地震前电磁辐射日变异常观测数据的分析
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摘要
利用苏家屯地震台的电磁辐射数字化分钟值资料研究了地震前电磁辐射前兆异常现象。发现地震前观测到的电磁辐射超低频电场与磁场出现明显的短期日变异常;超低频电场幅度从120mV 逐渐上升为700mV,超低频磁场则由100nT 逐渐上升为1100nT。在此异常期间,电磁辐射显示出每天一个准周期的近似方波形态,方波上升和下降时间的规律变化符合"晨昏电势"的概念;信息发展过程明显地周期变化,周期为13.5天,表明晨昏电场是地震孕育过程中的重要现象。发现了以往没有注意到的电离层"异常"现象,拓展了数字地磁观测资料异常提取的应用范围。
By using the data of digital minutely value of electromagnetic radiation observed by Sujiatun geomagnetic station,the geomagnetic anomalies before earthquake were studied.It was found that there were obvious short period diurnal-variation anomalies in the electric field and magnetic field of electromagnetic radiation ultra-low frequency before earthquake.The amplitude of the ultra-low frequency electric field increased from 120mV to 700mV,and that of the ultra-low frequency magnetic field increased from 100nT to 1100nT.During the period,the electromagnetic wave showed the quasi-periodic square form every day.The anomalies of ascending and descending time accorded with the notion of daub-dusk electric potential obviously.The process of the anomaly information varied periodically with a circle of 13.5 days.The importance of the dawn-dusk electric potential caught by solar wind in process of earthquake was attested.The abnormal characteris- tics of ionosphere people seldOm pay attention to were shown,and the field of abstraction anomalies of digital geomagnetic data was enlarged.
By using the data of digital minutely value of electromagnetic radiation observed by Sujiatun geomagnetic station,the geomagnetic anomalies before earthquake were studied.It was found that there were obvious short period diurnal-variation anomalies in the electric field and magnetic field of electromagnetic radiation ultra-low frequency before earthquake.The amplitude of the ultra-low frequency electric field increased from 120mV to 700mV,and that of the ultra-low frequency magnetic field increased from 100nT to 1100nT.During the period,the electromagnetic wave showed the quasi-periodic square form every day.The anomalies of ascending and descending time accorded with the notion of daub-dusk electric potential obviously.The process of the anomaly information varied periodically with a circle of 13.5 days.The importance of the dawn-dusk electric potential caught by solar wind in process of earthquake was attested.The abnormal characteris- tics of ionosphere people seldOm pay attention to were shown,and the field of abstraction anomalies of digital geomagnetic data was enlarged.
引文
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[2] 刘绍亮,李立文.南向行星际磁场事件与磁暴关系的研究.地球物理学报,2002,5:297-305
[3] Zong Q G,Wilken B,Fu S Y,et al.Energetic oxygen ions in the magnetosheath in the negative Bz phase of the CME on January 10,1997． Adv Space Res,1999,25:2421-2424
[4] Chen M W,Lyons L R,Schulz M.Simulations of phase space distributions of storm time proton ring current.J Geophys Res,1994,99(A4) :5745-5759
[5] 曾小苹,林云芳,续春荣等.1991年3月26日5． 8级地震的磁效应初探.地震地磁观测与研究,1992,2(1) :44-52
[6] Summers D,Ma C,Mukai T.Competition between acceleration and loss mechanisms of relativistic electrons during magnetic storm.J Geophys Res,2004,109(A04221) :1-6
[7] 丁鉴海,所玉成,余素荣等.昆仑山口西8． 1级地震前电离层与磁场短期异常对比研究.地震,2004,2,4(1) :105-111
[8] Chen Y.Velocity shear induced transition of magnetohydrodynamic to kinetic Alfven waves.Phys Plasmas,2005,12(5) :052110
[9] 关华平,肖武军等.电磁辐射“EMOLS”仪观测结果原理及震例.地震,2004,24(1) :96-103
[10] 熊年禄,唐存琛,李行健著.电离层物理概论.武汉:武汉大学出版社,1999
[11] 王玉莹,佟晓辉,孙威.1999年岫岩 Ms5． 4级地震前震、主震、余震应变异常特征的研究.地学前缘,2003,10(2) :3-5
[12] 陈协珍.行星摄动力对太阳活动的调制.天体物理学报,1996,16(2) :207-212
[13] 冯志生,张苏平,梅卫萍等.基于数字地磁资料的滤波幅相法初步应用研究.地震,2006,1(1) :93-98
[14] 丁鉴海,卢振业,黄雪香.地震地磁学.北京:地震出版社,1994． 253-267
[15] 郭孝城,胡友秋.地球极区电离层对行星际激波的响应.地球物理学报,2007,7:951-956
[16] 张天辉,徐荣栏,李磊等.地球磁尾的电场模式.空间科学学报,2002,22(3) :220-226
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