A Statistical Consideration on Debris Flow Disaster by Quantification Theory

On July 23th, 1982, many debris flows occurred in Nagasaki prefecture due to the localized heavy rainfall. They brought out a considerable damege to Nagasaki prefecture, particularly to East Nagasaki district. In another paper, the authors estimate a risk due to debris flow by an evaluetion method based on a mechanism of occurrence of debris flow. In this paper, we try to predict a risk of occurrence of debris flow and evaluete the degrees of contribution of many factors to it statistically. we apply a quantification theory to the debris flows in East Nagasaki district, and repport the results of the analysis with some considerations