Azimuth-Dependent Site Amplification

Abstract

The strong motion accelerograrns recorded at two stations of SMART-1 array have been analyzed to investigate azimuth-dependent site amplification. Fifteen earthquakes which triggered both accelerographs at rock site E02 and soil site E01 were selected for this study. We measure the spectral ratio of E01 to E02 in a window which includes direct S waves. Since ground motions at the rock site are less modified by the site effects and E02 and E01 are only 2 km apart, the spectral ratio of the soil site to the rock site will cancel most of source and raypath effects and reflect the site amplification of the soil site.

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