仲巴2004年Ms6.7和2005年Ms6.5地震的InSAR观测及形变分析
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摘要
利用欧洲Envisat雷达遥感图像,获取了2004年7月12日和2005年4月8日西藏仲巴Ms6.7和Ms6.5地震的InSAR同震形变场。结果显示这两次地震造成震中区20km×20km范围内近EW向升降变形,最大变形分别为19.0cm和30.5cm。根据均匀弹性半空间模型,推断这两次地震是以正断为主的破裂过程,震中位于83.71°E,30.70°N,震级Mw6.1和83.72°E,30.52°N,震级Mw6.2,其最大倾滑量分别为1m和1.4m,两次地震均发生在NW向的雅鲁藏布江断裂带和近NS向的帕龙错-仓木错断裂的交汇部位。
The Envisat images from ESA were used to derive the coseismic deformation interferograms caused by the Zhongba Ms6.7 earthquake on July12,2004 and Ms6.5 earthquake on April 8,2005 occurred in Tibet.The results indicate that two earthquakes caused the deformation in an area of 20 km with a maximum LOS change about 19.0 cm and 30.5 cm recpectively.Adopting isotropic elastic half-space dislocation model,we estimate that the two earthquakes epicenter locate at E83.71°,N30.70° with a seismic moment tensor Mw6.1 and E83.72°,N30.52° with a seismic moment tensor Mw6.2,dominated by normal fault fracture with maximum slip 1 m and 1.4 m,located at the intersection of NW Brahmaputra fault zone and the near side NS Palongcuo-Cangmucuo fault zone.
The Envisat images from ESA were used to derive the coseismic deformation interferograms caused by the Zhongba Ms6.7 earthquake on July12,2004 and Ms6.5 earthquake on April 8,2005 occurred in Tibet.The results indicate that two earthquakes caused the deformation in an area of 20 km with a maximum LOS change about 19.0 cm and 30.5 cm recpectively.Adopting isotropic elastic half-space dislocation model,we estimate that the two earthquakes epicenter locate at E83.71°,N30.70° with a seismic moment tensor Mw6.1 and E83.72°,N30.52° with a seismic moment tensor Mw6.2,dominated by normal fault fracture with maximum slip 1 m and 1.4 m,located at the intersection of NW Brahmaputra fault zone and the near side NS Palongcuo-Cangmucuo fault zone.
引文
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9王华.利用InSAR研究青藏高原地区若干同震与震间形变[D].武汉大学,2007.(Wang Hua.Research on several coseismic and interseismic deformation in Tibetan Plateau by using InSAR[D].Wuhan University,2007)
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15王庆良,等.中国典型强震震后形变有效松弛时间研究[A].中国地震学会第七次学术大会论文摘要集[C].1998,13.(Wang Qingliang,et al.Researchiong on effective relaxation time of postseismic deformation from typical strong earthquake in China[A].Academic conference pa-pers abstract of seventh seismological society[X].1998,13)
16任金卫,王敏.GPS观测的2001年昆仑山口西Ms8.1地震地壳形变[J].第四纪研究,2005,25(1):34-44.(Ren Jinwei ans Wang Min.GPS measured crustal deforma-tion of theMs8.1Kunlun earthquake on novermber14th2001in Qinghai-Tibet plateau[J].Quaterry Science,2005,25(1):34-44)
17谭凯,等.震后形变的解析模型好时空分布特征[J].大地测量与地球动力学,2005,(4):23-26.(Tan Kai,et al.Analitic models and space-time distribution of postseis-mic deformation[J].Journal of Geodesy and Geodynamics,2005,(4):23-26)
18郑斯华.青藏高原地震的震源深度及构造意义[J].中国地震,1995,11(2):99-106.(Zheng Sihua.Focal depth of earthquakes under the Tibetan Plateau and Its tectonic implication[J].Earthquake Research in China,1995,11(2):99-106)
19蒋长胜,吴忠良.由“重复地震”给出的中国地震台网的定位精度估计[J].中国地震,2005,21(2):147-154.(Jiang Changsheng and Wu Zhongliang.Estimating the lo-cation accuracy of the China national seismograph network using repeating events[J].Earthquake Research in China,2005,21(2):147-154)
2谭凯,等.改则Ms6.9地震InSAR同震形变场模拟[J].大地测量与地球动力学,2009,(增刊):1-6.(Tan Kai,et al.Modeling InSAR coseismic deformation field caused by GaizeMs6.9earthquake in2008[J].Journal of Geodesy and Geodynamics,2009,(Supp.):1-6)
