ANALYSIS OF SURFACE AND SUBSURFACE MICROTREMORS BY MODELING WAVE PROPAGATION AND PARTICLE MOTIONS

Abstract

The modeling of waves is often used to investigate ground wave propagation properties because of the complexity of actual ground motions. In this paper, the method of normalized input-output minimization (NIOM) is modified, and this modified NIOM method is used to analyze microtremors recorded at three different vertical-array sites in Japan. The main features of this study include using simultaneously recorded vertical-array microtremors, finding the direction of wave propagation by modeling the observed correlated waves, and obtaining the average particle motion to determine the type of wave present.