STUDY ON A NEW METHOD TO CONSTRUCT A HAZARD MAP USING NUMERICAL SIMULATION BY COMPARING WITH A CONVENTIONAL METHOD

A convetional method to estimate seismic hazard of urban buildings uses seismic amplification characteristics of subsurface soil layers and damage ratios of buildings which are achieved empirically. Though this method is easy to use, estimation results should have relatively large error because of the large uncertainty of the target phenomena. A purpose of this study is to construct a more accurate estimation method 8 of seismic hazard of urban buildings using numerical simulation in which seismic responses of all buildings are computed. For this purpose, authors had developed the method to construct the models of subsurface soil layers using borehole data. This study try to estimate the seismic hazard of urban area, which has approximately 100,000 buildings, by the numerical method. Finally, comparing the result with the one by a conventional method, the possibility of constructing hazard map by proposed method is discussed.