Strong-Motion Array Observation and Evaluation of Site Effects in Odawara City, Japan

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  • MATSUOKA Masashi
    Department of Built Environment, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology Remote Sensing Technology Center of Japan
  • MIDORIKAWA Saburoh
    Department of Built Environment, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • UCHIYAMA Yasuo
    Department of Built Environment, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology Technology Research Center, Taisei Corporation

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  • 小田原市内での強震観測とそれに基づく地盤特性の検討
  • オダワラ シナイ デ ノ キョウシン カンソク ト ソレニ モトズク ジバン

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Abstract

A dense strong-motion array in the central part of Odawara city, Japan has been installed for understanding the detailed spatial distribution of ground motion characteristics. To evaluate the local site effect on the observed earthquake motions, the spectral ratios at soil sites with respect to two reference sites are calculated for several events. When the reference site KNB located about 3km from the soil sites is used, the spectral ratios are scattered in different events. For the reference site SRY which is very close to the soil sites, however, the spectral ratios are stable. One possible interpretation for the scatter in the ratios with respect to KNB may be large attenuation of seismic waves in the propagation path between KNB and the other sites. The spectral ratios with respect to the reference site SRY are compared to the horizontal/vertical ratios of microtremor in order to clarify the applicability of microtremor to site effect evaluation. Both ratios show spectral peaks at the same periods. The correlation is also found in levels of both ratios at the peaks.

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