STOCHASTIC CHARACTERISTIC OF SITE AMPLIFICATION FACTOR AND ITS EFFECT ON EARTHQUAKE GROUND MOTION

Abstract

In this study, by using simultaneous observation record at neighbouring earthquake ground motion observation stations, the variations of the site amplification factors was evaluated with IBR003 earthquake ground motion observation stations in Ibaraki prefecture. Furthermore, the earthquake ground motion considering the variation of the site amplification factors was calculated, and the relation between the variation of the site amplification factors and the variation of representative values of earthquake ground motion was discussed. As a result, the peak ground accelerations, peak ground velocities, and power spectrum intensity values of the earthquake ground motions the average site amplification factor are smaller than the of the earthquake ground motions.