融合升降轨SAR干涉相位和幅度信息揭示地表三维形变场的研究
摘要
针对InSAR技术只能监测地表在雷达视线方向上的形变的缺点,详细介绍了融合升降轨SAR干涉相位和幅度信息监测地表三维形变的具体方法.该方法主要分为3个步骤:(1)利用升降轨SAR干涉相位监测地表在2个不同雷达视线方向上的形变;(2)利用升降轨SAR幅度信息获取地表在2个不同方位向上的形变;(3)采用最小二乘准则和Helmert方差分量估计融合上述4个不同方向的形变,从而估计地表三维形变场.以2003年伊朗Bam地震为例,应用该方法成功地揭示了该地震引起的地表三维形变场,结果显示Bam地区北部出现了明显地表下沉和沿近西南方向的水平运动,而南部则出现地表隆起和沿近东南方向的水平运动.上下、南北和东西3个方向上的地表形变场都很好地吻合了地震断层所在的位置,最大形变量分别达22,40和30cm.最后,将此三维形变场与利用Okada模型模拟的三维形变场进行了比较,证明了该方法能够得到可靠且精度较高的地表三维形变场.
引文
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2Ding X L,Liu G X,Li Z W,et al.Ground subsidence monitoring in Hong Kong with satellite SAR interferometry.Photogramm Eng Remote Sens,2004,70:1151—1156
3Wright T J,Parsons B E,Lu Z.Toward mapping surface deformation in three dimensions using InSAR.Geophys Res Lett,2004,31:L01607
4Gudmundsson S,Sigmundsson F.Three-dimensional surface motion maps estimated from combined interferometric synthetic aperture radar and GPS data.J Geophys Res,2002,107:1—14
5Fialko Y,Simons M,Agnew D.The complete(3-D)surface displacement field in the epicentral area of the1999MW7.1Hector Mine Earthquake,California,from space geodetic observations.Geophys Res Lett,2001,28:3063—3066
6孙建宝,梁芳,徐锡伟,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.遥感学报,2006,10:489—496
7Michel R,Avouac J.Measuring near field coseismic displacements from SAR images:Application to the Landers earthquake.Geophys Res Lett,1999,26:3017—3020
8Perski Z,Hanssen R.The interperetation of Bam fault kinematics using ENVISAT SAR interferometric data.Fringe2005Workshop,Frascati,Italy,2005.1—6
9Fialko Y,Sandwell D,Simons M,et al.Three-dimensional deformation caused by the Bam,Iran,earthquake and the origin of shallow slip deficit.Nature,2005,435:295—299
10Funning G J,Parsons B,Wright T J,et al.Surface displacements and source parameters of the2003Bam Iran)earthquake from Envisat advanced synthetic aperture radar imagery.J Geophys Res,2005,110:B09406
11Okada Y.Surface deformation due to shear and tensile faults in a half-space.Bull Seismol Soc Amer,1985,75:1135—1154
12European Space Agency.ASAR Product Handbook Version2.2,2007
13Scharoo R,Visser P.Precise orbit determination and gravity field improvement for the ERS satellites.J Geophys Res,1998,103:8113—8127
14Li Z W,Ding X L,Huang C,et al.Filtering method for radar interferogram with strong noise.Int J Remote Sens,2006,27:2991—3000
15Goldstein R M,Zebker H A,Werner C L.Satellite radar interferometry:Two-dimensional phase unwrapping.Radio Sci,1998,23:713—720
16Nolan M,Fatland D R.New DEMs may stimulate significant advancements in remote sensing of soil moisture.Eos Trans AGU,2003,84:233
17Smith B,Sandwell D.Accuracy and resolution of shuttle radar topography mission data.Geophys Res Lett,2003,30:1467—1470
18Talebian M,Fielding E J,Funning G J,et al.The2003Bam(Iran)earthquake:Rupture of a blind strike-slip fault.Geophys Res Lett,2004,31:L11611
19Fielding E J,Talebian M,Rosen P A,et al.Surface ruptures and building damage of the2003Bam,Iran,earthquake mapped by satellite synthetic aperture radar interferometric correlation.J Geophys Res,2005,110:B03302
20Werner C,Wegmuller U,Strozzi T,et al.Precision estimation of local offsets between pairs of SAR SLCs and detected SAR images.International Geoscience and Remote Sensing Symposium,Seoul,Korea,2005.4803—4805
21夏耶.巴姆地震地表形变的差分雷达干涉测量.地震学报,2005,27:423—430
22Wang H,Ge L L,Xu C J,et al.3-D coseimic displacement field of the2005kashmir earthquake inferred from satellite radar imagery.Earth Planets Space,2007,59:343—349
23崔希璋,於宗俦,陶本藻,等.广义测量平差.第2版.北京:测绘出版社,1992
24Nakamura T,Suzuki S,Sadeghi H,et al.Source fault structure of the2003Bam earthquake,southeastern Iran,inferred from the aftershock distribution and its relation to the heavily damaged area:Existence of the Arg-e-Bam fault proposed.Geophys Res Lett,2005,32:L09308
25Wang R,Xia Y,Grosser H,et al.The2003Bam(SE Iran)earthquake:Precise source parameters from satellite radar interferometry.Geophys J Int,2004,159:917—922
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