THERELATION BETWEEN FOURIER PHASE CHARACTERISTICS OF GROUND MOTIONS AND LOCATION OF EPICENTERS

Abstract

 According to some of conventional studies focused on Fourier phase, it is pointed out that there are some examples in which Fourier phase characteristics of a ground motion from an aftershock of a past damaging earthquake is similar to that of a ground motion from the mainshock. This means that Fourier phase characteristics of ground motions from small earthquakes can be useful in order to predict ground motions from scenario earthquakes in the future. This paper presents, by using the 2003 Tokachi-oki earthquake (M_J8.0) as an example of a past damaging earthquake, the quantitative relation between the similarity with respect to Fourier phase characteristics of ground motions and the location of epicenters of small earthquakes which happened ofi Tokachi Region, Hokkaido, northern Japan.