GNSS数据在江苏地震前兆监测中的初步应用与研究
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摘要
GPS数据具有高精度、高效率和低成本等特点,同时不易受观测环境的变化影响,因此它在监测地壳的应力场变化、大震前可能出现的短期前兆、地震过程中观测点位的瞬时变化、震后地壳的运动特征等方面,具有很大的应用前景。主要是利用江苏区域溧阳、南通和盐城三个GNSS观测站,根据GPS定位原理,利用GAMIT软件计算出这三个站在2010年6月至2013年8月的时间序列,从计算结果中看出,在这三年里,这三个GNSS站均向东南方向偏移,2011年3月11日的日本地震均对这三个站引起永久性的同震位移,这三个站观测数据在NS、EW和垂直方向上均呈现出较好的年变特征。这是GNSS数据在江苏地震前兆监测中的初步应用,同时也为江苏区域的地震预测研究提供一个新的辅助手段。
By using the GAMIT software and the data of Liyang, Nantong and Yancheng GNSS observation stations, the paper calculates the displacement time series of Liyang, Nantong and Yancheng GNSS observation stations in Jiangsu province from June 2010 to August 2013 based on the GPS positioning principle. The results show that: among these years, the three GNSS stations move to the southeast direction; they have permanent coseismic displacement caused by the earthquake occurred in March 11 of 2011 in Japan; the observation data in NS, EW and the vertical direction of these three stations show better annual variation. This is the preliminary application of GNSS data in Jiangsu earthquake precursor monitoring, and also provides a new means for earthquake prediction research of Jiangsu area.
By using the GAMIT software and the data of Liyang, Nantong and Yancheng GNSS observation stations, the paper calculates the displacement time series of Liyang, Nantong and Yancheng GNSS observation stations in Jiangsu province from June 2010 to August 2013 based on the GPS positioning principle. The results show that: among these years, the three GNSS stations move to the southeast direction; they have permanent coseismic displacement caused by the earthquake occurred in March 11 of 2011 in Japan; the observation data in NS, EW and the vertical direction of these three stations show better annual variation. This is the preliminary application of GNSS data in Jiangsu earthquake precursor monitoring, and also provides a new means for earthquake prediction research of Jiangsu area.
引文
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[2]李延兴,王敏.应用空间技术GPS监测地震[J].中国空间科学技术,1993(3):49-57.
[3]魏洪峰.卡尔曼滤波在气象探测数据处理中的应用研究[J].气象仪器装备,2003,19(2):l-4.
[4]许国辉,张新长.卡尔曼滤波模型粗差的探测及其在施工变形测量中的应用[J].中山大学学报(自然科学版),2003,42(3):89-91.
[5]刘少明,贾民育.重力时变的数学逼近[J].地壳形变与地震,2001,21(3):49-54.
[6]陆彩萍,王解先.GPS监测地壳运动数据处理[J].大地测量与地球动力学,2002,22(4):6-60.
[7]李杰,王晓强,王琪,等.乌恰伽师地区GPS地壳运动监测网研究[J].内陆地震,2004,18(3):281-288.
[8]杨少敏,聂兆生,贾志革,等.GPS解算的日本Mw9.0级地震的远场同震地表位移[J].武汉大学学报·信息科学版,2011,36(11):1336-1339.
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