使用ALOS DInSAR提取汶川地震同震地表形变场
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摘要
为探测汶川Ms8.0地震引起的地表形变,用ALOS卫星PALSAR L波段SAR数据与GPS观测数据,采用两轨雷达差分干涉方法,计算出了地震影响区约83 194 km2范围内的同震干涉图与形变场。此外,以16个GPS点的形变数据为参考,对干涉形变的精度进行分析,结果表明:除近断层区域两类数据存在较大差异外,整体吻合程度较高。
In order to detect surface deformation caused by the Wenchuan Ms8.0 earthquake,the two-pass differential interferometric synthetic aperture radar(DInSAR) method is employed for analyzing the ground displacement due to the main shock by using both the ALOS satellite PALSAR L-band SAR data and GPS data.We computed the coseismic interferogram and the deformation field with spatial resolution of 15 m in an area of about 83 194 km 2.Moreover,the accuracy of deformation values derived interferometrically is evaluated by taking the GPS measurements at 16 sites as the reference data.The results show that the two types of measurements are in good agreement,except that there exist remarkable discrepancy in the near-fault areas.
In order to detect surface deformation caused by the Wenchuan Ms8.0 earthquake,the two-pass differential interferometric synthetic aperture radar(DInSAR) method is employed for analyzing the ground displacement due to the main shock by using both the ALOS satellite PALSAR L-band SAR data and GPS data.We computed the coseismic interferogram and the deformation field with spatial resolution of 15 m in an area of about 83 194 km 2.Moreover,the accuracy of deformation values derived interferometrically is evaluated by taking the GPS measurements at 16 sites as the reference data.The results show that the two types of measurements are in good agreement,except that there exist remarkable discrepancy in the near-fault areas.
引文
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12单新建,等.汶川Ms8.0级地震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 al.Coseismic surface deformationcaused by the WenchuanMs8.0 earthquake from InSARdata analysis[J].Chinese Journal of Geophysics,2009,52(2):496-504)
13屈春燕,等.汶川Ms8.0地震InSAR同震形变场特征分析[J].地震地质,2008,30(4):1 076-1 084.(Qu Chu-nyan,et al.Analysis on the characteristics of InSAR co-seismic deformation of theMs8.0 Wenchuan earthquake[J].Seismology and Geology,2008,30(4):1 076-1 084)
14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[J].大地测量与地球动力学,2009,(1):21-26.(Jiang Mi,et al.Study on coseismic deformation ofWenchuan earthquake by use of L and C wavebangs of SARdata[J].Journal of Geodesy and Geodynamics,2009,(1):21-26)
15王超,等.星载合成孔径雷达干涉测量[M].北京:科学出版社,2002.(Wang Chao,Zhang Hong and Liu Zhi.Space-borne synthetic aperture radar interferometry[M].Beijing:Science Press,2002)
16舒宁.雷达影像干涉测量原理[M].武汉:武汉大学出版社,2003.(Shu Ning.Principles of Radar interferometry[M].Wuhan:Press of Wuhan University,2002)
17陈桂华,等.2008年汶川Ms8.0地震多断裂破裂的近地表同震滑移及滑移分解[J].地球物理学报,2009,52(5):1 384-1 394.(Chen Guihua,et al.Co-seismic slipand slip partitioning of multi-faults during theMs8.0 2008Wenchuan earthquake[J].Chinese Journal of Geophys-ics,2009,52(5):1 384-1 394)
18华卫,等.汶川8.0级地震触发与余震活动空间分布研究[J].地震,2009,29(1):33-39.(Hua Wei,et al.Seismic triggering and the aftershock distribution of theWenchuanMs8.0 earthquake[J].Earthquake,2009,29(1):33-39)
19 Kobayashi T,et al.Locations and types of ruptures in-volved in the 2008 Sichuan earthquake inferred from SARimage matching[J].Geophysical Research Letters,2009,36,L07302,doi:10.1029/2008GL036907.
2焦青,等.汶川8.0级地震前后龙门山断裂活动特征浅析[J].大地测量与地球动力学,2008,(3):6-11.(JiaoQing,et al.Preliminary study on moyion characteristics ofLongmenshan fault before and afterMs8.0 Wenchuan earth-quake[J].Journal of Geodesy and Geodynamics,2008,(3):6-11)
3徐锡伟,等.汶川Ms8.0地震地表破裂带及其发震构造[J].地震地质,2008,30(3):587-629.(Xu Xiwei,etal.TheMs8.0 Wenchuan earthquake surface ruptures andits seismogenic structure[J].Seismology and Geology,2008,30(3):587-629)
4 Lin A,et al.Co-seismic thrusting rupture and slip distribu-tion produced by the 2008Mw7.9 Wenchuan earthquake,China[J].Tectonophysics,2009,471:203-215.
