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.

First Page Preview

First page PDF preview
You do not currently have access to this article.