THE DIFFERENCES IN THE ESTIMATED STRONG MOTION WAFEFORMS DUE TO THE DIFFERENCES IN THE WAVEFORMS OF SMALL MOTIONS

Abstract

 The empirical green's function method is one of the methods of estimation of strong ground motion. This method is often used to estimate the waveform of anticipated strong earthquake using a weak earthquake motion observed at the site. However, when there are two or more candidates of observed weak motions, there is no method to evaluate the possible difference which appears in the estimated waveforms by the selection of the weak motions.
 In this study, earthquakes which occurred in a similar condition are chosen. And with the simulation of the strong motions by the empirical green's function method using the weak motions, it is investigated that relationship between weak motion and strong motion of the similarity in the waveforms.
 As a result, it turned out that variation of the simulated waveforms of strong motion is related to the peak frequencies of the weak motion used in the simulation.