Site effects in Mexico City eight years after the September 1985 Michoacan earthquakes |
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| Authors: | Francisco J Chvez-García Pierre-Yves Bard |
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| Institution: | Francisco J. Chávez-García,Pierre-Yves Bard, |
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| Abstract: | The purpose of this paper is to take a comprehensive look at site effects in Mexico City for the 1985 Michoacan earthquake. We examine, successively, 1D and 2D models. For the latter, we consider in detail both large scale and small scale heterogeneities, using extensively the Aki-Larner wave propagation method, in the version given by Bard and Gariel. In particular, we make a critical review of the different explanations proposed for the large duration of strong ground motion in the lake zone. Our purpose is two-sided. We first outline the difference between what is well established and what remains still unexplained regarding the seismic response of Mexico City basin. On the other hand, we wish to make explicit the conditions that the proposed models require to explain strong motion duration. Our results allow us to qualify the models proposed to date and to point out what could be the experiments and the new data required to find a truly satisfactory explanation of strong ground motion at Mexico City. |
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| Keywords: | site effects Mexico City numerical simulation large and small scale effects |
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