Source location and valley shape effects on the P–SV near displacement field using a boundary integral equation–discrete wavenumber representation method

Abstract

We use a numerical simulation to investigate the response of sediment‐filled valleys to P–SV seismic excitation. The calculation is carried out using the discrete wavenumber–boundary integral equation method. We study in particular the case of explosion sources located within a basin or in its vicinity. We show that large amplification or defocusing effects are related to the source location and to the shape of the basin. In the case of complex basins made up of several sedimentary layers, waves propagating along the various interfaces play an important role in shaping the seismic response of the basin. Copyright © 1991, Wiley Blackwell. All rights reserved