by L.H. Mejia, J.I. Sun, S. Salah-mars, Y. Moriwaki and M. Beikae
Mejia, L.H., J.I. Sun, S. Salah-mars, Y. Moriwaki and M. Beikae (1992). Nonlinear Dynamic Response Analysis of Lexington Dam. SMIP92
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 10-1 - 10-14.
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The site response to strong and weak ground motion depends largely on the subsurface conditions
at the soil site for the two rock-soil station pairs studied. The first station pair consists
of a soft-soil site and a sandstone/shale site (Treasure Island and Yerba Buena Island). For
strong motion, the soft-soil site is amplified by a factor of about 3 over the rock site from
0.5 to 2.0 Hz. The amplification is much higher for weak motion and suggests a dependence on
A second station pair near Gilroy consisting of a stiff-soil site and a sandstone site was
studied with contrasting results. Unlike the results for the soft-soil study above, the
estimated stiff-soil site response is not significantly different for strong and weak motion
from 0.5 to 2.0 Hz.