EFFECTS OF IRREGULAR GROUND ON VERTICAL MOTION AMPLIFICATION DURING EARTHQUAKES

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  • 地震硯測に基づく不整形地盤による上下動増幅要因の検討
  • 地震観測に基づく不整形地盤による上下動増幅要因の検討
  • ジシン カンソク ニ モトヅク フセイケイ ジバン ニ ヨル ジョウゲドウ ゾウフク ヨウイン ノ ケントウ

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Abstract

For years, earthquake ground motion has been observed at 6 stations in Kamakura city, Japan. Among them, two stations of NMD and ONR have been found to show larger vertical motion. Especially at NMD, a maximum acceleration ratio between vertical and horizontal motions is sometimes exceeds 1, with a constant predominant period of about 0.25sec for both vertical and horizontal motions. A 2-D BEM is applied to characterize ground motion at both stations, with a result showing that steep slopes of bed rocks under the surface layers play important but different roles for both cases.

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