Journal of Natural Disaster Science

ESTIMATION OF PEAK GROUND MOTION ON THE BASE ROCK AND ITS AMPLIFICATION DURING THE 1995 HYOGOKEN-NAMBU EARTHQUAKE

Tadanobu SATO
Professor, Disaster Prevention Research Institute, Kyoto University
and
Junji KIYONO
Associate Professor, Depart. of Computer Science and Systems Eng., Yamaguchi University

(Received 27 February, 1995 and in revised form 2 May, 1995)

Abstract

The attenuation of peak ground motion on rock sites is not available for the January 17, 1995 Hyogoken-nambu earthquake. We therefore calculated the theoretical distribution of the maximum velocity and acceleration at the base rock level in the region near the earthquake source, then introduce the amplification factor of the surface ground in order to calculate the peak velocity on the ground surface. Estimated peak velocities were compared with the recorded values, and the amplification factors of the area concerned were investigated.

Key words

1995 Hyogoken-nambu earthquake, peak ground motion, base rock level, amplification factor