汶川大地震前后电离层电子含量的扰动分析
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摘要
为了分析地震前后电离层电子含量的变化,本文选取四川汶川发生8.0级地震前后10天电离层中的电子含量作为研究对象,使用IGS网站提供的VTEC数据,采取统计学分析方法,结合太阳和地磁活动信息,对此次地震前后电离层VTEC资料进行了详细的统计分析和讨论,数据分析结果表明大地震前电离层电子含量会出现明显扰动,电离层中电子含量的异常变化有可能是地震发生的前兆信息.
To analyze the variation of the ionospheric total electron content (TEC) around the earthquakes,we select the ionospheric TEC of 10 days before and after the Ms8.0 earthquake that occurred on May 12,2008 in Wenchuan as our research object.Adopting the statistical analysis method,the lonopsheric VTEC data during the earthquake has been analyzed and discussed in detail,using the VTEC data offered by IGS,together with the solar and geomagnetic information.Numerical results show that obvious TEC disturbance existed before the great earthquake,and the abnormal variations of the ionospheric TEC may be precursors to the earthquake.
To analyze the variation of the ionospheric total electron content (TEC) around the earthquakes,we select the ionospheric TEC of 10 days before and after the Ms8.0 earthquake that occurred on May 12,2008 in Wenchuan as our research object.Adopting the statistical analysis method,the lonopsheric VTEC data during the earthquake has been analyzed and discussed in detail,using the VTEC data offered by IGS,together with the solar and geomagnetic information.Numerical results show that obvious TEC disturbance existed before the great earthquake,and the abnormal variations of the ionospheric TEC may be precursors to the earthquake.
引文
[1] Liu J Y,Chuo Y J,ShanSJ,TsaiYB,ChenYI,Pulinets S A,Yu S B,Pre-earthquake ionospherica nomalies registered by continuous GPSTEC measurements[J].Annales Geophysicae.2004,22:1585～1593．
[2] Stefan S,Wemer G.IONEX:The ionosphere map exchange format version 1[M].Proceeding of the IGS AC Workshop,1998．
[3] Sergey P.Ionospheric precursors of earthquakes; recent advances in theory and practical applications[J].TAO,2004,15(3) :413～435．
[4] Trigunait A,Parrot M,Pulinets S,Li F,Variations of the ionospheric electron density during the Bhuj seismic event.Annales Geophysicae,2004,22:4123～4131．
[5] 夏雅琴,刘程艳,李均之.大地震前震中上空电离层全电子含量异常研究[J].北京工业大学学报,2008,34(2) :220～224 Xia Y Q,Liu C Y,Li J Z.A Study of Pre-earthquake Ionosphere TF.C Anomalies Upper Epicenter[J].Journal of Beijing University of Technology.(in Chinese),2008,34(2) :220～224．
[6] 夏淳亮,万卫星,袁洪,等.2000年7月和2003年10月大磁暴期间东南亚低纬度电离层的GPS TEC的相应研究[J].空间科学学报,2005,25(4) :259～266． Xia C L,Wan W X,Yuan H,et al.Analysis of the intense magneticstorm of July,2000 and of October,2003 using the technique for nowcasting of GPS TEC data[J].Chin.J.SpaceSci (in Chinese),2005,25(4) :259～266．
[7] 张强,吴云,林剑,等.震前电离层TEC异常分析[J].大地测量与地球动力学,2007,27(3) :91～96． Zhang Q,Wu Y,Lin J,et al.On Ionospheric TEC Anomaly Before Earthquake[J].Journal of Geodesy and Geodtnamics.(in Chinese),2007,27(3) :91～96．
[8] http://rwcc.bao.ac.cn/
[9] http://www.leme.ac.cn/yubao2008-5． htm
[10] 蔡军涛,陈小斌,赵国泽,等.地震前兆:电离层F2层异常[J].地球物理学进展,2007,22(3) :720～728． Cai J T,Chen X B,Zhao G Z,et al.Earthquake precursor :the anomalies in the ionospheric F2 region[J].Progress in Geophvsics (in Chinese),2007,22(3) :720～728
[11] 徐全智,吕恕主编.概率论与数理统计[M].北京:高等教育出版社,2004．
[12] 赵国泽,陈小斌,蔡军涛.电磁卫星和地震预测[J].地球物理学进展,2007,22(3) :667～673． Zhao G Z,Chen X B,Cai J T.Electromagnetic observation by satellite and earthquake prediction[J].Progress in Geophysics (in Chinese),2007,22(3) :667～673．
[13] 李勇.行星地球的地震预警系统可监测汶川M8级地震[J].地球物理学进展,2008,23(3) :969～971． Li Y.Possibility to detect wenchuan M8 earthguake by the Earthquake Warning System[J].Progress in Geophysics (in Chinese),2008,23(3) :969～971．
[2] Stefan S,Wemer G.IONEX:The ionosphere map exchange format version 1[M].Proceeding of the IGS AC Workshop,1998．
[3] Sergey P.Ionospheric precursors of earthquakes; recent advances in theory and practical applications[J].TAO,2004,15(3) :413～435．
[4] Trigunait A,Parrot M,Pulinets S,Li F,Variations of the ionospheric electron density during the Bhuj seismic event.Annales Geophysicae,2004,22:4123～4131．
[5] 夏雅琴,刘程艳,李均之.大地震前震中上空电离层全电子含量异常研究[J].北京工业大学学报,2008,34(2) :220～224 Xia Y Q,Liu C Y,Li J Z.A Study of Pre-earthquake Ionosphere TF.C Anomalies Upper Epicenter[J].Journal of Beijing University of Technology.(in Chinese),2008,34(2) :220～224．
[6] 夏淳亮,万卫星,袁洪,等.2000年7月和2003年10月大磁暴期间东南亚低纬度电离层的GPS TEC的相应研究[J].空间科学学报,2005,25(4) :259～266． Xia C L,Wan W X,Yuan H,et al.Analysis of the intense magneticstorm of July,2000 and of October,2003 using the technique for nowcasting of GPS TEC data[J].Chin.J.SpaceSci (in Chinese),2005,25(4) :259～266．
[7] 张强,吴云,林剑,等.震前电离层TEC异常分析[J].大地测量与地球动力学,2007,27(3) :91～96． Zhang Q,Wu Y,Lin J,et al.On Ionospheric TEC Anomaly Before Earthquake[J].Journal of Geodesy and Geodtnamics.(in Chinese),2007,27(3) :91～96．
[8] http://rwcc.bao.ac.cn/
[9] http://www.leme.ac.cn/yubao2008-5． htm
[10] 蔡军涛,陈小斌,赵国泽,等.地震前兆:电离层F2层异常[J].地球物理学进展,2007,22(3) :720～728． Cai J T,Chen X B,Zhao G Z,et al.Earthquake precursor :the anomalies in the ionospheric F2 region[J].Progress in Geophvsics (in Chinese),2007,22(3) :720～728
[11] 徐全智,吕恕主编.概率论与数理统计[M].北京:高等教育出版社,2004．
[12] 赵国泽,陈小斌,蔡军涛.电磁卫星和地震预测[J].地球物理学进展,2007,22(3) :667～673． Zhao G Z,Chen X B,Cai J T.Electromagnetic observation by satellite and earthquake prediction[J].Progress in Geophysics (in Chinese),2007,22(3) :667～673．
[13] 李勇.行星地球的地震预警系统可监测汶川M8级地震[J].地球物理学进展,2008,23(3) :969～971． Li Y.Possibility to detect wenchuan M8 earthguake by the Earthquake Warning System[J].Progress in Geophysics (in Chinese),2008,23(3) :969～971．
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