永胜地震台钻孔应变震前异常分析  

Aonmaly analysis of borehole strain at Yongsheng Seismic Station before earthquke

作　　者：赵琴 相传芳 王迪 ZAHO Qin;XIANG Chuanfang;WANG Di(Yongsheng Seismic Station, Yunnan Province 674200, China;Yudong Earthquake Monitoring Station, Zhaotong Earthquake and Disaster Mitigation Bureau, Yunnan Province657000, China;Kaiyuan Earthquake Agency, Yunnan Province 661699, China)

机构地区：[1]永胜地震台,中国云南674200 [2]昭通市防震减灾局渔洞地震监测站,中国云南657000 [3]开远市地震局,中国云南661699

出　　处：《地震地磁观测与研究》2018年第1期129-138,共10页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局监测;预测;科研三结合课题(项目编号:CEA-JC/3JH-16250X)

摘　　要：使用永胜地震台分量钻孔应变2013—2016年观测资料,对出现的异常现象进行分析,结果发现,异常的成因既有干扰因素,也有前兆因素。在云南省几次M 4.4—5.5地震发生前,永胜地震台分量钻孔应变出现较为显著的短期异常,异常特征主要表现为:震前多分量应变速率突然增大或张性与压性应变交替变化,异常结束后1—20天发震。Using borehole strain observation data of Yongsheng Seismic Station from2013to2016,we analyzed the abnormalies that caused by disturbance and precursory.The resultsuggest that,before several earthquakes with magnitude between M4.4to5.5in Yunnan Province,there were shortterm anomalies.The abnormalies mainly showed that the rate of multi-component strain increase suddenly or the strain changed alternatively as tensile and compressive feature.The earthquake often occurred after1to20days when anomaly finished.

关 键 词：钻孔分量应变观测 应变异常 异常分析 

分 类 号：P315.7[天文地球—地震学]