汶川8.0级地震前邻区远程动态触发小震活动异常特征研究  

Anomalous characteristics of remotely and dynamically triggered small earthquake activity in adjacent areas before the Wenchuan MS8.0 earthquake

作　　者：邹文轩 冯建刚[1,2] ZOU Wenxuan;FENG Jian'gang(Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China;Gansu Earthquake Agency,Lanzhou 730000,Gansu,China)

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]甘肃省地震局,甘肃兰州730000

出　　处：《地震工程学报》2023年第1期228-234,共7页China Earthquake Engineering Journal

基　　金：中国地震局地震科技星火计划项目(XH23042A);甘肃省自然科学基本项目(22JR5RA823);甘肃省地震局科研创新团队(2019TD-02-01)。

摘　　要：基于龙门山断裂带及邻区2000—2008年的小震目录资料,采用全球7级以上地震活动影响“叠加”的思路,系统分析震前邻区小震受远程动态触发的异常活动特征。结果表明:汶川8.0级地震前,龙门山断裂带及邻区的小震活动明显受全球7级地震活动的影响,震前1年左右龙门山断裂带及邻区小震活动受远震动态触发活动的异常特征显著。并采用随机检验方法和改变统计参数对计算结果的可靠性进行验证。该方法能够有效地突出震前发震断层上远程动态触发小震的异常活动特征,对区域强震危险性评估具有一定的参考意义。Based on small earthquake catalog data from 2000 to 2008 in the Longmenshan fault zone and its neighboring areas, we apply the idea of impact “superposition” of global earthquake activity(M>7) in systematically analyzing the anomalous activity characteristics of remotely and dynamically triggered small earthquakes in the neighboring areas before a major earthquake. Results show that before the Wenchuan MS8.0 earthquake, the small earthquake activity in the Longmenshan fault zone and adjacent areas was influenced by global earthquake activity(M>7). About one year before the MS8.0 earthquake, there were significant abnormal characteristics of small earthquake activity triggered by remote earthquakes. The reliability of calculation results was verified by using the random test method and changing the statistical parameters. The method can effectively highlight the anomalous activity characteristics of small earthquakes that are remotely and dynamically triggered on the seismogenic fault before a major earthquake, thus having some reference significance for regional strong earthquake risk assessment.

关 键 词：远程动态触发 龙门山断裂带 汶川地震 

分 类 号：P315[天文地球—地震学]