甘肃岷县6.6级地震前地磁垂直分量日变“双低点”异常  

Geomagnetism Vertical Component Diurnal “Double Low” Anomaly of Minxian M 6.6 Earthquake in Gansu Province

作　　者：郭明瑞[1] 胡久常[1] 马龙 吴佳林[1] 孙宗强 王锡娇[1] 王桂丹[1] GUO Mingrui;HU Jiuchang;MA Long;WU Jialin;SUN Zongqiang;WANG Xijiao;WANG Guidan(Hainan Earthquake Agency,Haikou 570203,China;Earthquake Prevention and Disaster Reduction Bureau of Shuifu County,Shuifu 657800,China)

机构地区：[1]海南省地震局,海口570203 [2]云南省水富县防震减灾局,云南水富657800

出　　处：《华南地震》2018年第3期39-44,共6页South China Journal of Seismology

摘　　要：2013年7月22日,地处南北地震带的甘肃岷县发生M 6.6地震。研究发现在6月19日,西北地区与华北地区部分地磁台垂直分量日变形态出现过"双低点"异常。震中位于低点位移分界线附近,孕震体环境在强震前由于应力变化引起介质电导率等电磁性质的改变,区域地磁场垂直分量日变曲线出现相位和幅度变化。说明地磁垂直分量日变"双低点"异常与地震的孕育和发生相关。On July 22nd,2013,M 6.6 earthquake occurred in Minxian county,Gansu province,located in the north-south seismic belt. The study found that on June 19th,the“double low”anomaly occurred in the daily variation of the vertical component of some geomagnetic stations in the northwestern region and northern China.The epicenter was near the low displacement boundary. Earthquake preparation body environment cause the change of medium conductivity and electromagnetic properties,there will be a regional geomagnetic field vertical component daily change curve of phase and amplitude changes. It is indicated that the“double low” anomaly of geomagnetic vertical component is related to the gestation and occurrence of earthquake.

关 键 词：地磁垂直分量 分界线 “双低点”异常 地磁日变 地震预测 

分 类 号：P315.721[天文地球—地震学]