2012年4月苏门答腊岛地震电离层电子密度异常研究
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摘要
利用GPS电离层层析技术对苏门答腊岛上空4月1日至15日的电离层三维电子密度空间分布进行重建,采用2倍标准差方法对反演出的电子密度值进行异常探测。在排除太阳活动和地磁干扰的情况下,发现在11日UT10:00,13日UT6:00,14日UT6:00—14:00,15日UT14:00—16:00时间段出现较大范围的电离层电子密度异常,且分布在震中上空附近,初步认为该异常与4月苏门答腊岛地震有关。
Using the technology of ionospheric tomography,three-dimensional ionospheric electronic density maps from April 1st to 15th in 2012 were reconstructed near the epicenter of Sumatra,The electron density anomaly detection is based on the doubled standard deviation.After excluding the solar activity and geomagnetic disturbance,the abnormal ionospheric electron density happened at the UT 10:00 on 11th,UT 6:00 on 13th,UT 6:00-14:00 on 14th,UT 14:00-16:00 on 15th,and they distributed mainly near the epicenter.The anomalies are likely a premise of the Sumatra earthquake in April.
Using the technology of ionospheric tomography,three-dimensional ionospheric electronic density maps from April 1st to 15th in 2012 were reconstructed near the epicenter of Sumatra,The electron density anomaly detection is based on the doubled standard deviation.After excluding the solar activity and geomagnetic disturbance,the abnormal ionospheric electron density happened at the UT 10:00 on 11th,UT 6:00 on 13th,UT 6:00-14:00 on 14th,UT 14:00-16:00 on 15th,and they distributed mainly near the epicenter.The anomalies are likely a premise of the Sumatra earthquake in April.
引文
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3 Sergey Pulinets.Ionospheric precursors of earthquakes;Re-cent advances intheory andpractical applications[J].TAO,2004,15(3):413-435.
4 Liu J Y,et,al.Pre-earthquake ionospheric anomalies regis-teredby continuous GPS TEC measurements[J].AnnalesGeophysicae,2004,22:1 585-1 593.
5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.Statisical analysis of pre-earthquake ionospheric TEC dis-turbance[J].Journal of Geodesy and Geodynamics,2010,(5):19-23)
6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,etal.Wenchuan earthquake ionosphere TEC anomaly detectedby GPS[J].Chinese Journal of Geophysics,2009,52(1):297-300)
7闻德保.基于GPS的电离层层析算法及其应用研究[D].中国科学院测量与地球物理研究所,2007.(Wen Debao.Investigation of GPS-based ionospheric tomographic algo-rithms and their applications[D].Institute of Geodesy andGeophysics,Chinese Academy of Sciences,2007)
8 Thomas Dautermann.Investigation of ionospheric electroncontent variations before earthquakes in southern California,2003-2004[J].Journal of Geophysical Research,2007,112,B02106.
9陈必焰.电离层层析技术及应用[D].中南大学,2012.(Chen Biyan.Ionospheric tomographic technology and appli-cations[D].Central South University,2012)
10肖宏波,史小红,王晓颖.电离层层析成像的一种改进算法[J].西安工业大学学报,2008,28(2):115-118.(XiaoHongbo,Shi Xiaohong and Wang Xiaoying.Improved algo-rithm for computerized ionospheric tomography[J].Journalof Xi’an Technological University,2008,28(2):115-118)
11欧吉坤.误差理论若干问题研究—兼论大气对GPS测量的影响[D].中国科学院测量与地球物理研究所,1994.(Ou Jikun.Error theory-discussing the atmosphereGPS measurements[D].Institute of Geodesy and Geophys-ics,CAS,1994)
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