华北、东北地区地电场优势方位角分析  

Earthquake case analysis of the telluric field rock cracks in North and Northeast China

作　　者：张国苓[1] 任印国 乔子云[1] 贾立峰[1] 罗娜[1] ZHANG Guoling;REN Yinguo;QIAO Ziyun;JIA Lifeng;LUO Na(Hebei Earthquake Agency,Shijiazhuang 050021,China;Hebei Hydrological Survey and Research Center,Shijiazhuang 050021,China)

机构地区：[1]河北省地震局,中国石家庄050021 [2]河北省水文勘测研究中心,中国石家庄050000

出　　处：《地震地磁观测与研究》2021年第6期89-97,共9页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局震情跟踪定向工作任务青年课题(项目编号:2020010411)。

摘　　要：收集整理2000年以来华北、东北地区20余个台站记录的地电场分钟值观测资料,利用潮汐波岩体裂隙水(电荷)流动模型,计算台站的地电场优势方位角,结果表明:华北、东北地区5级以上浅源地震地电场方位角异常明显,多以45°偏转和收窄变化为主;深源地震的地电场方位角异常不明显。以上现象进一步说明大地电场优势方位角与岩石裂隙结构密切相关。With the model of telluric field rock cracks,this work analyzes more than 20 stations in North and Northeast China using minute-sampled electric field observations since 2000.The results show that the telluric field rock cracks derived from electric field observations are affected by the leakage of HVDC transmission at the trial operation stage.We find obvious anomaly changes of telluric field rock cracks before M;≥5 shallow earthquakes within 300 km to the epicenters.At these sites occurred more easily structural variations such as rock shear cracks,deflection of preferred orientation and narrowing.But the anomaly change is not obvious before M;≥5 deep earthquakes.

关 键 词：地电场 优势方位角 震例 干扰 

分 类 号：P315.722[天文地球—地震学]