地震动参数与地震灾害相关性分析——以汶川震区地震滑坡灾害为例

Analysis of correlation between ground motion parameters and earthquake disasters:A case study on earthquake-induced landslide hazard in Wenchuan earthquake area

本文以汶川地震滑坡震害为例,设计一种方法,对几个反映不同地震动特性的地震动参数与地震滑坡灾害的相关性进行了分析比较.结果表明:Arias强度参数与地表破坏的相关性最好,该参数比较适合小区域范围的震害预测评估;峰值加速度与地表破坏的相关性较好,但更适合作为较大区域的震害评估参数;与持时和频率有关的参数对于具体场地的震害机理分析具有辅助作用;垂向地震动对滑坡震害的作用不容忽视.本文结论对于其它震害相关研究中评估因子的选取具有参考意义.

A method was designed by taking the case of landslide hazards induced by the Wenchuan earthquake to study the correlation between parame-ters reflecting different ground motion characteristics and earthquake-induced landslide hazards.The results indicate that Arias intensity is the best parameter for disaster evaluation,which is more suitable for small region estimation.And the peak ground acceleration also behaves well in correlation analysis,but it is more suitable for evaluation of large area.The parameters,related with dura-tion and frequency,can provide accessory information in analysis on mechanism of earthquake damage in concrete site.The vertical component plays an impor-tant role in evaluating earthquake-induced landslide hazards.The results have certain reference significance for selecting evaluation factors in studies related with earthquake-induced secondary hazards.