Development of stochastic ground movement: study on SMART-1 array data

Abstract

The purpose of this paper is to estimate the possible effects of the source as well as the local soil characteristics on the spectral characteristics of ground motions. A stochastic soil amplification function was first developed. The parameters that control the spectral shape of ground motion were depth of soil deposit, soil density and shear modulus, corner frequency of the source as well as the high frequency decay rate of acceleration. The result of the model was compared to the data record by SMART-1 array. The development of seismic design spectrum was also discussed based on the proposed ground motion model. It is concluded that the local soil density, depth of soil deposit and the source corner frequency are the most significant factors to the influence of design spectrum. With the proposed ground motion model, a method to predict the design spectrum for a given earthquake magnitude can be constructed.