云南跨断层场地特征强度指标分析  

Characteristic Strength Index Analysis of Cross-fault Site in Yunnan

作　　者：徐声鑫 王岩[1] 汪志民[1] 黎志军 XU Shengxin;WANG Yan;WANG Zhimin;LI Zhijun(Yunnan Earthquake Agency,Kunming 650224,China;Guilin University of Technology,Guilin 541004,China)

机构地区：[1]云南省地震局,昆明650224 [2]桂林理工大学,广西桂林541004

出　　处：《华南地震》2022年第2期17-24,共8页South China Journal of Seismology

基　　金：2018年国家重点研发计划综合利用空间观测技术的大地震孕育发生变形时空特征研究课题“中国大陆主要活动构造断裂带的分段运动特征研究”(2018YFC1503604)。

摘　　要：为探索使用跨断层特征强度指标的方法对地震前兆异常进行识别和判定,利用1982—2019年云南地区5个跨断层场地(楚雄、丽江、永胜、寻甸、建水)的所有观测数据,通过计算跨断层特征强度指标,根据不同窗长提取可能的地震前兆异常信息,并结合历史震例,探讨云南及周边地区6.5级以上地震与跨断层特征强度指标之间的关系。结果显示:跨断层特征强度指标在5个跨断层场地的应用中总体是有效的,能够捕获到云南地区震前异常信息,可在实际跟踪分析中进行使用。In order to explore the identification and determination of earthquake precursor anomalies by using the method of cross-fault characteristic intensity index,all the observation data of five cross-fault sites(Chuxiong,Lijiang,Yongsheng,Xundian,Jianshui)in Yunnan from 1982 to 2019 are used to calculate the cross-fault characteristic intensity index,and extract possible earthquake precursor anomaly information according to different window lengths.Combined with historical earthquake cases,this paper discusses the relationship between earthquakes with M≥6.5 and cross-fault characteristic strength indexes in Yunnan and its surrounding areas.The results show that the cross-fault characteristic strength index is generally effective in the application of 5 cross fault sites,which can capture the abnormal information before earthquakes in Yunnan area and can be used in the actual earthquake tracking analysis.

关 键 词：特征强度指标 跨断层 前兆异常 云南地区 M≥6.5地震 

分 类 号：P315.5[天文地球—地震学]