Author(s)

F.J. Sanchez-Sesma, J. Ramos-Martinez & L.E. Perez-Rocha

Abstract

The seismic response of shallow alluvial valleys F.J. Sanchez-Sesma"'*, J. Ramos-Martinez", L.E. Perez-Rocha" -"Centra de Investigation Sismica, FJBS, Carretera al Ajusco 203, Tlalpan 14200, Mexico D.F., Mexico * Instituto de Ingenieria, UN AM, Ciudad Universitaria, Apdo. 70-472, Coyoacdn 04510, Mexico D.F., Mexico The seismic response of two- and three-dimensional shallow al- luvia valleys is studied by means of two boundary integral B^is^T' • °" ^dimensional configurations the indirect BEM is used, le. diffracted and refracted waves are construc- ted in terms of single layer boundary sources. The three dimen- sional models have axial symmetry and are solved with eigen- f unctions expansions in spherical coordinates. In this case boundary conditions are satisfied in the least-squares sense Results are studied by means of frequency-space representa- ures n * :!'" *° l^ntify resonant patterns'of th

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