利用D-InSAR技术研究西藏改则地震同震形变场
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摘要
针对2008年1月9日MW6.4西藏改则地震和2008年1月16日的MW5.9余震,通过两通(2-pass)加外部DEM差分干涉处理技术(D-InSAR),提取了地震区域2次地震累积的视线向(LOS)同震形变场。结果表明:发震断层均为正断层,位于依布茶卡-日干配错断裂端点附近。主震发震断层走向为N30°E,余震发震断层走向为N21°E,两断层距离约7km;在影像上主震发震断层有造成地表破裂的痕迹,余震未见地表破裂的痕迹;这次地震造成的同震形变场长约30km,宽约20km,主震断层上盘和下盘视线向最大形变量分别为39.2cm和11.2cm,两盘相对位错达50.4cm,余震造成的视线向形变量为9.4cm。
There are two earthquakes in Gaize on Jan 9(MS 6.9)and Jan 16,2008(MS 6.0).The two earthquakes were selected as examples to obtain the co-seismic deformation field with the 2-pass differential interferometric processing method.The results show that the earthquake faults locate near the tip of the Yibuchaka-Riganpeicuo Fault,and both seismic faults are normal faults;The seismogenic fault of the main shock strikes about N30°E and that of the aftershock strikes about N21°E;There is evidence of surface rupture along the mainshock's causative fault,but no surface rupture has been observed on the aftershock fault;The co-seismic deformation field is about 30km in length and 20km in width;The maximum displacement in LOS of the hanging wall of the main-shock fault is 39.2cm,and that of footwall is 11.2cm,the relative dislocation between them is 50.4cm;The displacement caused by the aftershock is 9.4cm(LOS).
There are two earthquakes in Gaize on Jan 9(MS 6.9)and Jan 16,2008(MS 6.0).The two earthquakes were selected as examples to obtain the co-seismic deformation field with the 2-pass differential interferometric processing method.The results show that the earthquake faults locate near the tip of the Yibuchaka-Riganpeicuo Fault,and both seismic faults are normal faults;The seismogenic fault of the main shock strikes about N30°E and that of the aftershock strikes about N21°E;There is evidence of surface rupture along the mainshock's causative fault,but no surface rupture has been observed on the aftershock fault;The co-seismic deformation field is about 30km in length and 20km in width;The maximum displacement in LOS of the hanging wall of the main-shock fault is 39.2cm,and that of footwall is 11.2cm,the relative dislocation between them is 50.4cm;The displacement caused by the aftershock is 9.4cm(LOS).
引文
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马超,单新建.2006.昆仑山MS8.1地震震源参数的多破裂段模拟研究[J].地球物理学报,49(2):428—437.MA Chao,SHANXin-jian.2006.Amulti-segment analytic modeling of hypocentral geometric characteristic parametersof theMS8.1earthquake at the Kunlun Mountains[J].Chinese Journal of Geophysics,49(2):428—437(inChinese).
单新建,马瑾,王长林,等.2002.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(D辑),32(10):837—844.SHAN Xin-jian,MA Jin,WANG Chang-lin,et al.2002.Co-seismic ground deformation and source parameters of ManiM7.9earthquake inferred from spaceborne D-InSAR observation data[J].Science in China(Ser D),47(6):481—488.
单新建,柳稼航,马超.2004.2001年昆仑山口西MS8.1级地震同震形变场特征的初步分析[J].地震学报,26(5):474—480.SHAN Xin-jian,LIUJia-hang,MAChao.2004.Preliminary analysis on characteristics of coseismic deformation associ-ated withMS=8.1western Kunlunshan Pass earthquake in2001[J].Acta Seismologica Sinica,17(5):526—533.
孙建宝,徐锡伟,沈正康,等.2007.基于线弹性位错模型及干涉雷达同震形变场反演1997年玛尼MW7.5级地震参数-Ⅰ:均匀滑动反演[J].地球物理学报,50(4):1097—1110.SUN Jian-bao,XU Xi-wei,SHEN Zheng-kang,et al.2007.Parameter inversion of the1997Mani earthquake from In-SAR co-seismic deformation field based on linear elastic dislocation model-1:Uniform slip inversion[J].Chi-nese Journal of Geophysics,50(4):1097—1110(in Chinese).
夏耶.2005.巴姆地震地表形变的差分雷达干涉测量[J].地震学报,27(4):423—430.XIA Ye.2005.Bam earthquake:Surface deformation measurement using radar interferometry[J].Acta SeismologicaSinica,18(4):451—459.
张景发,刘钊.2002.InSAR技术在西藏玛尼强震区的应用[J].清华大学学报(自然科学版),42(6):847—850.ZHAGN Jing-fa,LIUZhao.2002.Application of InSAR technology to the strong earthquake in Mani,Tibet[J].Jour-nal of Tsinghua University(Science and Technology),42(6):847—850(in Chinese).
GAN W J,Zhang P Z,Shen Z K,et al.2007.Present-day crustal motion within the Tibetan Plateau inferred from GPSmeasurements[J].J Geophys Res,112,B08416.DOI:10.1029/2005JB004120.
Lasserre C,Peltzer G,Klinger Y,et al.2005.Co-seismic deformation of theMW7.8Kokoxili earthquake in Tibet meas-ured by synthetic aperture radar interferometry[J].J Geophys Res,110,B12408.DOI:10.1029/2004JB003500.
Peltzer G,Crampe F,King G,et al.1999.Evidence of nonlinear elasticity of the crust fromMW7.6Manyi(Tibet)earth-quake[J].Science,286:273—276.
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