采用滑坡风险评估三要素的方法,即: 风险区划(R_3) 、风险概率(R_P) 、风险损失(R_h),对汶川大地震极震区10个县市26 000 km~2面积区的震后滑坡风险进行了评估。结果显示,区内高风险区仅占9.03% 面积,但承担42%的滑坡发生概率和滑坡损失风险贡献; 较高风险区占14.61% 面积,承担25% 的风险贡献; 中风险区占22.28. %面积,承担19%的风险贡献; 低风险区占37.93%面积,承担11%的风险贡献; 无风险区占16.15%面积,承担3%的风险贡献。震后由于采取了有效的避险措施,滑坡风险明显降低的结果。

We adopt the assessment method based on the three factors of landslide risk as risk zonation,risk probability and risk loss to evaluate the landslides risk of Wenchuan earthquake meizoseismal area,which including 10 counties with the whole area of 26 000 km~2. Results show that although the higher risk region covers 9.03% area of the total,it makes 42% contribution to landslide occurrence probability and risk loss. The high risk region covers 14.61% area of the total and makes 42% contribution to landslide. The moderate risk region covers 22.28% area of the total and makes 19% contribution to landslide. The low risk region covers 37.93% area of the total and makes 11% contribution to landslide. The safe region covers 16.15% area of the total and makes 3% contribution to landslide. As results of effective prevention measures,the risk of landslide is reduced significantly after earthquake.