Simulation of strong ground motions recorded during the 1985 Michoacan, Mexico and Valparaiso, Chile earthquakes

Paul Somerville, Mrinal Sen, Brian Cohee

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74 Citations (Scopus)

Abstract

The purpose of this study is to develop and test a procedure for simulating acceleration time histories of large subduction earthquakes. The ground motions of the large event are obtained by summing contributions from fault elements to simulate the propagation of rupture over the fault surface. The procedure has been tested against the recorded strong ground motions of the Mw = 8.0 Michoacan, Mexico, and Valparaiso, Chile, earthquakes of 1985. We find that models of heterogeneous slip in these events derived by other investigators from the analysis of teleseismic and near-source velocity seismograms also explain the shorter period motions of the recorded accelerograms. The procedure is applied in a companion paper to estimate strong ground motion characteristics in the Pacific Northwest region of the US from hypothesized Mw = 8 subduction earthquakes on the Cascadia plate interface. -from Authors

Original languageEnglish
Pages (from-to)1-27
Number of pages27
JournalBulletin - Seismological Society of America
Volume81
Issue number1
Publication statusPublished - Feb 1991
Externally publishedYes

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