A METHOD FOR ESTIMATING LONG PERIOD GROUND MOTION IN A BASIN

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  • 盆地内のやや長周期地震動の簡便な推定手法
  • ボンチ ナイ ノ ヤヤ チョウ シュウキ ジシンドウ ノ カンベン ナ スイテイ シュホウ

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Abstract

In this paper, a method for estimating long period ground motion in a basin is proposed. At first, we assume that the ground motion consists of direct waves from the seismic source and basin-induced surface wave. Former ground motion is calculated by flat layer model, those are determined from the underground structure below a site. Amplitude of a basin-induced surface wave is calculated from the energy flux of the incident ground motion at the basin edge. Then new method is applied to a simple basin model. Estimated ground motions by this method are very close to the ground motion, those are calculated by 3-D boundary element method. Finally, ground motion at Fukushima and Amagasaki station of CEORKA during 1995 Hyogo-ken Nanbu earthquakes is estimated. Estimated ground motions and observed ones are very close both amplitudes and phases.

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