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Bulletin of the Seismological Society of America; April 1988; v. 78; no. 2; p. 436-450
© 1988 Seismological Society of America
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Ground motion on stratified alluvial deposits for incident SH waves

MIGUEL A. BRAVO, FRANCISCO J. SÁNCHEZ-SESMA and FRANCISCO J. CHÁVEZ-GARCÍA

INSTITUTO DE INGENIERÍA, UNAM CD. UNIVERSITARIA, APDO. 70-472, COYOACÁN 04510, MÉXICO, D.F. México
FUNDACIÓN JAVIER BARROS SIERRA, A.C. CAMINO AL AJUSCO 203 COL. HÉROES DE PADIERNA, TLALPAN 14200, MÉXICO, D.F. México

Abstract

A boundary method is applied to study the response of a two-dimensional horizontally stratified deposit of arbitrary shape under the incidence of SH waves. The procedure combines the line source method with a discrete wavenumber representation for the stratified part in terms of propagator matrix. Comparison of results for a circular, nonhomogeneous deposit with those obtained with the finite element method shows excellent agreement.

The response of a basin with two strata is analyzed. Variation of results as a function of incidence angle is presented for several frequencies. Transfer functions at several points on the surface of the deposit are obtained for vertical incidence and comparison with results from a one-dimensional analysis show significant differences. Time response for an incident Ricker wavelet clearly shows important effects due to lateral heterogeneity.




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