PRESENT AND FUTURE HAZARD MAPS FOR SOIL LIQUEFACTION

Abstract

Recently, hazard maps for soil liquefaction have been prepared in many cities in Japan. These maps must be useful for city planning against earthquakes. However, many uncertainties are involved in the zoning maps. In this paper, present evaluation methods for liquefaction potential are reviewed. Then, several problems to evaluate liquefaction potential and to draw hazard maps are studied. In the evaluation of liquefaction potential, it seemed that special attentions are necessary for the selection of appropriate estimation methods, the assumption of fines contents from soil types and the decision of the depth of water table. In the drawing of hazard maps, it seemed that special attention is necessary for narrow liquefiable areas if the hazard maps are expressed by grids.