吉林前郭M_S5.8震群前地电异常分析  

Anomalies of Geo-electrical Resistivity and Self-potential before the M_S5.8 Earthquakes Swarm in Jilin Province

作　　者：史红军[1] 赵卫星[1] 孙旭丽[2] 康建红[2] 刘立波 李宁[1] SHI Hong-jun;ZHAO Wei-xing;SUN Xu-li;KANG Jian-hong;LIU Li-bo;L I Ning(l.Yushu Seismic Station,Jilin Changchun 130400,China;Earthquake Administration of Jilin Province,Jilin Changchun 130117,China;Siping Seismic Station,Jilin Siping 136000,China)

机构地区：[1]榆树地震台 [2]吉林省地震局 [3]四平地震台

出　　处：《防灾减灾学报》2017年第4期39-44,共6页Journal of Disaster Prevention And Reduction

基　　金：中国地震局"地震监测;预测;科研三结合"课题(140701;150703);地震行业科研专项结余资金使用计划项目(2013年吉林前郭5.8级震群研究)(2060302)共同资助

摘　　要：2013年10—11月,吉林前郭发生M_S 5.8震群,距震中200 km的榆树地震台以及距离震中150 km的四平地震台记录到了震前不同程度的地电阻率、地电场异常变化:地电阻率表现为形态上破年变异常和归一化变化速率高值异常,异常持续时间最长达3年之久,最短只有7个月,属于中短期异常;地电场原始分钟值曲线出现趋势上升和阶变,异常持续时间为10天左右,表现为短临异常。The Ms 5.8 earthquake swarm occurs in Qian＇guo County of Jilin Province from October to November 2013,and different degree abnormal changes of earth resistivity and geoelectric field of Yushu and Siping Seismic Station which distance 200km and 150km from the epicenter are recorded before the earthquake swarm. The ground resistivity shows abnormal in form and annual variation,and normalized change rate is high value anomaly,the longest duration of the anomaly is 3 years,the shortest is only 7 months,belongs to middle and short term anomaly; the curves of original minute value of geoelectric field appears trend of rising and step changes,the abnormal duration is 10 days or so,which showes a short impending anomaly.

关 键 词：震群型地震 地电阻率 地电场 中短临异常 

分 类 号：P315.722[天文地球—地震学]