Study on tsunami source model of scenario earthquakes in Japan sea considering fault asperity

Abstract

With the progress of recent seismological research, we have understood that slip distribution of earthquake fault rupture is generally heterogeneous and has fault asperity. However this heterogeneity of fault slip has not been considered enough in scenario earthquakes of tsunami prediction. In this study (1) we performed inversion analyses of past three large earthquakes in Japan sea (1964 Niigata, 1983 Nihonkai-Chubu and 1993 Hokkaido Nansei-Oki) using tsunami height data in order to investigate the characteristics of slip heterogeneity, (2) based on the inversion results, we proposed a modeling procedure of fault asperity on tsunami source model of scenario earthquakes.