PROBABILISTIC SEISMIC HAZARD ANAYSIS OF LONG PERIOD EARTHQUAKE GROUND MOTION FOR THE KANTO DISTRICT

Abstract

Empirical equations for estimating 1% damped psude velocity response spectra and duration index, the ratio of energy spectra to velocity response spectra for 10 % damping ratio, in the range of period from 2 to 20 sec were determined based on the observed records for 18 large earthquakes and the simulated motions for two scenario earthquakes by 3-dimensional numerical calculation. Using the empirical equations, a probabilistic seismic hazard analysis of long period earthquake ground motion for the Kanto district was performed and a method for obtaining spectrum compatible motions from a uniform hazard response spectrum was proposed.