| Based on previous study of landslide occurrence ratio and causative factors for landslides induced by the Mid-Niigata Prefecture earthquake, a simple risk evaluation method for earthquake-induced landslide is proposed. In this study, 727 pre-existing landslide sites and 55 earthquake induced landslides occurred within pre-existing landslide sites were analyzed. According to the analysis of the relationship between causative factors and landslide occurrence ratio, a score ranging 0-2 is determined for the factors, marked 10 in max, and 0 in minimum. And to evaluate the landslide occurring risk, the total scores are marked 3 ranking, Rank1 includes those landslides scored 0-4, Rank2 is 5-7 and Rank3 is 8-10. The landslide occurrence ratio is 4% in Rank1, 8% in Rank2 and 17% on Rank3, respectively. The results have implication to the landslide mitigation measures with the consideration of possible earthquake. |
