BASIC STUDY ON VARIANCE OF SITE CHARACTERISTIC IN STONG MOTIONS IN KANTO REGION

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  • 関東地方における地震動地域特性のばらつきに関する基礎的検討

Abstract

 We have been investigating the site characteristics of strong motions at engineering base layer in Kanto region. The site characteristics of strong motions are obtained as the geometric averaged ratios of acceleration response spectra between the observed data and calculated values estimated by the existing empirical attenuation relations. There exist significant differences in the variances of acceleration response spectrum ratios between the mountain area and the plain field. In this study, we focus on the variances of acceleration response spectrum ratios. The analysis shows that the variance of acceleration response spectrum ratios can be reduced by the realignment of observed data with respect to the focal region. In addition, we present the possibility of effect of depth from the engineering base layer to the seismic bedrock on the variances of acceleration response spectrum ratios.

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