利用InSAR数据的汶川地震形变场提取及分析
|
摘要
以2008年5月12日发生在中国四川的Mw 7.9级汶川地震为研究对象,由于汶川地震发生在植被覆盖茂密、地形起伏大的龙门山山区,常规的C波段雷达在这些区域几乎得不到任何有意义的信号,采用日本JAXA的L波段ALOS/PALSAR覆盖震区的震前和震后6个条带的卫星数据,以SRTM-DEM数据作为外部DEM,利用GAMMA软件进行二通差分干涉测量处理,获取了覆盖震区的同震形变场;并使用国家重大科学工程"中国地壳运动观测网络"项目组公布的震区GPS同震观测结果,与InSAR观测结果进行了比较分析,表明两者之间具有很好的一致性,通过传统差分干涉获取到的形变量精度可以达到cm级。
On 12 May 2008,a Mw 7.9 Wenchuan Earthquake occurred in Sichuan Province,China,which is located in Longmenshan mountain area with bald relief and dense vegetation.The smaller wavelength(C-band) system can not provide high quality interferograms.In order to map co-seismic deformation in earthquake region,the SAR data collected by L band ALOS/PALSAR sensor of JAXA are used in the study,including before and after the quake from six paths.A two-pass differential InSAR technology and external DEM acquired by SRTM mission are employed in GAMMA software to generate the co-seismic deformation field.GPS observation results of co-seismic deformation surveyed by Chinese national large scientific project-Crustal Movement Observation Network of China(CMONC) project team are used to evaluate the InSAR observations.The result shows that there is a high consistent between GPS and InSAR observations.And accuracy of line of sight surface displacement derived from traditional InSAR technique can achieve cm-level.
On 12 May 2008,a Mw 7.9 Wenchuan Earthquake occurred in Sichuan Province,China,which is located in Longmenshan mountain area with bald relief and dense vegetation.The smaller wavelength(C-band) system can not provide high quality interferograms.In order to map co-seismic deformation in earthquake region,the SAR data collected by L band ALOS/PALSAR sensor of JAXA are used in the study,including before and after the quake from six paths.A two-pass differential InSAR technology and external DEM acquired by SRTM mission are employed in GAMMA software to generate the co-seismic deformation field.GPS observation results of co-seismic deformation surveyed by Chinese national large scientific project-Crustal Movement Observation Network of China(CMONC) project team are used to evaluate the InSAR observations.The result shows that there is a high consistent between GPS and InSAR observations.And accuracy of line of sight surface displacement derived from traditional InSAR technique can achieve cm-level.
引文
[1]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构成成因[J].地球物理学报,2008,51(4):1 066-1 073
[2]Massonnet D,Rossi M,Carmona C,et al.TheDisplacement Field of the Landers EarthquakeMapped by Radar Interferometry[J].Nature,1993,364(8):138-142
[3]Reuter HI,Nelson A,Jarvis A,et al.An Evalua-tion of Void Filling Interpolation Methods forSRTM Data[J].Int J Geogr Inf Sci,2007,21(9):983-1 008
[4]Ge Linlin,Zhang Kui,Alex N,et al.Preli minaryResult of Satellite Radar Differential Interferometryfor the Co-seismic Deformation of the May 2008 Mw7.9 Wenchuan Earthquake[J].Geographic Informa-tion Sciences,2008,14(1):12-19
[5]Hao K X,Si H J,Fuji wara H,et al.CoseismicSurface-ruptures and Crustal Deformations of the2008 Wenchuan Earthquake Mw7.9,China[J].Geophys Res Lett 2009,36
[6]孙建宝,梁芳,沈正康,等.汶川Ms 8.0地震In-SAR形变观测及初步分析[J].地震地质,2008,30(3):789-793
[7]单新建,屈春燕,宋小刚,等.汶川Ms 8.0级地震InSAR同震形变场[J].地球物理学报,2009,52(2):496-504
[8]蒋弥,丁晓利,李志伟,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,2009,29(1):21-26
[9]徐锡伟,闻学泽,叶建青,等.汶川Ms 8.0地震地表破裂带及其发震构造[J].地震地质,2009,30(3):597-629
[10]余涛,毛田,王云冈,等.汶川特大地震前电离层主要参量变化[J].科学通报,2009,54(4):493-499
[11]李志强.对汶川地震宏观震中和极震区的认识[J].地震地质,2008,30(3):768-777
[12]Hanssen R F.Radar Interferometry-Data Interpre-tation and Error Analysis[M].New York:KluwerAcademic Publishers,2001
[13]吴云孙,李振洪,刘经南,等.InSAR观测值大气改正方法的研究进展[J].武汉大学学报.信息科学版,2006,31(10):862-867
[14]国家重大科学工程“中国地壳运动观测网络”项目组.GPS测定的2008年汶川Mw 7.9级地震的同震位移场[J].中国科学(D辑:地球科学),2008,38(10):1 195-1 206
[2]Massonnet D,Rossi M,Carmona C,et al.TheDisplacement Field of the Landers EarthquakeMapped by Radar Interferometry[J].Nature,1993,364(8):138-142
[3]Reuter HI,Nelson A,Jarvis A,et al.An Evalua-tion of Void Filling Interpolation Methods forSRTM Data[J].Int J Geogr Inf Sci,2007,21(9):983-1 008
[4]Ge Linlin,Zhang Kui,Alex N,et al.Preli minaryResult of Satellite Radar Differential Interferometryfor the Co-seismic Deformation of the May 2008 Mw7.9 Wenchuan Earthquake[J].Geographic Informa-tion Sciences,2008,14(1):12-19
[5]Hao K X,Si H J,Fuji wara H,et al.CoseismicSurface-ruptures and Crustal Deformations of the2008 Wenchuan Earthquake Mw7.9,China[J].Geophys Res Lett 2009,36
[6]孙建宝,梁芳,沈正康,等.汶川Ms 8.0地震In-SAR形变观测及初步分析[J].地震地质,2008,30(3):789-793
[7]单新建,屈春燕,宋小刚,等.汶川Ms 8.0级地震InSAR同震形变场[J].地球物理学报,2009,52(2):496-504
[8]蒋弥,丁晓利,李志伟,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,2009,29(1):21-26
[9]徐锡伟,闻学泽,叶建青,等.汶川Ms 8.0地震地表破裂带及其发震构造[J].地震地质,2009,30(3):597-629
[10]余涛,毛田,王云冈,等.汶川特大地震前电离层主要参量变化[J].科学通报,2009,54(4):493-499
[11]李志强.对汶川地震宏观震中和极震区的认识[J].地震地质,2008,30(3):768-777
[12]Hanssen R F.Radar Interferometry-Data Interpre-tation and Error Analysis[M].New York:KluwerAcademic Publishers,2001
[13]吴云孙,李振洪,刘经南,等.InSAR观测值大气改正方法的研究进展[J].武汉大学学报.信息科学版,2006,31(10):862-867
[14]国家重大科学工程“中国地壳运动观测网络”项目组.GPS测定的2008年汶川Mw 7.9级地震的同震位移场[J].中国科学(D辑:地球科学),2008,38(10):1 195-1 206
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心