Seismic Hazard Analysis based on the Joint Probability Density Function of PGA and PGV

摘要

In seismic probability safety analysis, ground motion intensity is usually expressed by a single index such as peak ground acceleration (hereinafter called PGA), spectral acceleration at a specified period, or peak ground velocity (hereinafter called PGV). Limiting the number of indices, however, gives large uncertainty in the estimation of annual failure probability that is given by convolving seismic hazard curve and seismic fragility curve, since information except for ground motion intensity is lost. This study examines the seismic hazard using PGA and PGV, for which many attenuation relations are proposed. After analyzing correlation coefficient between PGA and PGA using K-NET and KiK-net databases, probabilistic seismic hazard for seven sites in Kanto district in Japan is evaluated.