SIMPLIFIED SEPARATION TECHNIQUE OF BODY AND SURFACE WAVES IN STRONG MOTION ACCELEROGRAMS

Abstract

A simplified separation technique of body and surface waves in strong motion accelerograms have been proposed. To confirm the dispersion characteristics of surface waves the evolutionary power spectrum have been examined for Japane typical accelerograms. The parameters td, and fd, in time and frequency domain, respectively, have been defined as the separation parameters. To make sure of importance of separation, ground strain caused by body and surface waves have been analyzed for original data and its separated body and surface waves. It has been pointed out that the separated surface waves should be used spcially for estimation of local ground strain.