2018-05-28松原M_(S)5.7地震地电场变化特征研究  

Study on Variation Characteristics of Natural Electric Field in Songyuan M_(S)5.7 Earthquake on May 28,2018

作　　者：李梦莹[1] 张志宏[1] 焦明若[1] 方禹心 LI Mengying;ZHANG Zhihong;JIAO Mingruo;FANG Yuxin(Liaoning Earthquake Agency,44 North-Huanghe Street,Shenyang,110034,China;Shenyang Earthquake Monitoring Center Station,32 Lane of 208 Dongling Road,Shenyang,110161,China)

机构地区：[1]辽宁省地震局,沈阳市110034 [2]沈阳地震监测中心站,沈阳市110161

出　　处：《大地测量与地球动力学》2022年第12期1276-1280,1299,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地球物理研究所基本科研业务费专项(DQJB21B34);中国地震局震情跟踪定向工作任务(2022010412,2022010301);辽宁省地震局科技项目(2022025,2022035)。

摘　　要：通过研究东北地区地电场观测资料,结合2018-05-28吉林松原M_(S)5.7地震,分别对震中周边自然电场E_(SP)和大地电场E_(T)地震前后背景、临震、震后响应时序变化进行对比分析,并应用岩体裂隙水电荷移动渗流模型计算研究区电荷移动的优势方位。结果表明,震前绥化、林甸、肇东、望奎自然电场E_(SP)出现明显的小幅度突跳或大幅度跃变,电荷移动的优势方位震前3个月内出现45°挤压或拉张异常特征。We study the observational data of the geoelectric field in northeast China and combined with the Songyuan M_(S)5.7 earthquake on May 28,2018,in Jilin.At the same time,we comparatively analyze the background,imminent and post-earthquake response time series changes of the natural electric field E_(SP) and the telluric field E_(T) around the epicenter.In the study area,we calculate the dominant direction of charge movement by applying the charge movement seepage model of rock fissure water.The results show that the natural electric field E_(SP) in Suihua,Lindian,Zhaodong,and Wangkui show obvious small-amplitude sudden jumps or large-scale jumps before the earthquake,and 45°extrusion or tension anomalies feature occurred in the dominant direction of charge movement within 3 months before the earthquake.

关 键 词：松原M_(S)5.7地震 自然电场 大地电场 裂隙结构 异常机理 

分 类 号：P315[天文地球—地震学]