新疆于田Mw7.2地震3D同震形变场解算与分析
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摘要
基于OKADA弹性半空间模型和差分干涉测量获取的升、降轨两种不同视角的同震形变场,分析了于田地震三维同震形变场特征。结果表明:在垂直方向上,断层西盘沉降,最大沉降形变量达-109.7 cm,东盘隆升,最大隆升形变量为19.2 cm;在东西方向上,断层西盘以朝西运动为主,最大形变量达-51.4 cm,东盘朝东运动,最大形变量达98.5 cm;在南北方向上,断裂西盘以朝南运动为主,最大形变量达-66.5 cm,断裂东盘朝北运动,最大形变量为25.8 cm;合成后的水平向形变表明,断层具有西盘朝南走滑、东盘朝北走滑的形变特征,揭示出于田地震断层为正断兼左旋走滑的破裂机制。
On the basis of the elastic half-space model of OKADA,and under the constraint of interferograms,We obtained the parameters of three sub-faults and simulative three-dimensional(3D) deformation field of the Yutian Mw7.2 earthquake,Xinjiang.Furthermore,combining the simulative North direction deformation field with the interferograms of ascending and descending oribt,we calculated out the deformation fields in vertical and east direction.At last,we analyzed the characteristics of 3D co-seismic deformation field of the Yutian earthquake.The analysis shows that in the vertical direction,the west wall of the fault subside with maximal value about-109.7 cm,but the east wall uplifted with maximum value about 19.2 cm,and the dominant subsiding deformation feature indicates the mostly normal rupture feature of the earthquake;in the east-west direction,the west wall majorly moved west wards with maximal value about-51.4 cm,but the east wall majorly moved east wards with maximal value about 98.5 cm;in the north-south direction,the west wall majorly moved south wards with maximal value about-66.5 cm,but the east wall majorly moved north wards with maximal value about 25.8 cm.The synthetic horizontal deformation field indicates that the west wall of the fault striked slip south wards,but east wall north wards.These characteristics reveal that the fault of Yutian Mw6.2 earthquake appeared with some sinistral strike-slip with the obvious normal.
On the basis of the elastic half-space model of OKADA,and under the constraint of interferograms,We obtained the parameters of three sub-faults and simulative three-dimensional(3D) deformation field of the Yutian Mw7.2 earthquake,Xinjiang.Furthermore,combining the simulative North direction deformation field with the interferograms of ascending and descending oribt,we calculated out the deformation fields in vertical and east direction.At last,we analyzed the characteristics of 3D co-seismic deformation field of the Yutian earthquake.The analysis shows that in the vertical direction,the west wall of the fault subside with maximal value about-109.7 cm,but the east wall uplifted with maximum value about 19.2 cm,and the dominant subsiding deformation feature indicates the mostly normal rupture feature of the earthquake;in the east-west direction,the west wall majorly moved west wards with maximal value about-51.4 cm,but the east wall majorly moved east wards with maximal value about 98.5 cm;in the north-south direction,the west wall majorly moved south wards with maximal value about-66.5 cm,but the east wall majorly moved north wards with maximal value about 25.8 cm.The synthetic horizontal deformation field indicates that the west wall of the fault striked slip south wards,but east wall north wards.These characteristics reveal that the fault of Yutian Mw6.2 earthquake appeared with some sinistral strike-slip with the obvious normal.
引文
1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,2008,31(4):543-549.(Yin Guanghua,Jiang Jingxiang and Wu Guodong.Tectonic background of the M7.4 earthquake at Yutian onMarch 21,2008[J].Arid Land Geography,2008,31(4):543-549)
2李志海,马宏生,曲延军.2008年3月21日新疆于田7.3级地震发震构造与震前地震活动特征研究[J].中国地震,2009,25(2):199-205.(Li Zhihai,Ma Hongsheng andQu Yanjun.Study on seismogenic structure and seismic ac-tivity characteristics before the Yutian M7.3 earthquake onMarch 21,2008,Xinjiang[J].Earthquake Research in Chi-na,25(2):199-205)
3刘智荣,等.基于梯度下降法反演于田Mw7.1地震同震滑动分布[J].大地测量与地球动力学,2012,(6):8-12.(Liu Zhirong,et al.Coseismic slip dirtrubution of YutianMw7.1 earthguake based on steepest descent method[J].Journal of Geodesy and Geodynamics,2012,(6):8-12)
4蒋廷臣,等.基于宽幅SAR干涉测量的新疆于田7.3级地震形变分析[J].大地测量与地球动力学,2012,(6):13-16.(Jiang Tingchen,et al.Deformation analysis of Yu-tian earthquake based on ScanSAR interferometry[J].Jour-nal of Geodesy and Geodynamics,2012,(6):13-16)
5申重阳,等.2008年于田Ms7.3地震前重力场动态变化特征分析[J].大地测量与地球动力学,2010,(4):1-7.(Shen Chongyang,et al.Characteristic analysis of dynamicgravity change before Yutian Ms7.3 earthquake,2008[J].Journal of Geodesy and Geodynamics,2010,(4):1-7)
6王凡,等.利用GPS观测资料分析2008年于田Ms7.3地震的同震位移及震后形变[J].地球物理学报,2011,54(9):2250-2255,DOI:10.3969/j.issn.0001-5733.2011.09.007.(Wang Fan,et al.Coseismic and postseismicdeformation of M7.3 Yutian earthquake derived from GPSdata[J].Chinese J Geophys.,2011,54(9):2250-2255,,DOI:10.3969/j.issn.0001-5733.2011.09.007)
7徐锡伟,等.2008年于田Ms7.3地震地表破裂带特征及其构造属性讨论[J].地震地质,2011,33(2):462-471.(Xu Xiwei,et al.Surface rupture features of the 2008Yutian Ms7.3 earthquake and its tectonic nature[J].Seis-mology and Geology,2011,33(2):462-471)
8汪驰升,等.基于ASAR升降轨数据解算于田Ms7.3地震3D同震形变场[J].地震,2009,(29):105-112.(Wang Chisheng,et al.3D coseismic deformation field ofthe Yutian Ms7.3 earthquake calculated from ASAR ascend-ing and descending data[J].Earthquake,2009,(29):105-112)
9 Okada.Surface deformation due to shear and tensile faults ina half-space[J].Bulletin of the Seismological Society of A-merica,1985,75(4):1135-1154.
