玉树Ms7.1地震前地电场异常变化特征分析  

PRELIMINARY ANALYSIS OF CHARACTERISTICS OF ANOMALOUS VARIATION OF GEOELECTRIC FIELD BEFORE YUSHU Ms7.1 EARTHQUAKE

作　　者：张小涛[1] 陈化然[2] 马新欣[2] 刘晓灿[2] 姚丽[2] 袁亚红[2] 

机构地区：[1]河北省地震局邯郸中心台,邯郸056001 [2]中国地震局地球物理研究所,北京100086

出　　处：《大地测量与地球动力学》2011年第B06期38-42,共5页Journal of Geodesy and Geodynamics

基　　金：中央级公益性科研院所基本科研业务专项:华北地区电磁场动态演化特征研究

摘　　要：对玉树地震周围台站电场资料,在消除来自空间的各种辐射和各种高频突变干扰后,利用电场矢量方位角和振幅的时间序列与空间动态演化特征,讨论了玉树地震前电场异常变化特征,研究结果表明:玉树地震前4～35天成都、天水、拉萨、汉王、都兰、甘孜6个台站都出现了异常,而且异常出现的时间同步性较好,震前的7±3天之内有5个台站同步出现突变异常,异常幅度范围在15～400 mV/km。时间和空间特征异常在震前已出现,反映了异常来自震源区。Through analysis and research on the telluric electric field data around the Yushu earthquake, the anomalous characteristics of the telluric electric field vector are extracted by the use of time series and spatial dynamic evolution of the telluric electric field vector azimuth and amplitude, in which some variation caused by the solar activity, such as radiation, particle wind and so on and the high-frequency abrupt disturbances are eliminated. We preliminarily studied the characteristics of the anomalous variation of telluric electric field prior to this quake and obtained folowing knowledges：the anomalous vector amplitude appeared 4 -35 days before Yushu earthquake in Chengdu, Tianshui, Lhasa, Hanwang, Dulan, Ganzi seismic stations, and their occurrence time as well synchronistical. The abrupt anomaly synchronously occurred at five seismic stations 7 _＋ 3 days before the earthquake, the amplitude range is 15 -400 mv/km. The temporal and spatial anomaly appeared before the earthquake, and show that the anomalies come from the hypocenter.

关 键 词：地电场 玉树7.1级地震 断裂带 动态演化 机理 

分 类 号：P315.728[天文地球—地震学]