大地电磁场的两种大震短临异常  

TWO KINDS OF SHORT-IMPENDING TERM ANOMALY BEFORE LARGE EARTHQUAKE IN MAGNETO-TELLURIC FIELD

作　　者：安海静[1] 赵家骝[2] 赵和云[1] 刘宝勤[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局分析预报中心,北京100036

出　　处：《西北地震学报》2004年第2期168-173,共6页Northwestern Seismological Journal

基　　金：中国地震局中法合作项目资助(24617);中国地震局兰州地震研究所论著编号:LC20040045

摘　　要：根据中法电磁合作台运行6年的资料,在年变形态对比的基础上合理地选取有效测道值构建了相应的时间序列图。从中发现昆仑山口西8.1级大震前一个多月时间中,正常大地电磁场中叠加间歇性畸变干扰,按形态分为'阶跃突跳'、'单尖突变'两种类型。简略地讨论了产生两种异常现象的可能机制。Based on all geoelectric and geomagnetic data observed in 6 years at Sino-France cooperate station,in contrasting of annual variation for years, the observation data in measuring lines are selected reasonably and the time series curves are plotted by these data. It is discovered that normal background fluctuation is added the variation of distortion for a month and more before western Kun Lun Mountain earthquake M_S=8.1. According to the distortional shape, there are 2 kinds of forms: the step abrupt change and the sudden change with single needle shape. A possible mechanism of 2 kinds anomaly is discussed in this paper.

关 键 词：大地电磁场 短临异常 日变时间序列 年变 

分 类 号：P315.72[天文地球—地震学]