Abstract
It is well known that landform has a strong influence on the dynamic properties of the ground. The objective of this study is to clarify the effect of a slope on the dynamic properties of diluvial terrace based on ground investigations, seismic motion observations and two dimensional finite element analyses, by choosing a target area that has a landform typical to the southern Kanto plain. Three sets of finite element analysis model have been constructed; the first one is based on the detailed ground investigation and has a weak soil at the slope between the terrace and the lowland, the second one does not have a weak soil, and the third one consists of a homogeneous soil. Through this study, the followings were found:(1) Due to the weak soil at the slope, amplification becomes very large, but the area of influence is relatively small.(2) Amplification due to ground irregularity is relatively small, but the area of influence is fairly large.(3) The mechanism of this large area of influence due to irregularity can be explained by the generation of surface waves at the slope.
