玉树Ms7.1地震前地电场异常变化特征分析
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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.
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.
引文
1关华平,刘桂萍.震前电磁辐射异常与地震关系研究[J].地震学报,1995,17(2):237-246.
2毛桐恩,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
3 Varotsos P and Lazaridou M.Latest aspects of earthquakeprediction in Greece based on seismic electric signals[J].Toctonophysics,1991,188:321-347.
4赵玉林,等.电测量在中国地震预报中的应用[J].地震地质,200l,23(2):277-285.
5 http://www.csi.ac.cn/manage/html/4028861611c5c2ba0111c5c558b00001/_content/10_04/15/.html.
2毛桐恩,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):519-528.
3 Varotsos P and Lazaridou M.Latest aspects of earthquakeprediction in Greece based on seismic electric signals[J].Toctonophysics,1991,188:321-347.
4赵玉林,等.电测量在中国地震预报中的应用[J].地震地质,200l,23(2):277-285.
5 http://www.csi.ac.cn/manage/html/4028861611c5c2ba0111c5c558b00001/_content/10_04/15/.html.
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