Two-dimensional ground motion at a soft viscoelastic layer/hard substratum site in response to SH cylindrical seismic waves radiated by deep and shallow line sources-II. Numerical results

Details Two-dimensional ground motion at a soft viscoelastic layer/hard substratum site in response to SH cylindrical seismic waves radiated by deep and shallow line sources-II. Numerical results Two-dimensional ground motion at a soft viscoelastic layer/hard substratum site in response to SH cylindrical seismic waves radiated by deep and shallow line sources-II. Numerical results

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.163..192g&link_type=abstract

Geophysical Journal International, Volume 163, Issue 1, pp. 192-224.

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We consider, using theory and associated synthetic seismograms, the seismic response of a site comprising a horizontal, homogeneous, soft viscoelastic layer of infinite lateral extent overlying, and in welded contact with, a homogeneous, hard elastic substratum of half-infinite radial extent. We show that for shear-horizontal motion: (1) coupling to Love modes is all the weaker the deeper the source (modelled as a line, assumed to lie in the substratum) is from the lower boundary of the soft layer, (2) for a line source close to the lower boundary of the soft layer, the ground response is characterized by possible beating phenomena, and is of significantly longer duration than for excitation by cylindrical waves radiated by deep sources. Numerical applications of the theory show, for instance, that a line source, located 40 m below the lower boundary of a 60-m-thick soft layer in a hypothetical Mexico-City-like site, radiating a SH pulse of 4 s duration, produces substantial ground motion during 200 s, with marked beating, at an epicentral distance of 3 km. Results from this modelling study are supported by field examples taken from published literature.

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