気象庁1倍強震計記録を用いた速度応答スペクトルの地域特性

概要

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This paper presents the method for estimating the site amplitude amplification factors in terms of period by analyzing sufficiently large number of the JMA's low-magnification seismograph records observed during five earthquakes. The effects of earthquake factors and local soil conditions on velocity response spectra of 0.1 % damping in the period range from 2 sec to 20 sec were clarified by using regression model. For regression coefficients, dummy variables representing soil condition at each site and component of records were introduced in addition to the epicentral distance. The observed spectra corrected for the geometrical spreading of surface waves and attenuation factor were compared with the predicted spectra. The statistical model presented here was confirmed to be an effective tool for predicting the velocity response spectra. It was found that the site amplification factors sometimes differ more than 10 times from the standard value and they depend strongly on period at some sites.
日本自然災害学会の論文
1991-12-31