渭河断裂中东段长水准剖面的非均匀负位错反演
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摘要
利用近年陕西关中东部长水准剖面垂直形变速率资料,借助位错量与倾角分层变化的非均匀负位错模型的构建与反演,推算渭河断裂中东段几何参数,研究其应变能积累动态演化与深浅部差异性,以及与汶川大震能量释放-调整影响的关系。结果表明:1)断裂具铲形特征——地表至浅部陡立,深度与地质资料基本一致;2)应变能积累多表现在上-中层,汶川震前积累程度明显,2008—2009年减弱,可能与大震能量释放有关;2009—2010年积累方式逆转,反映震后一定程度调整影响(可能诱发了高陵4.4级地震);截至2011年调整状态尚未完全结束。
Using vertical deformation data of long-leveling section in recent years at the eastern Guanzhong in Shaanxi province,by the aid of construction and inversion with non-homogeneous negative dislocation model with stratification changes of dislocation and dip angle,the geometry parameters of the middle-eastern segments of Weihe fault are computed.The dynamic evolution of strain energy accumulation and difference between different depths together with the relation to energy release and adjustment influence of the Wenchuan earthquake are studied.The results show as follows: 1)The fault is listric nearly to right angle from earth surface to shallow layer,and the depth is basically consistent with geological data.2) The strain accumulation is mainly located at upper-middle layers,displaying obviously before the Wenchuan earthquake,decreased during 2008-2009 probably related to energy release,with reverse related to adjustment after this earthquake during 2009-2010(possibly promoted the Gaoling 4.4 earthquake);up to 2011,this adjustment situation had not ended completely.
Using vertical deformation data of long-leveling section in recent years at the eastern Guanzhong in Shaanxi province,by the aid of construction and inversion with non-homogeneous negative dislocation model with stratification changes of dislocation and dip angle,the geometry parameters of the middle-eastern segments of Weihe fault are computed.The dynamic evolution of strain energy accumulation and difference between different depths together with the relation to energy release and adjustment influence of the Wenchuan earthquake are studied.The results show as follows: 1)The fault is listric nearly to right angle from earth surface to shallow layer,and the depth is basically consistent with geological data.2) The strain accumulation is mainly located at upper-middle layers,displaying obviously before the Wenchuan earthquake,decreased during 2008-2009 probably related to energy release,with reverse related to adjustment after this earthquake during 2009-2010(possibly promoted the Gaoling 4.4 earthquake);up to 2011,this adjustment situation had not ended completely.
引文
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7张希,崔笃信,蒋锋云.基于GPS观测的汶川地震参数反演与库仑应力变化分析[J].地震研究,2009,32(4):351-356.(Zhang Xi,Cui Duxin and Jiang Fengyun.Inver-sion of seismic parameters of the Wenchuan earthquake andanalysis on variation of its Coulomb stress based on GPS ob-servation[J].J of Seismological Research.,2009,32(4):351-356)
8张希,等.青藏块体东北缘近期GPS水平运动特征与汶川大震影响[J].地震研究,2010,33(4):265-268.(Zhang Xi,et al.Features of current horizontal movementobserved by GPS and influence of the great Wenchuan earth-quake in the Northeastern margin of Qinghai-Tibet block[J].J of Seismological Research,2010,33(4):265-268)
9高好林,等.渭河盆地地形变特征研究[J].大地测量与地球动力学,2009,(3):60-66.(Gao Haolin,et al.Re-search on deformation characteristics of Weihe basin[J].Jof Geodesy and Geodynamics,2009,(3):60-66)
10 Okada Y.Surface deformation due to shear and tensilefaults in a half-space[J].Bulletin of the Seismological So-ciety of America,1985,75(4):1 135-1 154.
11 Matsu’ura M,Jackson D D and Cheng A.Dislocationmodel for aseismic crustal deformation at Hollister,Califor-nia[J].J of Geophysical Research.,1986,91(B12):12 661-12 674.
