半球形軟弱沖積層地盤の地震応答評価 : 平面SH波入射の場合

概要

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This paper presents the three-dimensional responses on soft semi-spherical alluvial deposits under incidence of plane SH waves. In this analysis, we modify the wave potential functions to estimate the exact solution without great computational capacity and cost. The computed results show that the seismic responses depend strongly on the alluvial deposit depth varying along the curved boundary. It is found that the scattering waves due to the curved boundary induce surface waves in alluvial deposits, which are more developed as the incident angle decreases. Seismic responses show significant variations with the incident angle, station location and impedance contrast ratio even for the simple idealized deposit model. The above results suggest the formation of seismic ground motions in three-dimensional soft alluvial deposits with topographic irregular boundary.
1992-05-30