Abstract
Fragility curves for the slope failure probabilities conditional to the ground motion level were evaluated based on statistical method. For the evaluation of fragility curves, resisting capacity of slope in earthquake was assumed to a log-nomal distribution with random variable as ground acceleration, and the parameters of the distribution were estimated using the maximum likelifood method. A risk of slope failure was categorized into three levels considering to topographical factors as the inclination and condition of water erosion which were extracted from the topographical map. The obseved data from Izu peninsula earthquake (1974) and Izu-Oshima-kinnkai earthquake (1978) were used as statistical sample data, and contribution of factors to risk of slope failure were studied.
