2011年3月24日缅甸地震期间电离层TEC异常分析
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摘要
基于IGS提供的2011年3月全球TEC数据,利用滑动时窗进行异常识别的方法,分析电离层赤道异常区TEC在缅甸地震期间的异常情况。结果表明:在震前10 d内,地震上空电离层TEC出现了明显的异常扰动,电离层异常北驼峰在16日至18日期间出现了明显的较大区域负异常现象,且在18日时北驼峰明显向磁赤道漂移,负异常在19日时基本消失;而在地震发生的当天和震后一天出现了小范围的正异常,随后正异常消失。在地震期间地磁活动水平总体都相当平静,且太阳处于一个相对较稳定的中低活动水平,电离层出现的异常很可能与此次缅甸地震有关。
This paper analysis the ionospheric anomalies observed during the strong earthquake(M=7.2) which occurred in Burma(20.8°N,99.8°W) during March 2011.As a result,we found that the anomalous TEC disturbances over the zone of Burma earthquake,which took place ten days before the events: at the beginning,the TEC of equatorial ionization anomaly(EIA) north crest was decreasing during March 16-18,and the North crest moved toward equator at March 18,and the anomalous of the TEC disappeared completely step by step.The geomagnetic situations were rather quiet on the days during the earthquakes,and solar activity was in a relatively stable middle-low level.We can conclude that the observed anomalous of the ionospheric TEC was likely associated with the imminent earthquake.
This paper analysis the ionospheric anomalies observed during the strong earthquake(M=7.2) which occurred in Burma(20.8°N,99.8°W) during March 2011.As a result,we found that the anomalous TEC disturbances over the zone of Burma earthquake,which took place ten days before the events: at the beginning,the TEC of equatorial ionization anomaly(EIA) north crest was decreasing during March 16-18,and the North crest moved toward equator at March 18,and the anomalous of the TEC disappeared completely step by step.The geomagnetic situations were rather quiet on the days during the earthquakes,and solar activity was in a relatively stable middle-low level.We can conclude that the observed anomalous of the ionospheric TEC was likely associated with the imminent earthquake.
引文
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[2]杨马陵,邓柏昌,赵文化,等.两次强震前华南地区电离层TEC异常特征研究[J].大地测量与地球动力学,2009,29(6):13-21.
[3]吴云,乔学军,周义炎.利用地基GPS探测震前电离层TEC异常[J].大地测量与地球动力学,2005,25(2):36-40.
[4]赵必强,万卫星,王敏,等.震前电离层扰动研究进展及汶川地震前电离层变化[J].科技导报,2008,26(11):30-40.
[5]丁鉴海,索玉成,余素荣.地磁场与电离层异常现象及其与地震的关系[J].空间科学学报,2005,25(6):536-542.
[6]黄江,邓柏昌,徐杰,等.2009年6至7月华南地区电离层TEC扰动研究[J].空间科学学报,2011,31(6):739-746.
[7]孟泱,王泽民,鄂栋臣.基于GPS数据的地震前电离层TEC异常研究[J].武汉大学学报,2008,33(1):81-84.
[8]祝芙英,吴云,林剑,等.汶川Ms8.0地震前电离层TEC异常分析[J].大地测量与地球动力学,2008,28(6):16-21.
[9]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.
[10]林剑,吴云,祝芙英.震前电离层TEC异常扰动的研究[J].武汉大学学报,2009,34(8):975-978.
[11]祝芙英,吴云,林剑,等.震前电离层TEC异常扰动统计分析[J].大地测量与地球动力学,2010,30(5):19-23.
[12]邓柏昌,杨马陵,黄江,等.汶川地震前华南地基GPS探测电离层TEC异常的研究[J].华南地震,2009,29(4):13-17.
[13]Dobrovolsky I P,Zubkov S I,Miachkin V I.Estimation of the size of earthquake preparation zones[J].Pureand Apply Geophysics,1979,117:1025-1044.
[14]Barnes R S.Observation of ionospheric disturbances following the Alaska earthquake[J].Annales Geophy-sicae,1985,3:673-688.
[15]Liu J Y.Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements[J].AnnalesGeophysicae,2004,22:1585-1593.
[16]Liu J Y,Chuo C H,Chen Y I,el al.Seismo-geomagnetic anomalies and M 5.0 earthquakes observed inTaiwan during 1988~2001[J].Physics and Chemistry of the Earth,2006,31:215-222.
[17]Liu J Y,Chen Y I,Pulinets S A,el al.Seismo-geomagnetic signature prior to M>=6.0 Taiwan earthquakes[J].Geophysical Research Letters,2000,27(19):3113-3116.
[18]Antsilevich M G.The influence of Tashkent earthquake on the Earth's magnetic field and the ionosphere,Tashkent earthquake 26[J].1997,15:187-188.
[19]Widdy A M,Mardina A.Norbahiah M.Ionospheric TEC response over Simeulue earthquake of 28 March2005[c].IconsSpace.2009:175-178.
[20]I.E.Zakharenkova,I.I.Shagimuratov,N.Y.Tepenitzina,el al.Anomalous modification of the ionospheric totalelectron content prior to the 26 September 2005 Peru earthquake[J].Journal of Atmospheric and Solar-Terrestrial Physics.2008,70:1919-1928.
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