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Organization Title

The Site Response of Two Rock and Soil Station Pairs to Strong and Weak Ground Motion

by R.B. Darragh and A.F. Shakal

Darragh, R.B., and A.F. Shakal (1992). The Site Response of Two Rock and Soil Station Pairs to Strong and Weak Ground Motion. SMIP92 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 1-1 - 1-11.

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Abstract

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 signal amplitude.

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.