不均質・不整形性および入力コヒーレンスが地震動特性に及ぼす影響評価 : 釧路地方気象台敷地の場合

概要

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The site amplification characteristics of ground motion at Kushiro J. M. A. site are investigated. The transfer function of surface layer to bedrock calculated from the seismic observation array data shows no pointed peaks, no clear dips, higher amplification in high frequency. This real phenomena can not be simulated with the homogeneous multi-layered model subjected to incident plane waves. This paper presents that the stochastic simulation using two dimensional finite element model taking account of the effects of the spatial variability of soil properties, spatial coherency of incident waves, and topographical condition. The results of stochastic simulation of transfer function is good coincident with that of the observation data.
1995-10-30