Abstract
Data on the landslide activities in the reservoir slopes and the causes of such conditions were collected for 84 reservoir landslideslopes composed of Paleozoic Mesozoic strata. Four active levels were defined, and the landslide activities were classified. To investigatethe predictability of active levels, ten items affecting the landslide activities were chosen, and a formula for evaluatingthe relationships between the active levels and the ten items were developed by using a statistical method called “quantificationtheory type II”. In predicting active levels resulting in collapse or ground surface fall, the formula has a prediction accuracy ofaround 80 percent. Then, the feasibility of decision making of reservoir landslide prevention works appropriate for the active levelwas investigated.