12张希,张四新,王双绪.昆仑山口西8.1级地震前后地壳垂直运动的负位错模型[J].地震研究,2004,27(2):153-158.(Zhang Xi,Zhang Sixin and Wang Shuangxu.Negative dislocation model for vertical crustal movement be-fore and after Ms8.1 earthquake in the west of Kunlunmountain pass[J].J of Seismological Research.,2004,27(2):153-158)
13张希,等.青藏块体东北缘GPS与水准资料的三维负位错联合反演[J].国际地震动态,2007,378(7):61-66.(Zhang Xi,et al.United inversion of three-dimensionalnegative dislocation for GPS and leveling observation innortheastern margins of Qinghai-Tibet block[J].RecentDevelopments in World Seismology,2007,378(7):61-66)
2邢西淳,等.关中地区近期垂直形变与现今活动特征[J].地震地磁观测与研究,2005,26(增刊):27-35.(Xing Xi-chun,et al.Study on vertical deformation and active charac-teristics of faults in Guangzhong area[J].Seismological andGeomagnetic Observation and Research,2005,26(Supp.):27-35)
3戴王强,等.陕西中部地区跨断层垂直形变与水平应变相关性分析[J].地震,2007,27(1):63-69.(Dai Wan-gqiang,et al.Correlation analysis on vertical deformationcross fault and horizontal strain data in middle Shanxi prov-ince[J].Earthquake,2007,27(1):63-69)
4祝意青,等.关中地区地壳形变综合分析与研究[J].大地测量与地球动力学,2006,(4):56-62.(Zhu Yiqing,etal.Comprehensive analysis and study of crustal deformationin Guanzhong area[J].Journal of Geodesy and Geodynam-ics,2006,(4):56-62)
5瞿伟,等.渭河盆地现今地壳水平运动及应变特征[J].大地测量与地球动力学,2009,(4):34-37.(Ju Wei,et al.Research on horizontal crustal motion and strain features ofWeihe basin with GPS data[J].Journal of Geodesy and Ge-odynamics,2009,(4):34-37)
6张希,等.地形变观测揭示的汶川Ms8.0级地震同震响应与影响[J].武汉大学学报(信息科学版),2009,34(10):1204-1209.(Zhang Xi,et al.Coseismic responseand influence of the Wenchuan Ms8.0 earthquake revealedby crustal deformation observation[J].Geomatics and Infor-mation Science of Wuhan University,2009,34(10):1 204-1 209)
7张希,崔笃信,蒋锋云.基于GPS观测的汶川地震参数反演与库仑应力变化分析[J].地震研究,2009,32(4):351-356.(Zhang Xi,Cui Duxin and Jiang Fengyun.Inver-sion of seismic parameters of the Wenchuan earthquake andanalysis on variation of its Coulomb stress based on GPS ob-servation[J].J of Seismological Research.,2009,32(4):351-356)
8张希,等.青藏块体东北缘近期GPS水平运动特征与汶川大震影响[J].地震研究,2010,33(4):265-268.(Zhang Xi,et al.Features of current horizontal movementobserved by GPS and influence of the great Wenchuan earth-quake in the Northeastern margin of Qinghai-Tibet block[J].J of Seismological Research,2010,33(4):265-268)
9高好林,等.渭河盆地地形变特征研究[J].大地测量与地球动力学,2009,(3):60-66.(Gao Haolin,et al.Re-search on deformation characteristics of Weihe basin[J].Jof Geodesy and Geodynamics,2009,(3):60-66)
10 Okada Y.Surface deformation due to shear and tensilefaults in a half-space[J].Bulletin of the Seismological So-ciety of America,1985,75(4):1 135-1 154.
11 Matsu’ura M,Jackson D D and Cheng A.Dislocationmodel for aseismic crustal deformation at Hollister,Califor-nia[J].J of Geophysical Research.,1986,91(B12):12 661-12 674.
12张希,张四新,王双绪.昆仑山口西8.1级地震前后地壳垂直运动的负位错模型[J].地震研究,2004,27(2):153-158.(Zhang Xi,Zhang Sixin and Wang Shuangxu.Negative dislocation model for vertical crustal movement be-fore and after Ms8.1 earthquake in the west of Kunlunmountain pass[J].J of Seismological Research.,2004,27(2):153-158)
13张希,等.青藏块体东北缘GPS与水准资料的三维负位错联合反演[J].国际地震动态,2007,378(7):61-66.(Zhang Xi,et al.United inversion of three-dimensionalnegative dislocation for GPS and leveling observation innortheastern margins of Qinghai-Tibet block[J].RecentDevelopments in World Seismology,2007,378(7):61-66)
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