Analysis of correlation between ground motion parameters and earthquake disasters: A case study on earthquake- induced landslide hazard in Wenchuan earthquake area
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摘要: 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.Abstract: A method was designed by taking the case of landslide hazards induced by the Wenchuan earthquake to study the correlation between parameters 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 duration and frequency, can provide accessory information in analysis on mechanism of earthquake damage in concrete site. The vertical component plays an important 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.
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表 1 不同地震动参数与地震滑坡灾害相关性结果
Table 1. Correlation coefficients between different ground motion parameters and earthquake-induced landslide hazards
地震动参数 三分向 r10 r20 r30 r40 r50 峰值加速度 EW 0.4125 0.4959 0.5309 0.5774 0.5998 NS 0.5056 0.5979 0.6135 0.6555 0.6644 UD 0.5241 0.5138 0.4825 0.5109 0.5373 峰值速度 EW 0.3966 0.3927 0.4572 0.5148 0.5198 NS 0.3909 0.5251 0.5731 0.5876 0.6156 UD 0.3272 0.4705 0.5371 0.5557 0.5736 峰值位移 EW 0.1708 0.2480 0.3723 0.4520 0.4592 NS 0.3602 0.4959 0.5692 0.5765 0.5131 UD 0.2126 0.3493 0.3649 0.3515 0.3811 Arias强度 EW 0.5090 0.5315 0.5348 0.5551 0.5613 NS 0.5805 0.5812 0.5631 0.5856 0.6041 UD 0.5671 0.4932 0.4268 0.4616 0.4924 5%-95% EW -0.1924 -0.3420 -0.3273 -0.3298 -0.3226 能量持时 NS -0.1902 -0.3519 -0.3362 -0.3205 -0.3088 UD -0.3798 -0.5019 -0.4659 -0.4536 -0.4524 0.1g括号持时 EW -0.0015 -0.0414 0.0094 0.1095 0.1462 NS -0.0053 -0.0417 0.0072 0.1074 0.1479 UD -0.0165 -0.0540 -0.0014 0.1012 0.1379 0.1g括号持时 EW 0.3963 0.2415 0.2009 0.2889 0.2559 内过零点频次 NS 0.4136 0.2908 0.2445 0.3135 0.2686 UD 0.4071 0.3768 0.3283 0.4167 0.4394 注: 相关性计算采用Matlab软件.r10,r20,r30,r40,r50分别表示10,20,30,40,50 km范围内地震动参数与地震滑坡灾害的相关系数. -
王秀英. 2009. 地震滑坡灾害快速评估技术及对应急影响研究[D]. 北京: 中国地震局地质研究所: 1-3.Wang X Y. 2009. A Study on Fast Evaluation of Earthquake-Induced Landslides and Their Effect on Earthquake Emergency Rescue[D]. Beijing: Institute of Geology,China Earthquake Administration: 1-3 (in Chinese). -