Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; June 1995; v. 85; no. 3; p. 890-899
© 1995 Seismological Society of America
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Seismic response of shallow alluvial valleys: The use of simplified models

J. L. Rodríguez-Zúñiga, F. J. Sánchez-Sesma and L. E. Pérez-Rocha

Centro de Investigación Sísmica, A.C. Carretera al Ajusco 203, Col. H. de Padierna, Tlalpan 14200 México D.F., México
Instituto de Ingeniería, UNAM Cd. Universitaria, Apdo. 70-472, Coyoacán 04510 México D.F., México

Abstract

A method is proposed to approximately compute the seismic response of shallow three-dimensional (3D) alluvial valleys. It is based on the exact solution for a simple configuration. Namely, the antiplane response of a rectangular deposit with a moving rigid base. In such a solution, which is used as a framework for our approximations, the spectral signature of locally generated surface waves is explicit. Thus, an approximate expression is constructed to separately account for one-dimensional (1D) response and lateral effects. Results are presented for two- and three-dimensional cases. Comparisons are provided with rigorous solutions as well. Our formulas allow for fast computations.






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