基于电离层层析成像技术探测汶川地震前电离层异常
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摘要
以2008年5月12日汶川Ms8.0地震为例,利用电离层层析成像技术重建了震前5月8—10日震中附近上空电离层的电子密度分布(UT9:00),发现5月9日出现电离层异常,且该异常在时空上与同一时段的电离层VTEC异常分布结果一致(排除空间天气活动对电离层造成的可能干扰后),认为该异常即是地震的电离层前兆信息。研究表明:电离层层析成像技术在地震预测研究领域有广阔的应用前景。
The technology of Computerized Ionospheric Tomography was used to reconstruct the distribution of electron density on UT9:00 from May 8th to May 10th,2008 before Wenchuan Ms8.0 earthquake that occurred on May 12th.It is found that an ionospheric anomaly had taken place on May 9th,and the aspect about when and where this anomaly occurred is consistent with the conclusion made by VTEC analysis.After eliminating the possible impacts that space weather event existed in the ionosphere,we can undoubtedly maintain that the ionospheric anomaly on May 9th is a precursor of Wenchuan earthquake.Integrating all mentioned above,our study indicates that Computerized Ionospheric Tomography has great opportunities to be widely applied in the field of earthquake prediction.
The technology of Computerized Ionospheric Tomography was used to reconstruct the distribution of electron density on UT9:00 from May 8th to May 10th,2008 before Wenchuan Ms8.0 earthquake that occurred on May 12th.It is found that an ionospheric anomaly had taken place on May 9th,and the aspect about when and where this anomaly occurred is consistent with the conclusion made by VTEC analysis.After eliminating the possible impacts that space weather event existed in the ionosphere,we can undoubtedly maintain that the ionospheric anomaly on May 9th is a precursor of Wenchuan earthquake.Integrating all mentioned above,our study indicates that Computerized Ionospheric Tomography has great opportunities to be widely applied in the field of earthquake prediction.
引文
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5卓裕荣.电离层地震前兆之研究[D].台北:国立中央大学,2002.(Zhuo Yurong.Preseismic ionosphere[D].Taibei:National Central University,2002)
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8祝芙英,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,(5):19-23.(Zhu Fuying,etal.Statistical analysis of pre-earthquake ionospheric TECdisturbance[J].Journal of Geodesy and Geodynamics,2010,(5):19-23)
9 Austen J R,et al.Ionospheric imaging using CT[J].RadioScience,1988,23:299-307.
10 VHajj G A,et al.Imaging the ionosphere with the global po-sitioning system[J].International Journal of Imaging Sys-tems and Technology,1994,5:174-184.
11吴雄斌,等.电离层CT数据采集和图像重建[J].遥感学报,2001,5(1):22-28.(Wu Xiongbin,et al.Data ac-quisition system and image reconstruction for computerizedionospheric tomography[J].Journal of Remote Sensing,2001,5(1):22-28)
12肖宏波.电离层层析成像及掩星反演方法[D].西安电子科技大学,2007.(Xiao Hongbo.Computerized iono-spheric tomography and ionospheric occultation inversiontechnique[D].Xidian University,2007)
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 advances on the ionospheric pre-cur-sors of earthquakes and ionospheric variations prior to Wen-chuan earthquake[J].Science and Technology Review,2008,26(11):30-34)
3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 toWenchuanMs8.0 earthquake[J].Journal of Geodesy andGeodynamics,2008,(6):16-21)
4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,(2):36-40.(Wu Yu,Qiao Xuejun and Zhou Yiyan.Preseismic iono-spheric TEC anomaly detected by ground-based GPS[J].Journal of Geodesy and Geodynamics,2005,(2):36-40)
5卓裕荣.电离层地震前兆之研究[D].台北:国立中央大学,2002.(Zhuo Yurong.Preseismic ionosphere[D].Taibei:National Central University,2002)
6 Sergey Pulinets.Ionospheric precursors of earthquakes;Re-cent advances in theory and practical applications[J].TAO,2004,15(3):413-435.
7 Liu J Y,et,al.Pre-earthquake ionospheric anomalies regis-tered by continuous GPS TEC measurements[J].AnnalesGeophysicae,2004,22:1 585-1 593.
8祝芙英,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,(5):19-23.(Zhu Fuying,etal.Statistical analysis of pre-earthquake ionospheric TECdisturbance[J].Journal of Geodesy and Geodynamics,2010,(5):19-23)
9 Austen J R,et al.Ionospheric imaging using CT[J].RadioScience,1988,23:299-307.
10 VHajj G A,et al.Imaging the ionosphere with the global po-sitioning system[J].International Journal of Imaging Sys-tems and Technology,1994,5:174-184.
11吴雄斌,等.电离层CT数据采集和图像重建[J].遥感学报,2001,5(1):22-28.(Wu Xiongbin,et al.Data ac-quisition system and image reconstruction for computerizedionospheric tomography[J].Journal of Remote Sensing,2001,5(1):22-28)
12肖宏波.电离层层析成像及掩星反演方法[D].西安电子科技大学,2007.(Xiao Hongbo.Computerized iono-spheric tomography and ionospheric occultation inversiontechnique[D].Xidian University,2007)
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