基于升降轨ASAR的于田Ms 7.3级地震同震形变场信息提取与分析
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摘要
升降轨干涉测量可以更好地反映地震同震形变场特征。利用欧空局ASAR数据通过二轨法差分干涉测量提取了新疆于田县Ms 7.3级地震升降轨同震形变场信息。结果显示:升轨同震形变场最大视线向(LOS)隆升形变量约+13.3 cm,沉降形变量约-83.9 cm;降轨同震形变场最大LOS向隆升形变量约+36.5 cm,沉降形变量约-66.5 cm。于田地震以NNE向正断层破裂为主,并伴随左旋走滑运动,西北盘为正断层破裂的上盘(沉降盘),东南盘为正断层破裂的下盘(隆升盘)。升降轨同震形变场存在一定差异,但其变化趋势与特征非常相似,其差异主要是由于两种不同观测模式所造成的。
The Differential Interferometric Synthetic Aperture Radar(D-InSAR) based on the ascending and descending orbit data can better reveal the feature of coseismic deformation fields.With the ASAR data from European Space Agency(ESA) and two-pass D-InSAR measurement,this paper obtained both ascending orbit and descending orbit coseismic deformation fields of Yutian Ms7.3 Earthquake.The results show that the max LOS uplifting value is about +13.3 cm and the subsiding value is about-82.0 cm in the ascending-orbit coseismic deformation field,and the max LOS uplifting value is about +36.5 cm and the subsiding value is about-66.5 cm in the descending-orbit coseismic deformation field.The Yutian Earthquake is mainly rupturing along the NNE-trending normal fault with a little left-striking,the northwest plate is the hanging-wall(subsiding) of the normal fault,and the southeast plate is the footwall(uplifting) of the normal fault.The coseismic deformation fields of ascending and descending orbits are different from each other in some aspects,but their variable tendencies and characteristics are similar,and the difference is mainly due to the two different observation modes.
The Differential Interferometric Synthetic Aperture Radar(D-InSAR) based on the ascending and descending orbit data can better reveal the feature of coseismic deformation fields.With the ASAR data from European Space Agency(ESA) and two-pass D-InSAR measurement,this paper obtained both ascending orbit and descending orbit coseismic deformation fields of Yutian Ms7.3 Earthquake.The results show that the max LOS uplifting value is about +13.3 cm and the subsiding value is about-82.0 cm in the ascending-orbit coseismic deformation field,and the max LOS uplifting value is about +36.5 cm and the subsiding value is about-66.5 cm in the descending-orbit coseismic deformation field.The Yutian Earthquake is mainly rupturing along the NNE-trending normal fault with a little left-striking,the northwest plate is the hanging-wall(subsiding) of the normal fault,and the southeast plate is the footwall(uplifting) of the normal fault.The coseismic deformation fields of ascending and descending orbits are different from each other in some aspects,but their variable tendencies and characteristics are similar,and the difference is mainly due to the two different observation modes.
引文
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[2]Peltzer G,Frederic Crampe,Gsofmy King.Evidence of NonlinearElasticity of the Crust from the Mw 7.6 Manyi(Tibet)Earthquake[J].Science,1999,286:272-276.
[3]单新建,马瑾,王长林,等.利用星载D-InSAR技术获取的地表形变场提取玛尼地震震源断层参数[J].中国科学,20023,2(10):837-844.
[4]Ryder I,Parsons B,Wright T Je,t al.Post-seismic Motion Fol-lowing the 1997 Manyi(Tibet)Earthquake:InSAR Observationsand Modelling[J].Geophysical Journal International,2007,169:1009-1027.
[5]Lin A M,Fu B H,Gun J M,et al.Co-seismic Strike-slip andRupture Length Produced by the 2001 Ms 8.1 Central KunlunEarthquake[J].Science,2002,296:2015-2017.
[6]王超,刘智,张红,等.张北—尚义地震同震形变场雷达差分干涉测量[J].科学通报,2000,45(23):2550-2554.
[7]Pathier E,Frnneau B,et al.Coseismic Displacements of the Foot-wall of the Chelungpu Fault Caused by the 1999,Taiwan,Chi-Chi Earthquake from InSAR and GPS Data[J].Earth Planet Sci-cence Letters,2003,212:73-88.
[8]刘国祥,丁晓利,李志伟,等.ERS卫星雷达干涉测量:1999年台湾集集大地震震前和同震地表位移[J].地球物理学报,2002,45(增刊):165-174.
[9]洪顺英,刘智荣,戴娅琼,等.西藏改则地震升降轨同震形变场特征分析与破裂模式[J].国土资源遥感2,010(1):44-48.
[10]尹光华,蒋靖祥,吴国栋.2008年3月21日于田7.4级地震的构造背景[J].干旱区地理2,008,31(4):543-549.
[11]陈学忠,蒋长胜,李燕娥.2008年3月21日新疆于田7.3级地震[J].国际地震动态,2008(4):18-28.
[12]Rodriguez E,Morris C S,Belz J E,et al.An Assessment of theSRTM Topographic Products[R].JPL D-31639,Jet PropulsionLaboratory,Pasadena,California,2005:143.
[13]LI Zhiwei.Modeling Atmospheric Effects on Repeat-pass InSARMeasurements[D].Hong Kong:Department of Land Surveying andGeo-Informatics,the Hong Kong Polytechnic University2,004.
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