汶川Mw7.9地震InSAR同震形变场的校检
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摘要
用GPS实测结果对由ALOS PALSAR数据获取的汶川Mw7.9地震InSAR同震形变场结果进行校检和误差分析,结果表明InSARLOS观测值含有断裂两侧的常数误差和断层单侧双线性误差。经分析,断层两侧的常数误差由断层破裂两侧相位差引起,单侧双线性误差可能是卫星轨道偏移误差引起的。用GPS结果校准后的InSAR同震形变场与根据地震波反演给出的形变场基本符合,InSAR形变误差约为5cm。
The InSAR coseismic deformation interferogrames derived from ALOS PALSAR data caused by the Wenchuan Mw7.9 earthquake was tested by using GPS measurements. There are constant errors between two sides of the rupture, and bilinear errors of one side of the rupture.It is believed that the constant errors is caused by the phase difference and bilinear errors by the satellite orbit offset error. The InSAR coseismic deformation field calibrated by GPS data are consistent with the forward model inverted from earthquake wave results,the error of calibrated InSAR coseismic deformation is about 5 cm.
The InSAR coseismic deformation interferogrames derived from ALOS PALSAR data caused by the Wenchuan Mw7.9 earthquake was tested by using GPS measurements. There are constant errors between two sides of the rupture, and bilinear errors of one side of the rupture.It is believed that the constant errors is caused by the phase difference and bilinear errors by the satellite orbit offset error. The InSAR coseismic deformation field calibrated by GPS data are consistent with the forward model inverted from earthquake wave results,the error of calibrated InSAR coseismic deformation is about 5 cm.
引文
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9 许才军,王华,黄劲松.GPS与InSAR数据融合研究展望[J].武汉大学学报(信息科学版),2003,28(专刊):58-78.(Xu Caijun,Wang Hua and Huang Jingsong.Prospect on the integration of GPS and InSAR data[J].Geomatics and Information Science of Wuhan University,2003,28(spec.):58-78)
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14 Global CMTWeb Page[EB/OL].http://www.globalcmt.org/
2 乔学军,郭利民.新疆伽师强震群的InSAR观测研究[J].大地测量与地球动力学,2007,(1):7-13.(Qaio Xuejun and Guo Limin.Study on Jiashi strong earthquake swarm area by InSAR[J].Journal of Geodesy and Geody-namics,2007,(1):7-13)
3 Lasserre C,et al.Coseismic deformation of the2001Mw7.8Kokoxili earthquake in Tibet,measuredby synthetic aperture radar interferometry[J].Journal of Ge-ophysical Research,2005,110,B12408,doi:10.1029/2004JB003500.
4 单新建,等.汶川Ms8.0地震InSAR同震形变场观测与研究[J].地球物理学报,2009,52(2):496-504.(Shan Xinjian,et a1.Coseismic surface deformation caused by the WenchuanMs8.0earthquake from InSAR data analysis[J].Chinese J.Geophys.,2009,52(2):496-504)
5 蒋弥,等.用L波段和C波段SAR数据研究汶川地震的同震形变场[J].大地测量与地球动力学,2009,(1):21-26.(Jiang Mi,et al.Study on coseismic deformation of Wenchuan earthquake by use of L and C wavebands of SAR data[J].Journal of Geodesy and Geodynamics,2009,(1):21-26)
6 谭凯,等.改则Ms6.9地震InSAR同震形变场模拟[J].大地测量与地球动力学,2009,(增刊):1-6.(Tan Kai,et al.Modeling InSAR coseismic deformation field caused by GaizeMs6.9earthquake in2008[J].Journal of Geodesy and Geodynamics,2009,(Supp.):1-6)
7 乔书波,等.GPS/VLBI/SLR/InSAR组合在地球动力学研究中的应用[J].大地测量与地球动力学,2004,(3):92-97.(Qiao Shubo,et al.Aplications of GPS/VLBI/SLR/In-SAR combination to geodynamics[J].Journal of Geodesy and Geodynamics,2004,(3):92-97)
8 陈基炜.InSAR-GPS-GIS数据整合在地面沉降研究中的应用[J].大地测量与地球动力学,2004,(3):87-91.(Chen Jiwei.InSAR-GPS-GIS data integration and applica-tion to detection of land subsidence[J].Journal of Geodesy and Geodynamics,2004,(3):87-91)
9 许才军,王华,黄劲松.GPS与InSAR数据融合研究展望[J].武汉大学学报(信息科学版),2003,28(专刊):58-78.(Xu Caijun,Wang Hua and Huang Jingsong.Prospect on the integration of GPS and InSAR data[J].Geomatics and Information Science of Wuhan University,2003,28(spec.):58-78)
10 Rosen P,et al.Updated repeat orbit interferometry package released[J].Eos.Trans.,AGU,2004,85:47.
11 Farr T,et al.The shuttle radar topography mission[J].Rev.Geophys.,2007,45:RG2005,doi:10.1029/2005RG000172.
12 Chen C and Zebker H.Network approaches to two-dimen-sional phase unwrapping:intractability and two new algo-rithms[J].J.Opt.Soc.Am.,2000,17:401-414.
13 张勇,等.2008年汶川大地震的时空破裂过程[J].中国科学D辑,2008,38(10):1186-1194.(Zhang Yong,et al.Spatio-temporal rupture process of the2008great Wenchuan earthquake[J].Science in China Series D,2008,38(10):1186-1194)
14 Global CMTWeb Page[EB/OL].http://www.globalcmt.org/
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