EFFECTS OF THE SPATIAL CORRELATION BETWEEN GROUND MOTION INTENSITIES ON THE SEISMIC RISK OF PORTFOLIO OF BUILDINGS

Abstract

Authors have proposed the risk quantification method for a portfolio of buildings, in which the risk reduction effect by diversifying the buildings is given assuming that the variability in the ground motion intensity in each site is fully correlated. Since this assumption gives the conservative results, it is required to obtain the realistic value from the viewpoint of risk management. Recently, large amounts of earthquake observation data have been utilized, so that the spatial correlations of ground motion intensities in the different sites can be calculated. In this paper, abovementioned correlation in the Kanto district is obtained using K-NET and KiK-net data, and is applied to the model portfolio of the buildings, followed by the conclusion that introducing the correlation has a large effect on the estimated losses.