Abstract
On the sedimentary basin, the characteristics of ground motion varies with incident angle and azimuth angle of the seismic wave due to the complicated soil structure. Especially, the predominant period of the seismic ground motion, which is very important in the design of high-rise buildings, often varies with the direction of the hypocenter. In this study, we focus the effect of sedimentary basin structure on dynamic characteristics of seismic ground motion, using the three dimensional finite difference method and the reciprocity theorem of Green's function. We study especially focusing effect and trapping effect of seismic waves. We also discuss the fluctuation of predominant period for the seismic design of high-rise buildings.
