基于CODE GIM的震前电离层TEC异常分析
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摘要
利用CODE GIM数据分析了2008年5月12日汶川地震和2010年4月14日青海玉树地震震前电离层TEC变化。以震前10天TEC中位数为基准,1.5倍标准差为误差限值,并考虑相应时期的太阳和地磁活动水平(Dst指数和Kp指数),对震前电离层异常的分布进行了分析。结果表明,两次地震震前几天内都有TEC异常出现。
Pre-seismic ionospheric TEC anomalies of Wenchuan earthquake on May 12th 2008 and Yushu earthquake on April 14th 2010 were studied by using CODE GIM(Center for Orbit Determination in Europe,Grid Ionospheric Model) data.By considering the sun and geomagnetism activity levels(Dst index and Kp index),the ionospheric anomalies were analyzed with median of TEC 10 days earlier as basic values and 1.5 fold standard deviation as error limit.The results show that TEC anomalies before both the earthquakes can be detected.
Pre-seismic ionospheric TEC anomalies of Wenchuan earthquake on May 12th 2008 and Yushu earthquake on April 14th 2010 were studied by using CODE GIM(Center for Orbit Determination in Europe,Grid Ionospheric Model) data.By considering the sun and geomagnetism activity levels(Dst index and Kp index),the ionospheric anomalies were analyzed with median of TEC 10 days earlier as basic values and 1.5 fold standard deviation as error limit.The results show that TEC anomalies before both the earthquakes can be detected.
引文
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15 Zhu Fuying,Wu Yun and Fu Ningbo.Application of Kalmanfilter in detecting pre-earthquake ionospheric TEC anomaly[J].Geodesy and Geodynamics,2011,2(2):43-47.Doi:10.3724/SP.J.1246.2011.0043.
2赵必强,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):30-34.(ZhaoBiqiang,et al.Recent adveaces on the ionospheric pre-cur-sors of earthquakes and ionospheric variations prior to Wen-chun Earthquake[J].Science&Technology Review,2008,26(11):30-34)
3蔡军涛,等.地震前兆:电离层层异常[J].地球物理学进展,2007,22(3):720-728.(Cai Juntao,et al.Earth-quake precursor:the anomalies in the ionosphericregion[J].Progress in Geophys,2007,22(3):720-728)
4杨剑、吴云、周义炎.利用GPS无线电掩星数据研究震前电离层异常[J].大地测量与地球动力学,2008,(1):16-22.(Yang Jian,Wu Yun and Zhou Yiyan.Research onseismo-ionospheric anomalies using GPS radio occultationdata[J].Journal of Geodesy and Geodynamics,2008,(1):16-22)
5林剑,等.基于GPS探测汶川地震电离层TEC的异常[J].地球物理学报,2009,52(1):297-300.(Lin Jian,et al.Wenchuan earthquake ionosphere TEC anomaly detec-ted by GPS[J].Chinese J Geophys,2009,52(1):297-300)
6 Zhang Xuemin,et al.Ionospheric perturbations associatedwith the M8.6 Sumatra earthquake on 28 March 2005[J].Chinese J Geophys,2010,53(3):567-575.
7 Zakharenkova I E,et al.Anomalous modification of the ion-ospheric total electron content prior to the 26 September2005 Peru earthquake[J].Journal of Atmospheric and So-lar-Terrestrial Physics,2008,70:1 919-1 928.
8 Hsiao C C,et al.Ionospheric electron density anomaly priorto the December 26,2006 M7.0 Pingtung earthquake dou-blet observed by FORMOSAT-3/COSMIC[J].Physics andChemistry of the Earth,2009,34:474-478.
9张学民,等.汶川8级地震前空间电离层VLF电场异常现象[J].电波科学导报,2009,24(6):1 024-1 032.(Zhang Xuemin,et al.Ionosphere VLF electric field anom-alies before Wenchuan M8 earthquake[J].Chinese Journalof Radio Science,2009,24(6):1 024-1 032)
10祝芙英,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,(6):16-21.(ZhuFuying,et al.Study on ionospheric TEC anomaly prior toWenchuan Ms8.0 earthquake[J].Journal of Geodesy andGeodynamics,2008,(6):16-21)
11曾中超,等.利用DEMETER卫星数据分析汶川地震前的电离层异常[J].地球物理学报,2009,52(1):11-19.(Zeng Zhongchao,et al.The analysis of ionosphericvariations before Wenchuan earthquake with DEMETER da-ta[J].Chinese J Geophys,2009,52(1):11-19)
12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(信息科学版),2009,34(8):975-978.(Lin Jian,Wu Yun and Zhu Fuying.Ionosphere TECanomalous disturbance of pre-seismic[J].Geomatics andInformation Science of Wuhan University,2009,34(8):975-978)
13 Zhou Yiyan,et al.Anomalous variations of ionosphericVTEC before Ms8.0 Wenchuan earthquake[J].Chinese JGeophys,2010,53(3):556-566.
14 Zhou Yiyan,et al.Ionospheric anomalies detected byground-based GPS before the Mw7.9 Wenchuan earth-quake of May 12,2008,China[J].Journal of Atmos-pheric and Solar-Terrestrial Physics,2009,71:959-966.
15 Zhu Fuying,Wu Yun and Fu Ningbo.Application of Kalmanfilter in detecting pre-earthquake ionospheric TEC anomaly[J].Geodesy and Geodynamics,2011,2(2):43-47.Doi:10.3724/SP.J.1246.2011.0043.
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