微地形区分データを用いた広域の液状化危険度と液状化による建物被害率の予測に関する研究

概要

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A liquefaction potential map of a wide area is very useful for evaluating risk of liquefaction for the dwelling houses. In this study, the liquefaction potential map is developed by overlaying three maps including a PGV (Peak Ground Velocity) map, a liquefaction map from the past earthquakes and a land classification map. The damage ratio of the dwelling houses are evaluated as a production of three results which are the liquefaction susceptibility by the PGV at the ground surface and the ratio of liquefaction area in grid cells of 30 arc-seconds latitude × 45 arc-seconds longitude and the damage ratio of the dwelling houses in a liquefaction area from the past earthquakes. The prediction of this evaluation procedure shows a good agreement with the damage ratio of the dwelling houses for the 1987 Chiba-ken toho-oki Earthquake.