利用GPS无线电掩星数据研究震前电离层异常
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摘要
利用COSMIC掩星观测得到的电离层电子密度,研究了2006年11月15日日本千岛Ms8.0地震和2007年2月25日青海海西Ms5.3地震临震前震区上空附近电子密度的异常变化,通过与K指数(磁暴)对比分析,发现其异常变化与外层空间的干扰无关。研究结果证实,GPS无线电掩星技术可以监测到临震前震中区上空附近的电子密度的异常变化,而异常变化极有可能是由地震引起的。
The anomalous changes of the ionospheric electronic density in the space over the regions of Kuril Islands earthquake on Nov. 15,2006 and Haixi(China) earthquake on Feb. 25,2007 had been observed by use of the GPS radio occultation for COSMIC satellite before those events and those anomalies were proved through refering to the indices K from Wuhan geomagnetic station as it was not related to the influences from actions in outer space.Therefore,it can be concluded that the GPS radio occultation technique can be used for monitoring the anomalous change of ionospheric electromic density in the space over the region where an earthquake may occur imminently because these anomalies are probably caused by the generation of earthquakes.
The anomalous changes of the ionospheric electronic density in the space over the regions of Kuril Islands earthquake on Nov. 15,2006 and Haixi(China) earthquake on Feb. 25,2007 had been observed by use of the GPS radio occultation for COSMIC satellite before those events and those anomalies were proved through refering to the indices K from Wuhan geomagnetic station as it was not related to the influences from actions in outer space.Therefore,it can be concluded that the GPS radio occultation technique can be used for monitoring the anomalous change of ionospheric electromic density in the space over the region where an earthquake may occur imminently because these anomalies are probably caused by the generation of earthquakes.
引文
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14http://www.cosmic.ucar.edu/[EB/OL].
2丁鉴海,等.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):536-542.2Ding Jianhai,et al.Phenomena of geomagnetic and iono-spheric anomalies and their relation to earthquakes[J].Chin.J.Space Sci.,2005,25(6):536-542.(in Chi-nese)
3吴云,等.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):36-40.3Wu Yun,et al.Preseismic ionospheric TEC anomaly detec-ted by ground-based GPS[J].Journal of Geodesy and Geo-dynamics,2005,25(2):36-40.(in Chinese)
4张强,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):91-96.4Zhang Qiang,et al.On ionospheric TEC anomaly before earthquake[J].Journal of Geodesy and Geodynamics,2007,27(3):91-96.(in Chinese)
5张强.地基GPS监测电离层TEC及其与地震活动关系的研究[D].武汉:中国地震局地震研究所硕士学位论文,2007.5Zhang Qiang.Research on the relation of ionospheric total e-lectron content and earthquake by ground based GPS obser-vation[D].Wuhan:Institute of Seismology,CEA,2007.(in Chinese)
6Liu J Y,Chen Y I,Chou Y J,et al.Variation of ionospheric total electron content during the Chi-Chi earthquake[J].geo-physical Research Letters,2001,28(7):1383-1386.
7Plotkin VV.GPS detection of ionospheric perturbation before the13February2001,E1Salvador earthquake[J].Natural Hazards and Earth System Science,2003,3:249-253.
8Trigunait A,Parrot M,Pulinets S A,et al.Variation of iono-spheric electron density during the Bhuj seismic event[J].Annales Geophysicae2004,22:4123-4131.
9Liu J Y,et al.Pre-earthquake ionospheric anomalies regis-tered by continuous GPS TEC measurements[J].Annales Geophysicae,2004,22:1585-1593.
10胡雄,等.无线电掩星技术及其应用[J].电波科学学报,2002,17(5):549-556.10Hu Xiong,et al.Radio occultation and its application[J].Chinese Journal of Radio Science,2002,17(5):549-556.(in Chinese)
11周义炎,等.GPS掩星技术和电离层反演[J].大地测量与地球动力学,2005,25(2):29-35.11Zhou Yiyan,et al.GPS occultation technique and iono-spheric inversion[J].Journal of Geodesy and Geodynam-ics,2005,25(2):29-35.(in Chinese)
12吴小成,等.电离层GPS掩星观测改正TEC反演方法[J].地球物理学报,2006,49(2):328-334.12Wu Xiaocheng,et al.A calibrated TEC method for inver-sion of ionospheric GPS occultation data[J].Chinese J.Geophys.,2006,49(2):328-334.(in Chinese)
13曾桢,等.电离层GPS掩星观测反演技术[J].地球物理学报,2004,47(4):578-583.13Zeng Zhen,et al.Inversion of ionospheric GPS occultation data[J].Chinese Journal of Geophysics,2004,47(4):578-583.(in Chinese)
14http://www.cosmic.ucar.edu/[EB/OL].
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