2011年安庆M4.8地震前合肥台地电阻率异常变化分析  

Analysis of Earth Resistivity Anomaly at Hefei Seismic Station before the 2011 Anqing M4.8 Earthquake

作　　者：何康[1,2] 解滔 王燚坤[1,2] 李军辉[1,2] 郑海刚 HE Kang;XIE Tao;WANG Yi-kun;LI Jun-hui;ZHENG Hai-gang(Anhui Earthquake Agency,Hefei 230031,China;Mengcheng National Geophysical Observatory,Mengcheng 233500,China;China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]安徽省地震局,安徽合肥230031 [2]安徽蒙城地球物理国家野外科学观测研究站,安徽蒙城233500 [3]中国地震台网中心,北京100045

出　　处：《地震》2023年第2期72-84,共13页Earthquake

基　　金：安徽省地震局“智能地震会商技术系统研制创新团队”资助。

摘　　要：合肥台地电阻率在2011年安庆M4.8地震前出现明显异常变化。通过对气象因素的相关分析、降水量的定量校正和有限元模拟,排除了气象因素和施工干扰导致地电异常的可能,确认该异常是安庆M4.8地震的震兆异常。文中也结合合肥台的地电异常,探讨了地电阻率异常的产生机理,认为地电阻率异常的各向异性特征,可能与主震震源机制解、发震构造走向等有关。上述工作对未来确定地电阻率异常和预测主震发生地点提供了重要参考。The earth resistivity at Hefei seismic station showed remarkable anomaly before the 2011 Anqing M4.8 earthquake.By means of correlation analysis of meteorological factors,quantitative rectifying of precipitation and the finite element simulation,the possibility of meteorological factors and construction interference causing the earth resistivity anomaly was excluded,this anomaly was finally verified to be a precursor anomaly of the 2011 Anqing M4.8 earthquake.In this paper,the generating mechanism of the earth resistivity anomalies is discussed,combined with the earth resistivity at Hefei seismic station.It is deemed that anisotropic characteristics of earth resistivity anomalies may be related to focal mechanism solution,seismogenic fault strike of the main shock.This work provides important reference for confirming earth resistivity anomalies and predicting the earthquake location.

关 键 词：2011年安庆M4.8地震 地电阻率异常 气象因素 震源机制解 各向异性 

分 类 号：P315.7[天文地球—地震学]