文安M_L5.5地震前的大地电场异常初探
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摘要
对2002年以来的静海地震台、宝坻地震台的大地电场连续观测资料,使用地电场观测的同一测向长、短极距测值的比值法进行分析处理,计算结果显示,2006年7月4日文安ML5.5地震前大地电场观测存在明显的地震前兆,但从同期的地电场原始观测资料中无法识别出该项异常信息。研究结果表明,同一测向长、短极距测值的比值法是一种从电场观测资料中有效识别和提取地震前兆信息的方法。
Through analyzing and processing the continuous observation data of the telluric electric field at Jinghai and Baodi stations which close to the epicenter of Wen′an earthquake of ML5.5 on July 4,2006 since 2002,preliminary results show there are anomaly in telluric electric field before the Wen′an earthquake.It is indicated that multi-polar with short distance observation may be an effective approach to identify Geo-electric anomaly before earthquakes.
Through analyzing and processing the continuous observation data of the telluric electric field at Jinghai and Baodi stations which close to the epicenter of Wen′an earthquake of ML5.5 on July 4,2006 since 2002,preliminary results show there are anomaly in telluric electric field before the Wen′an earthquake.It is indicated that multi-polar with short distance observation may be an effective approach to identify Geo-electric anomaly before earthquakes.
引文
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[2]马钦忠,冯志生,宋治平,等.崇明与南京台震前地电场变化异常分析.地震学报,2004,26(3):304-312
[3]田山,王建国,徐学恭,等.大地电场观测地震前兆异常提取技术研究.地震学报,2009,31(4):424-431
[4]郭凤岐.天津通志—地震志.天津:天津社会科学院出版社,1995
[5]田山,郑文俊,张建新,等.大地电场观测深埋铅电极测量系统试验,华北地震科学,2006,24(1):5-9
[6]马钦忠,钱家栋.地下电性非均匀结构对地电场信号的影响.地震,2003,23(1):1-6
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