5张培震.GPS测定的2008年汶川Ms8.0级地震的同震位移场[J].中国科学,2008,38(10):1 195-1 206.(Zhang Peizhen.Co-seismic deformation field of 2008Ms8.0 Wenchuan earthquake revealed by GPS data[J].Since in China,2008,38(10):1 195-1 206)
6顾国华,王武星.GPS测得的汶川大地震同震位移[J].地震,2009,29(1):92-99.(Gu Guohua and Wang Wux-ing.Coseismic displacements from the 2008 WenchuanMs8.0 earthquake observed by GPS[J].Earthquake,2009,29(1):92-99)
7田勤俭,等.汶川8.0级地震及余震破裂的地质构造特征[J].地震,2009,29(1):141-148.(Tian Qinjian,et al.Earthquake geology of the WenchuanMs8.0 mainshock andits aftershocks[J].Earthquake,2009,29(1):141-148)
8 Liu G X,et al.Mapping surface deformation related to the2008 Wenchuan earthquake with ALOS InSAR and GPS ob-servations,Proc.SPIE,2009,7471:74711N-74711N-8,doi:10.1117/12.836306.
9 Ge L L,et al.Preliminary results of satellite radar differen-tial interferometry for the co-seismic deformation of the 12May 2008Ms8.0 Wenchuan earthquake[J].Geographic In-formation Sciences,2008,14(1):12-19.
10 Hao K X,et al.Coseismic surface-ruptures and crustal de-formations of the 2008 Wenchuan earthquakeMw7.9,Chi-na[J].Geophysical Research Letters,2009,36,L11303,doi:10.1029/2009GL037971.
11孙建宝,等.汶川Ms8.0地震InSAR形变观测及初步分析[J].地震地质,2008,30(3):789-795.(Sun Jianbao,et al.InSAR deformation observation and preliminary anal-ysis of theMs8.0 Wenchuan earthquake[J].Seismologyand Geology,2008,30(3):789-795)
12单新建,等.汶川Ms8.0级地震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 al.Coseismic surface deformationcaused by the WenchuanMs8.0 earthquake from InSARdata analysis[J].Chinese Journal of Geophysics,2009,52(2):496-504)
13屈春燕,等.汶川Ms8.0地震InSAR同震形变场特征分析[J].地震地质,2008,30(4):1 076-1 084.(Qu Chu-nyan,et al.Analysis on the characteristics of InSAR co-seismic deformation of theMs8.0 Wenchuan earthquake[J].Seismology and Geology,2008,30(4):1 076-1 084)
14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[J].大地测量与地球动力学,2009,(1):21-26.(Jiang Mi,et al.Study on coseismic deformation ofWenchuan earthquake by use of L and C wavebangs of SARdata[J].Journal of Geodesy and Geodynamics,2009,(1):21-26)
15王超,等.星载合成孔径雷达干涉测量[M].北京:科学出版社,2002.(Wang Chao,Zhang Hong and Liu Zhi.Space-borne synthetic aperture radar interferometry[M].Beijing:Science Press,2002)
16舒宁.雷达影像干涉测量原理[M].武汉:武汉大学出版社,2003.(Shu Ning.Principles of Radar interferometry[M].Wuhan:Press of Wuhan University,2002)
17陈桂华,等.2008年汶川Ms8.0地震多断裂破裂的近地表同震滑移及滑移分解[J].地球物理学报,2009,52(5):1 384-1 394.(Chen Guihua,et al.Co-seismic slipand slip partitioning of multi-faults during theMs8.0 2008Wenchuan earthquake[J].Chinese Journal of Geophys-ics,2009,52(5):1 384-1 394)
18华卫,等.汶川8.0级地震触发与余震活动空间分布研究[J].地震,2009,29(1):33-39.(Hua Wei,et al.Seismic triggering and the aftershock distribution of theWenchuanMs8.0 earthquake[J].Earthquake,2009,29(1):33-39)
19 Kobayashi T,et al.Locations and types of ruptures in-volved in the 2008 Sichuan earthquake inferred from SARimage matching[J].Geophysical Research Letters,2009,36,L07302,doi:10.1029/2008GL036907.
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