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Simulating strong ground motion from complex sources by reciprocal Green functions

Eisner, L. and Clayton, R. W. (2005) Simulating strong ground motion from complex sources by reciprocal Green functions. Studia Geophysica et Geodaetica, 49 (3). pp. 323-342. ISSN 0039-3169.

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We have developed a method to calculate site and path effects for complex heterogeneous media using synthetic Green’s functions. The Green’s functions are calculated numerically by imposing body forces at the site of interest and then storing the reciprocal Green’s functions along arbitrary finite-fault surfaces. By using reciprocal Green’s functions, we can then simulate many source scenarios for those faults because the primary numerical calculations need be done only once. The advantage of the proposed method is shown by evaluation of the site and path effects for three sites in the vicinity of the Los Angeles basin using the Southern California Velocity Model (version 2.2, Magistrale et al., 2000). In this example, we have simulated 300 source scenarios for 5 major southern California faults and compared their responses for period longer then 3 seconds at the selected sites. However, a more detailed comparison with strong motion records will be necessary before a particular hazard assessment can be made. For the tested source scenarios the results show that the variations in the peak velocity amplitudes and durations due to a source scenarios are as large as variations due to a heterogeneous velocity model.

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Clayton, R. W.0000-0003-3323-3508
Additional Information:© 2005 StudiaGeo s.r.o., Prague. Received: April 22, 2003; Revised: January 15, 2005; Accepted: April 19, 2005. The authors would like to thank Hiroo Kanamori, Tom Heaton, Ned Field, Jiří Zahradník and three anonymous reviewers and the associate editor for their valuable suggestions and discussion during the study. Many of the figures were made with GMT (Wessel and Smith, 1991). This research was supported by the Southern California Earthquake Center. SCEC is funded by NSF Cooperative Agreement EAR-8920136 and USGS Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-97AG01718. The SCEC contribution number for this paper is 558. Contribution number 8821 from the Division of Geological and Planetary Sciences, California Institute of Technology.
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:full waveform modeling; seismic hazard; finite source; rupture propagation; hazard assessment; finite difference; Los Angeles Basin
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Other Numbering System NameOther Numbering System ID
Southern California Earthquake Center (SCEC)558
Caltech Division of Geological and Planetary Sciences8821
Issue or Number:3
Record Number:CaltechAUTHORS:20121001-104059099
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34586
Deposited By: Tony Diaz
Deposited On:01 Oct 2012 18:53
Last Modified:03 Oct 2019 04:20

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