四川汶川地震诱发滑坡与峰值速度的关系

Relationships between the Wenchuan earthquake-induced landslide and peak ground velocity,Sichuan,China

利用汶川地震诱发的滑坡资料和得到的地震动数据,对地震诱发滑坡与峰值速度的关系进行了分析,得到一些基本认识:①地震诱发滑坡与地震动峰值速度(PGV)存在明显的正相关性,可以利用PGV作为判别地震滑坡的判据;②汶川地震龙门山震区可以触发地震滑坡的PGV下限约为0.5m/s;③龙门山震区可以触发地震滑坡的PGV上限约为1.5m/s;④建立了汶川地震龙门山震区PGV衰减关系,可用以估计地震滑坡致灾的范围。利用地震动参数研究地震诱发滑坡具有很好的一致性,可以克服应用烈度时存在的不足。上述研究结果可以应用于震后灾害快速评估工作中,为应急救援方案的制定提供参考信息。

Based on the data of landslides induced by the Wenchuan earthquake and of strong ground motion,the relationship between earthquake-induced landslides and PGV is analyzed and some conclusions are obtained as following：（1） There exists an obvious positive relation between earthquake-induced landslides and PGV,therefore,PGV can be used to judge the failure result of slopes after an earthquake.（2） The PGV threshold,which can trigger landslides in the Longmenshan earthquake-hit areas,is about 0.5m/s.（3） The upper limit of PGV is about 1.5m/s in the Longmenshan areas.（4） An attenuation law of PGV is built for the Longmenshan areas,which can be used to estimate the area affected by earthquake-induced landslides.Consistency is found if ground motion parameters are used to measure earthquake-induced landslides,which can compensate the deficiencies of earthquake intensity.Research result obtained from this paper can be applied to the rapid hazard evaluation work after an earthquake and provides reference information for emergency rescue decision making.