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Simulation of the seismic response of a 2D sedimentary basin: a comparison between the indirect boundary element method and a hybrid technique

Instituto Andaluz de Geofísica y Prevención de Desastres Sísmicos Universidad de Granada, 18080 Granada, Spain
Departamento de Física Aplicada Universidad de Almería Crtra. Sacramento, Cañada San Urbano, 04120 Almería, Spain
Disaster Prevention Research Institute Kyoto University, Gokasho, Uji Kyoto 611 Japan
Institut fuer Geophysik ETH-Hoenggerberg, CH-8093 Zurich, Switzerland
Instituto de Ingeniería UNAM Cd. Universitaria, Coyoacán 04510 México D.F. México
Centro de Investigación Sísmica, A.C. Carr. al Ajusco 203 Col. H. de Padierna, Tlalpan 14200 México D.F. México

Abstract

The seismic response of a two-dimensional sedimentary basin is studied with the indirect boundary element method (IBEM) and compared with the results of a hybrid technique that combines modal summation and the finite-difference technique. To perform this numerical experiment we used the "observed" ground motion at the edge of the basin, computed independently with the hybrid technique. This ground motion is used to estimate the apparent incoming wave field. The estimation is based on a simplified polarization analysis that led us to select time windows for various incident plane-wave types. The numerical simulations with IBEM gave results in the time and frequency domain that compare well with those of the hybrid approach. It suggests that a realistic simulation of strong ground motion is possible using two-dimensional wave propagation modeling together with an estimate of the incident wavefield. This estimate can be obtained with a polarization analysis of observed ground motion at a station located on bedrock, as long as the different wave types can be separated in time and frequency.

This article has been cited by other articles:

				On the Horizontal-to-Vertical Spectral Ratio in Sedimentary Basins Bulletin of the Seismological Society of America, August 1, 2000; 90(4): 1101 - 1106.