DIFFERENCE IN GROUND MOTION CHARACTERISTICS BETWEEN SURFACE AND BURIED RUPTURE INLAND CRUSTAL EARTHQUAKES IN JAPAN

Abstract

 Recently, large scale inland crustal earthquake have occurred frequently in Japan, and some of them have surface rupture. Existence of surface rupture significantly affects on ground motion characteristics, however, inland crustal earthquakes in Japan have been not previously analyzed except for the 1995 Kobe earthquake. In this study, we analyzed difference of ground motion characteristics between surface and buried rupture earthquakes in Japan. Ground motion characteristics were evaluated from deviations of observed response spectra with average response spectra calculated from a spectrum attenuation relationship. As a result, ground motion from buried rupture earthquake is two-times larger than those by surface rupture earthquake in frequency range between 0.1 and 0.4 seconds.