基于GPS探测汶川地震电离层TEC的异常
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摘要
利用球谐模型和中国地壳运动观测网络及IGS(International GNSS Service)基准站的GPS观测数据,分别计算了中国区域及全球电离层电子总含量(Total Electron Content,TEC),采用了不同的统计分析方法,对汶川震中上空及邻近区域的TEC进行检查.结果发现:震前后一个星期,孕震区上空连续出现电离层异常扰动,其异常形态具有共轭结构,且呈现向磁赤道漂移趋势.
Utilizing spherical harmonic model,the GPS observational data of fiducial station in the crustal movement observation network of China and IGS fiducial station,calculating the total electron content of Chinese and global region respectively,and adopting different statistical analysis method,we examined the TEC on Wenchuan epicenter and around the region.As a result,we found that the anomalous VTEC disturbances over seismic preparation zone continuously took place in a week before and after the earthquake,whose form had conjugate structure and shifted to magnetic equatora.
Utilizing spherical harmonic model,the GPS observational data of fiducial station in the crustal movement observation network of China and IGS fiducial station,calculating the total electron content of Chinese and global region respectively,and adopting different statistical analysis method,we examined the TEC on Wenchuan epicenter and around the region.As a result,we found that the anomalous VTEC disturbances over seismic preparation zone continuously took place in a week before and after the earthquake,whose form had conjugate structure and shifted to magnetic equatora.
引文
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[6]刘经南,陈俊勇,张燕平等.广域差分GPS原理和方法.北京:测绘出版社,1999Lin J N,Chen J Y,Zhang Y P,et al.Principle and Methods of Wide Area Difference GPS(in Chinese).Beijing:Surveying and Mapping Press,1999
[7]Feltens J,Schaer S.IGS Products for the ionosphere,IGS position paper.In:Proceedings of the1998IGS Analysis Centers Workshop.ESOC,Darmstadt,Germany,1998.225～232
[8]Yuan YB,OUJ K.Preliminary results and analyses of using IGS GPS data to determine global ionospheric TEC.Progress in Natural Science,2003,13(8):446
[9]Wilson B D,Mannucci A J,Edwards C D,et al.Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers.Radio Science,1999,30:639
[10]Pulinets S A,Legenka A D,Gaivoronskaya T V,et al.Main phenomenological features of ionospheric precursors of strong earthquakes.Journal of At mospheric and Solar-terrestrial Physics,2003,(65):1337～1347
[11]Pulinets S A.Seismic activity as a source of the ionospheric variability.Adv.Space Research,1998,22(6):903～906
[12]Pulinets S A.Ionospheric precursors of earthquakes;recent advances in theory and practical applications.TAO,2004,15(3):413～415
[2]Sorokina V M,Chmyrevb V M,Yaschenko A K.Theoretical model of DC electric field formation in the ionosphere stimulated by seismic activity.Journal of At mospheric and Solar-Terrestrial Physics,2005,67:1259～1268
[3]卓裕荣.地震电离层前兆[博士论文].台北:国立中央大学,2002Zhuo Y R.Preseismic ionosphere[Ph D.thesis].Taibei:National Central University,2002
[4]Liu J Y,Chen YI,Chou YJ,et al.Variation of ionospheric total electron content during the Chi-Chi earthquake.Geophysical Research Letters,2001,28(7):1383～1386
[5]许承权.单频GPS精密单点定位算法研究与程序实现[博士论文].武汉:武汉大学,2008Xu C Q.The algorithmreaserch and software development of single frequency precise point positioning[Ph.D.thesis].Wuhan:Wuhan University,2008
[6]刘经南,陈俊勇,张燕平等.广域差分GPS原理和方法.北京:测绘出版社,1999Lin J N,Chen J Y,Zhang Y P,et al.Principle and Methods of Wide Area Difference GPS(in Chinese).Beijing:Surveying and Mapping Press,1999
[7]Feltens J,Schaer S.IGS Products for the ionosphere,IGS position paper.In:Proceedings of the1998IGS Analysis Centers Workshop.ESOC,Darmstadt,Germany,1998.225～232
[8]Yuan YB,OUJ K.Preliminary results and analyses of using IGS GPS data to determine global ionospheric TEC.Progress in Natural Science,2003,13(8):446
[9]Wilson B D,Mannucci A J,Edwards C D,et al.Subdaily northern hemisphere ionospheric maps using an extensive network of GPS receivers.Radio Science,1999,30:639
[10]Pulinets S A,Legenka A D,Gaivoronskaya T V,et al.Main phenomenological features of ionospheric precursors of strong earthquakes.Journal of At mospheric and Solar-terrestrial Physics,2003,(65):1337～1347
[11]Pulinets S A.Seismic activity as a source of the ionospheric variability.Adv.Space Research,1998,22(6):903～906
[12]Pulinets S A.Ionospheric precursors of earthquakes;recent advances in theory and practical applications.TAO,2004,15(3):413～415
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