A PROBABILISTIC SEISMIC HAZARD ANALYSIS USING PGA AND PGV AS GROUND MOTION INTENSITY MEASURES

In order to improve the accuracy of risk analysis, authors propose a seismic hazard analysis method using two ground motion intensity measures; peak ground acceleration (PGA) and peak ground velocity (PGV). Since the seismic hazard is expressed by the joint probability of exceedance for given PGA and PGV, it is necessary to evaluate a correlation between these intensity measures. Recently large amounts of earthquake observation data have been utilized by K-NET and KiK-net databases, so that the above correlation can be calculated. In this paper, the correlation in the Kanto district is evaluated, and is applied to seven reference sites, followed by the conclusion that North-Kanto area and South-Kanto area possess different seismic hazard in the aspects of the shape of hazard plane, and the inclusion of dependency of correlation on seismic magnitude or on the focal distance has a large effect on the hazard estimation.