FACTORIAL ANALYSIS USING GIS FOR THE DAMAGED HOUSES ON RESIDENTIAL FILL LAND DUE TO THE 1993 KUSHIRO-OKI EARTHQUAKE

Abstract

The analysis using GIS was applied to find out the causes of the damaged houses due to the 1993 Kushiro-oki earthquake on the residential fill land in the eastern part of Kushiro city. The factors such as distance from boundary of cut and fill, thickness of cutting or filling, original angle of slope under fills, i.e., before artificial change of topography and height of cliff were chosen and compared with the grade of damage such as total collapse, partial collapse and so on. The results through the analysis are summarized as follows. 1) Almost all heavily damaged houses are located on filled sites rather than on cutted sites. 2) The thickness of fills and the original angle of slope under fills are principal factors causing damage of houses. 3) Conclusions above 1 and 2 are pointed out more clearly through discriminant analysis which shows the significant correlation between the selected factors and damage of houses.