利用D-InSAR和AZO技术获取Bam地震同震三维形变场
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摘要
基于升降轨道EnvisatASAR影像,利用两轨法D-InSAR技术获取了2003年12月26日伊朗巴姆Mw6.5地震的同震雷达视线向形变场,同时利用方位向像素偏移技术获取了降轨的同震方位向偏移量,然后计算得到了同震三维形变场。结果表明,发震断层以南北向右旋走滑为主,兼有东西向的块体水平旋转运动。两种作用致使东南象限块体受挤压作用而抬升,东北象限块体则受拉张作用下沉。震中地表没有发生剧烈变形。
The coseismic deformation field of the Bam earthquake(Mw 6.5)in LOS(line of sight)is obtained with two pass D-InSAR technique based on ascending and descending pass Envisat ASAR images.Meanwhile,the azimuthal displacement is obeained with AZO(azimuthal pixel offsets)technique.Futhermore,the coseismic 3D deformation field is resulted from the deformation field in LOS and the azimuthal displacement.The results indicate that the seismogenic fault is a right-lateral strike-slip fault with a little effect of block rotation in eastwest direction.The southeastern quadrant block uplifts under the extrusion stress,and the northeastern quadrant block subsides under the tension stress.There is no dramatic deformation on surface that has a less extent rupture.
The coseismic deformation field of the Bam earthquake(Mw 6.5)in LOS(line of sight)is obtained with two pass D-InSAR technique based on ascending and descending pass Envisat ASAR images.Meanwhile,the azimuthal displacement is obeained with AZO(azimuthal pixel offsets)technique.Futhermore,the coseismic 3D deformation field is resulted from the deformation field in LOS and the azimuthal displacement.The results indicate that the seismogenic fault is a right-lateral strike-slip fault with a little effect of block rotation in eastwest direction.The southeastern quadrant block uplifts under the extrusion stress,and the northeastern quadrant block subsides under the tension stress.There is no dramatic deformation on surface that has a less extent rupture.
引文
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13孙建宝,等.升降轨道ASAR雷达干涉揭示的巴姆地震(Mw6.5)3D同震形变场[J].遥感学报,2006,10(4):489-496.
14凌勇,等.巴姆地震变形场和应力场:Ⅰ.用差分干涉雷达和Okada方法求解[J].岩石学报,2002,22(9):2 367-2 374.
15 Talebian M,et al.The 2003 Bam(Iran)earthquake:Ruptureof a blind strike-slip fault[J].Geophysical Research Let-ters,2004,31:L11611,doi:10.1029/2004GL020058,2004.
16 Wang R,et al.The 2003 Bam(SE Iran)earthquake:precisesource parameters from satellite radar interferometry[J].Geophys J Int.,2004,159:917-922.
18李毅,等.用D-InSAR研究巴姆地震形变场[J].大地测量与地球动力学,2008,28(1):32-35.
19 Peyret M,et al.The source motion of 2003 Bam(Iran)earthquake constrained by satellite and ground-based geo-detic data[J].Geophys.J.Int.,2008,3(169):849?865,doi:10.1111/j.1365-246X.2007.03358.x.
2 Zerker H A,et al.On the derivation of coseismic displace-ment fields using Differential Radar Interferometry,the Lan-ders earthquake[J].J.Geophys.Res.,1994,99(B10):19 617-19 634.
3乔学军,郭利民.新疆伽师强震群区的InSAR观测研究[J].大地测量与地球动力学,2007,27(1):7-13.
4张艳梅,等.基于D-InSAR的2001年昆仑山口西8.1级大地震形变探测[J].大地测量与地球动力学,2007,27(3):12-17.
5 Massonnet D,Briole P and Arnaud A.Deflation of Mount Et-na monitored by spaceborne radar interferometry[J].Nature,1995,375:567-570.
6路旭,等.用INSAR作地面沉降监测的试验研究[J].大地测量与地球动力学,2002,22(4):66-70.
7夏耶.巴姆地震地表形变的差分雷达干涉测量[J].地震学报,2005,27(4):423-430.
8查显杰,傅容珊,戴志阳.D-InSAR技术对不同方位形变的敏感性研究[J].测绘学报,2006,35(2):133-137.
9 Rmi Michel and Jean-Philippe Avouac.Measuring grounddisplacement from SAR amplitude images application to thelanders earthquake[J].Geophys.Res.Lett.,1999,26(7):875-878.
10 Fialko Y and Simons M.The complete(3-D)surface dis-placement field in the epicentral area of the 1999Mw7.1Hector Mine earthquake,California,from space geodetic ob-servations[J].Geophys.Res.Lett,2001,28(16):3 063-3066.
11 Fialko Y,et al.Three-dimensional deformation caused bythe Bam,Iran,earthquake and the origin of shallowslip def-icit[J].Nature,2005,435(19):doi:10.1038.
12查显杰,等.基于D-InSAR技术获取形变位移三分量的新方法[J].遥感信息,2008,1(95):4-8.
13孙建宝,等.升降轨道ASAR雷达干涉揭示的巴姆地震(Mw6.5)3D同震形变场[J].遥感学报,2006,10(4):489-496.
14凌勇,等.巴姆地震变形场和应力场:Ⅰ.用差分干涉雷达和Okada方法求解[J].岩石学报,2002,22(9):2 367-2 374.
15 Talebian M,et al.The 2003 Bam(Iran)earthquake:Ruptureof a blind strike-slip fault[J].Geophysical Research Let-ters,2004,31:L11611,doi:10.1029/2004GL020058,2004.
16 Wang R,et al.The 2003 Bam(SE Iran)earthquake:precisesource parameters from satellite radar interferometry[J].Geophys J Int.,2004,159:917-922.
18李毅,等.用D-InSAR研究巴姆地震形变场[J].大地测量与地球动力学,2008,28(1):32-35.
19 Peyret M,et al.The source motion of 2003 Bam(Iran)earthquake constrained by satellite and ground-based geo-detic data[J].Geophys.J.Int.,2008,3(169):849?865,doi:10.1111/j.1365-246X.2007.03358.x.
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