10 Elliott J R.Strain accumulation&release on the TibetanPlateau measured using InSAR[D].University of Oxford,Department of Earth Sciences,2009.
11 Kurl L Feigl and Emmeline Dupré.RNGCHN:a programto calculate displacement components from dislocations in anelastic half-space with applications for modeling geodeticmeasurements of crustal deformation[J].Computers and Ge-osciences,1998,(6):95-116.
12 K Abe.Moments and magnitudes of earthquakes[A].In:Ahrens J(Ed).Global Earthquake earth Physics:A hand-book of physical Conatanta[C].1995,(1):206-213,Americal geophysical Union.Washington.DC.
13 Kanamori H.The energy release in great earthquake[J].Geophys Res.,1997,82:2981-2987.
2李志海,马宏生,曲延军.2008年3月21日新疆于田7.3级地震发震构造与震前地震活动特征研究[J].中国地震,2009,25(2):199-205.(Li Zhihai,Ma Hongsheng andQu Yanjun.Study on seismogenic structure and seismic ac-tivity characteristics before the Yutian M7.3 earthquake onMarch 21,2008,Xinjiang[J].Earthquake Research in Chi-na,25(2):199-205)
3刘智荣,等.基于梯度下降法反演于田Mw7.1地震同震滑动分布[J].大地测量与地球动力学,2012,(6):8-12.(Liu Zhirong,et al.Coseismic slip dirtrubution of YutianMw7.1 earthguake based on steepest descent method[J].Journal of Geodesy and Geodynamics,2012,(6):8-12)
4蒋廷臣,等.基于宽幅SAR干涉测量的新疆于田7.3级地震形变分析[J].大地测量与地球动力学,2012,(6):13-16.(Jiang Tingchen,et al.Deformation analysis of Yu-tian earthquake based on ScanSAR interferometry[J].Jour-nal of Geodesy and Geodynamics,2012,(6):13-16)
5申重阳,等.2008年于田Ms7.3地震前重力场动态变化特征分析[J].大地测量与地球动力学,2010,(4):1-7.(Shen Chongyang,et al.Characteristic analysis of dynamicgravity change before Yutian Ms7.3 earthquake,2008[J].Journal of Geodesy and Geodynamics,2010,(4):1-7)
6王凡,等.利用GPS观测资料分析2008年于田Ms7.3地震的同震位移及震后形变[J].地球物理学报,2011,54(9):2250-2255,DOI:10.3969/j.issn.0001-5733.2011.09.007.(Wang Fan,et al.Coseismic and postseismicdeformation of M7.3 Yutian earthquake derived from GPSdata[J].Chinese J Geophys.,2011,54(9):2250-2255,,DOI:10.3969/j.issn.0001-5733.2011.09.007)
7徐锡伟,等.2008年于田Ms7.3地震地表破裂带特征及其构造属性讨论[J].地震地质,2011,33(2):462-471.(Xu Xiwei,et al.Surface rupture features of the 2008Yutian Ms7.3 earthquake and its tectonic nature[J].Seis-mology and Geology,2011,33(2):462-471)
8汪驰升,等.基于ASAR升降轨数据解算于田Ms7.3地震3D同震形变场[J].地震,2009,(29):105-112.(Wang Chisheng,et al.3D coseismic deformation field ofthe Yutian Ms7.3 earthquake calculated from ASAR ascend-ing and descending data[J].Earthquake,2009,(29):105-112)
9 Okada.Surface deformation due to shear and tensile faults ina half-space[J].Bulletin of the Seismological Society of A-merica,1985,75(4):1135-1154.
10 Elliott J R.Strain accumulation&release on the TibetanPlateau measured using InSAR[D].University of Oxford,Department of Earth Sciences,2009.
11 Kurl L Feigl and Emmeline Dupré.RNGCHN:a programto calculate displacement components from dislocations in anelastic half-space with applications for modeling geodeticmeasurements of crustal deformation[J].Computers and Ge-osciences,1998,(6):95-116.
12 K Abe.Moments and magnitudes of earthquakes[A].In:Ahrens J(Ed).Global Earthquake earth Physics:A hand-book of physical Conatanta[C].1995,(1):206-213,Americal geophysical Union.Washington.DC.
13 Kanamori H.The energy release in great earthquake[J].Geophys Res.,1997,82:2981-2987.
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