震前电离层TEC异常扰动的研究
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摘要
利用中国地壳运动观测网络基准站观测数据,计算了2008年3～8月期间的中国区域电离层电子总含量(totalelectron content,TEC),并根据CODE分析中心最终TEC数据,采用不同尺度的统计分析方法,对半年来四川地震上空TEC值进行检查。结果表明,在5.12汶川地震震前一个星期内,孕震区上空连续出现明显的电离层异常扰动(在一定的经度范围内),其电离层异常驼峰有向磁赤道漂移的趋势,并逐步完全消失;对于此后发生的大于Ms5.0的地震,75%的地震区域同样发生此类现象。
Using the observational data of fiducial station in the crustal movement observation network of China,the total electron content of Chinese region from March to August 2008 are calculated. Being assisted by the final TEC of CODE analysis center,adopting different scale statistical analysis method,we examined the TEC on sichuan earthquake. As a result,we found that the anomalous VTEC disturbances over the preparation zone of Wenchuan earthquake continuously took place in a preseismic week,which shift to magnetic equator and disappeared completely step by step.
Using the observational data of fiducial station in the crustal movement observation network of China,the total electron content of Chinese region from March to August 2008 are calculated. Being assisted by the final TEC of CODE analysis center,adopting different scale statistical analysis method,we examined the TEC on sichuan earthquake. As a result,we found that the anomalous VTEC disturbances over the preparation zone of Wenchuan earthquake continuously took place in a preseismic week,which shift to magnetic equator and disappeared completely step by step.
引文
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[8]许承权.单频GPS精密单点定位算法研究与程序实现[D].武汉:武汉大学,2008
[9]刘经南,陈俊勇,张燕平,等.广域差分GPS原理和方法[M].北京:测绘出版社,1999
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[11]Yuan Yunbin,OU Jikun.Preli minary Results and Analyses of Using IGS GPS Data to Determine Global Ionospheric TEC[J].Progress in Natural Science,2003,13(6):446-450
[12]Wilson B D,Mannucci A J,Edwards C D,et al.Subdaily Northern Hemisphere Ionospheric Maps Using an Extensive Network of GPS Receivers[J].Radio Science,1995,30(3):639-648
[13]Pulinets S A,Legenka A D,Gaivoronskaya T V,et al.Main Phenomenological Features of Ionospheric Precursors of Strong Earthquakes[J].Journal of At mospheric and solar-terrestrial Physics,2003,65:1337-1347
[14]Pulinets S A.Seismic Activity as a Source of the I-onospheric Variability[J].Adv Space Research,1998,22(6):903-906
[15]Ulinets S A.Ionospheric Precursors of Earth-quakes;Recent Advances in Theory and Practical Applications[J].TAO,2004,15(3):413-415
[2]Leonard R S,Barnes R A.Observation of Iono-spheric Disturbances Following the Alaska Earth-quake[J].J Geophys Res,1965,70:1250-1253
[3]Sorokina V M,Chmyrevb V M,Yaschenko A K.Theoretical Model of DC Electric Field Formationin the Ionosphere Sti mulated by Seismic Activity[J].Journal of At mospheric and Solar-Terrestrial Phys-ics,2005,67:1259-1268
[4]Zaslavski Y,Parrot M,Blance E.Analysis of VTEC Measurements Above Active Seismic Regions[J].Phys Earth Planet Int,1998,105:219-228
[5]卓裕荣.电离层地震前兆之研究[D].台北:中央大学太空科学所,2002
[6]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
[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.信息科学版,2008,33(1):81-84
[8]许承权.单频GPS精密单点定位算法研究与程序实现[D].武汉:武汉大学,2008
[9]刘经南,陈俊勇,张燕平,等.广域差分GPS原理和方法[M].北京:测绘出版社,1999
[10]Feltens J.IGS Products for the Ionosphere[C].The IGS Analysis Centers Workshop,Darmstadt,Germa-ny,1998
[11]Yuan Yunbin,OU Jikun.Preli minary Results and Analyses of Using IGS GPS Data to Determine Global Ionospheric TEC[J].Progress in Natural Science,2003,13(6):446-450
[12]Wilson B D,Mannucci A J,Edwards C D,et al.Subdaily Northern Hemisphere Ionospheric Maps Using an Extensive Network of GPS Receivers[J].Radio Science,1995,30(3):639-648
[13]Pulinets S A,Legenka A D,Gaivoronskaya T V,et al.Main Phenomenological Features of Ionospheric Precursors of Strong Earthquakes[J].Journal of At mospheric and solar-terrestrial Physics,2003,65:1337-1347
[14]Pulinets S A.Seismic Activity as a Source of the I-onospheric Variability[J].Adv Space Research,1998,22(6):903-906
[15]Ulinets S A.Ionospheric Precursors of Earth-quakes;Recent Advances in Theory and Practical Applications[J].TAO,2004,15(3):413-415
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