利用高频GPS进行地震动态变形分析及地震定位
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摘要
利用精密单点定位技术,得出了日本Mw 9.0地震中8个GPS站的动态变形序列。结果显示:GPS参考站震时最大形变量明显大于永久性变形,东向最大位移达5.9 m,北方向最大位移达1.8 m,水平位移总体朝向震中方向。根据各个参考站记录的地震波到达时间,得到了震中位置及S波传播速度。
The high-rate GPS data from 8 stations in the 2011 Mw9.0 Tohoku earthquake were processed by using precise point positioning,and the displacement time series at each GPS site were analyzed to derive displacement waveforms for this event.The results indicate that the maximum displacement of GPS stations during the earthquake is larger than the permanent deformation.The kinematic solutions show that the maximum amplitude of east and north displacement is up to 5.9 m,1.8 m respectively,and horizontal displacements were towards the epicenter on the whole.At last,the epicenter and the S wave velocity is derived from the arrival time recorded by the GPS stations in the region.
The high-rate GPS data from 8 stations in the 2011 Mw9.0 Tohoku earthquake were processed by using precise point positioning,and the displacement time series at each GPS site were analyzed to derive displacement waveforms for this event.The results indicate that the maximum displacement of GPS stations during the earthquake is larger than the permanent deformation.The kinematic solutions show that the maximum amplitude of east and north displacement is up to 5.9 m,1.8 m respectively,and horizontal displacements were towards the epicenter on the whole.At last,the epicenter and the S wave velocity is derived from the arrival time recorded by the GPS stations in the region.
引文
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2吴继忠.基于GPS观测的Baja California地震地壳变形分析[J].武汉大学学报(信息科学版),2011,36(4):437-440.(Wu Jizhong.Crustal deformation analysis derived from GPS observations during Baja California earthquake[J].Geomatics and Information Science of Wuhan Universi-ty,2011,36(4):437-440)
3徐韶光,等.汶川地震同震形变的静态和动态分析[J].大地测量与地球动力学,2010,(3):27-30.(Xu Sha-oguang,et al.Static and kinematic analysis od coseismic de-formation of wenchuan Ms8.0 earthquake[J].Journal of Geodesy and Geodynamics,2010,(3):27-30)
4施闯,等.卫星导航系统综合分析处理软件PANDA及研究进展[J].航天器工程,2009,18(4):64-69.(Shi Chuang,et al.PANDA:comprehensive processing software for satellite navigation systems and its research progress[J].Spacecraft Engineering,2009,18(4):64-69)
5 Blewitt,G.Fixed point theorems of GPS carrier phase ambi-guity resolution and their application to massive network pro-cessing:Ambizap[J]J.Geophys.Res.,2008,113(B12410):1-12.
6王敏,等.全球定位系统测定的2011年日本宫城Mw9.0级地震远场同震位移[J].科学通报,2011,56(20):1 593-1 596.(Wang Ming,et al.Far-field coseismic displace-ments associated with the 2011 Tohoku-oki earthquake in Ja-pan observed by Global Positioning System[J].Chinese Sci Bull,2011,56(20):1 593-1 596)
7方荣新,等.GPS地震仪:PANDA软件测试结果与验证[J].武汉大学学报(信息科学版),2011,36(4):453-456.(Fang Rongxin,et al.GPS Seismometer:PANDA soft-ware testing results and validation[J].Geomatics and In-formation Science of Wuhan University,2011,36(4):453-456)
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