frequencies up to 5 Hz. In addition, a scenario earthquake is also simulated with four multidimension source models, with different synthetic rupture process. The simulated ground motions of the scenario earthquake are generally in good agreement with the Next Generation Attenuation-West 2 ground-motion prediction equations. This demonstrates that it is promising to simulate realistic broadband ground motions of strong earthquakes with a proper source description and realistic Earth models.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 111
Serial Issue: 2
Title: A multidimension source model for generating broadband ground motions with deterministic 3D numerical simulations
Affiliation: Tsinghua University, Department of Hydraulic Engineering, Beijing, China
Pages: 989-1013
Published: 20210112
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 60
Accession Number: 2021-024390
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N34°00'00" - N35°00'00", W119°00'00" - W118°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202117
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