SHALLOW SHEAR-WAVE STRUCTURE AND ITS EFFECTS ON BUILDING DAMAGE AT STRONG MOTION STATIONS IN TAIWAN BASED ON MICROTREMOR MEASUREMENTS

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  • TOKIMATSU Kohji
    Dept. of Architecture and Building Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • SEKIGUCHI Toru
    Dept. of Architecture and Building Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology

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  • 微動観測から推定した台湾集集地震強震観測点の表層S波速度構造とその建物被害への影響
  • ビドウ カンソク カラ スイテイ シタ タイワンシュウシュウ ジシン キョウシン カンソクテン ノ ヒョウソウ Sハ ソクド コウゾウ ト ソノ タテモノ ヒガイ エ ノ エイキョウ

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Abstract

In order to examine the local site effects on the strong motion records of the 1999 Chi-Chi earthquake in Taiwan, microtremor measurements are conducted using arrays of sensors at 11 strong motion stations. Shallow shear wave velocity profiles of these stations are estimated based on an inverse analysis of both microtremor dispersion characteristics and H/V spectra. Equivalent linear analysis is conducted using the estimated Vs profiles. It is shown that local soil conditions including nonlinear soil behavior might have had significant effects on the ground motion and performance of buildings during the earthquake.

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