3沈强,等.中国玉树Mw6.9地震InSAR地表形变特征分析[J].大地测量与地球动力学,2010,(3):5-9.(Shen Qiang,et al.Characteristic analysis of coseismic deformation of YushuMw6.9earthquake from InSAR images[J].Journal of Geodesy and Geodynamics,2010,(3):5-9)
4张艳梅,等.基于DInSAR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,2008,(3):12-17.(Zhang Yanmei,et al.Seimic deformation detection ofMs8.1earthquake in west to Kunlun mountain pass in2001with DInSAR[J].Journal of Geodesy and Geodynam-ics,2007,(3):12-17)
5邵翠如,等.雅鲁藏布江大峡谷地区构造和地震活动特征[J].震灾防御技术,2008,3(4):398-412.(Shao Cuiru,et al.Tectonic characteristics and seismic activities of yaluzangbu grand canyon,Tibet,China[J].Technology for Earthquake Disaster Prevention,2008,3(4):398-412)
6艾印双,郑天愉.青藏高原地震活动及其构造背景[J].地球物理学进展,1997,12(2):30-40.(Ai Shuangyin and Zheng Tianyu.Seismic activity in Tibetan plateau and its tectonic implication[J].Progress in Geophysics,1997,12(2):30-40)
7文升梁,梁晓莉.西藏仲巴县6.8级地震的启示[J].高原地震,2008,20(3):51-52.(Wen Shengliang and Liang Xiaoli.Revelation of zhongbaMs6.8earthquake in Xizang automomous region[J].Plateau Earthquake Reserch,2008,20(3):51-52)
8Farr T,et al.The shuttle radar topography mission[J].Rev.Geophys,2007,45:RG2005,doi:10.1029/2005RG000172.
9王华.利用InSAR研究青藏高原地区若干同震与震间形变[D].武汉大学,2007.(Wang Hua.Research on several coseismic and interseismic deformation in Tibetan Plateau by using InSAR[D].Wuhan University,2007)
10Chen C and Zebker H.Network approaches to two-dimen-sional phase unwrapping:Intratability and two new algo-rithrns[J].J.Opt.Soc.Am,2000,17:401-414.
11Okada Y.Surface deformation due to shear and tensile faults in a half-space[J].Bull.Seismol Soc Am,1985,75:1135-1154.
12Peltzer G and Rosen P.Surface displacement of the17May1993Eureka Valley,California,Earthquake observed by SAR interferometry[J].Scence,1995,268:1333-1336.
13王瑜,等.西藏南部地区SN向构造的形成及动力学探讨[J].地震地质,2000,22(增刊):117-124.(Wang Yu,et al.Formation and dynamic analysis of NS trending struc-ture in sorthern Tibet[J].Seismological And Geology,2000,22(Supp.):117-124)
14吴章明,等.西藏中部的发震构造[J].中国地震,1994,10(1):19-27.(Wu Zhangming,et al.Seismogenic tec-tonics in the central Tibet[J].Earthquake Research in China,1994,10(1):19-27)
15王庆良,等.中国典型强震震后形变有效松弛时间研究[A].中国地震学会第七次学术大会论文摘要集[C].1998,13.(Wang Qingliang,et al.Researchiong on effective relaxation time of postseismic deformation from typical strong earthquake in China[A].Academic conference pa-pers abstract of seventh seismological society[X].1998,13)
16任金卫,王敏.GPS观测的2001年昆仑山口西Ms8.1地震地壳形变[J].第四纪研究,2005,25(1):34-44.(Ren Jinwei ans Wang Min.GPS measured crustal deforma-tion of theMs8.1Kunlun earthquake on novermber14th2001in Qinghai-Tibet plateau[J].Quaterry Science,2005,25(1):34-44)
17谭凯,等.震后形变的解析模型好时空分布特征[J].大地测量与地球动力学,2005,(4):23-26.(Tan Kai,et al.Analitic models and space-time distribution of postseis-mic deformation[J].Journal of Geodesy and Geodynamics,2005,(4):23-26)
18郑斯华.青藏高原地震的震源深度及构造意义[J].中国地震,1995,11(2):99-106.(Zheng Sihua.Focal depth of earthquakes under the Tibetan Plateau and Its tectonic implication[J].Earthquake Research in China,1995,11(2):99-106)
19蒋长胜,吴忠良.由“重复地震”给出的中国地震台网的定位精度估计[J].中国地震,2005,21(2):147-154.(Jiang Changsheng and Wu Zhongliang.Estimating the lo-cation accuracy of the China national seismograph network using repeating events[J].Earthquake Research in China,2005,21(2):147-154)
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