3D Analysis of S-Wave Propagation in Soft Deposits
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 125, Issue 9
Abstract
During the 1985 Michoacan earthquake (surface-wave magnitude = 8.1), large-amplitude seismograms of extremely long duration were recorded in the lake-bed zone of Mexico City. Large amplification in soft surficial deposits has not been well understood. Ground subsidence of the soft clay deposits might heavily influence S-wave propagation. In the present study, we attempt to explain both S-wave amplification and propagation time between surface and borehole recordings under the action of gravity on the basis of a 3D nonlinear finite-element (FE) technique where a bilinear model with a Mohr-Coulomb criterion is used. We identify body-wave (S-wave) time sections in the recordings with a cross-correlation analysis. The FE simulation successfully predicts the S-wave amplification and propagation time, which cannot be explained by a purely 1D linear model. Although subsidence changes S-wave linear amplification, S-wave propagation time decreases little.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 125 • Issue 9 • September 1999
Pages: 727 - 740
History
Received: May 4, 1998
Published online: Sep 1, 1999
Published in print: Sep 1999
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