Abstract
We proposed a simplified method for calculating seismic slope collapse ratio in order to grasp disruption ratios of a boardband traffic network during a scenario earthquake. The used data are geography, slope failure areas and peak ground acceleration (PGA) etc. of whole Mt. Rokko during the 1995 Hyogo-ken nambu earthquake. We elimilated data on reinforced slope from them by scrutinizing construction reports etc. Logistic regression analysis using two data, angle of slope and PGA as the explanatory variable was conducted as well as that using three data, angle and average curvature of slope and PGA. The calculated ratios are correlated highly with areas of collapsed slopes during the earthquake. The result indicates the propsed method has a possibility for calculating earthquake-induced slope failure ratio.
