汶川Ms8.0地震前后鲜水河断裂南段的变形特征
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摘要
对鲜水河断裂南段康定和石棉两个剖面的GPS观测结果的研究表明:离断层较近的站点,由汶川地震前的左旋走滑变为震后的右旋走滑、震前的挤压变为震后拉张;不管是右旋走滑量、拉张量,还是影响范围,汶川地震对石棉剖面的影响明显大于对康定剖面的影响;由于鲜水河断裂南段具有左旋走滑背景,汶川地震的发生在一定程度上缓解了鲜水河断裂南段的地震危险性。
The GPS observation results showed that an obvious change took place in two southern profiles of Xianshuihe fault after the Wenchuan Ms8.0 earthquake.Movements of sites close to the fault were of from pre-seismic left-lateral strike-slip to post-seismic dextral strike-slip,from pre-seismic compression to post-seismic tensile.The impact of the Wenchuan earthquake on profile Shimian is bigger than that on profile Kangding in dextral strike-slip,tensile and scope.The impact of the Wenchuan earthquake wasn't obvious on sites farther away from the fault.The seismic hazard of southern segment of Xianshuihe fault might declined in a certain extent with the Wenchuan earthquake,because of background of left-lateral strike-slip.
The GPS observation results showed that an obvious change took place in two southern profiles of Xianshuihe fault after the Wenchuan Ms8.0 earthquake.Movements of sites close to the fault were of from pre-seismic left-lateral strike-slip to post-seismic dextral strike-slip,from pre-seismic compression to post-seismic tensile.The impact of the Wenchuan earthquake on profile Shimian is bigger than that on profile Kangding in dextral strike-slip,tensile and scope.The impact of the Wenchuan earthquake wasn't obvious on sites farther away from the fault.The seismic hazard of southern segment of Xianshuihe fault might declined in a certain extent with the Wenchuan earthquake,because of background of left-lateral strike-slip.
引文
①张培震,等.“主要活动地块划分的说明”(课题内部交流使用资料)
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4焦青,等.汶川8.0级地震前后龙门山断裂带活动特征浅析[J].大地测量与地球动力学,2008,(4):7-11.(JiaoQing,et al.Preliminary study on motion characteristics ofLongmenshan fault before and afterMs8.0 Wenchuan earth-quake[J].Journal of Geodesy and Geodynamics,2008,(4):7-11)
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7李延兴,等.汶川8.0地震孕育发生的机制与动力学问题[J].地球物理学报,2009,52(2):519-530.(Li Yanxing,et al.The mechanism and dynamics of the generation and oc-currence for Wenchuan Ms8.0 earthquake[J].Chinese J.Geophys.,2009,52(2):519-530)
8申重阳,李辉,谈洪波.汶川8.0级地震同震重力与形变效应模拟[J].大地测量与地球动力学,2008,(5):6-12.(Shen Zhongyang,Li Hui and Tan Hongbo.Simulation ofcoseismic gravity changes and deformation effect of Wen-chuanMs8.0 earthquake[J].Journal of Geodesy and Geody-namics,2008,(5):6-12)
9“中国地壳运动观测网络”项目组.GPS测定的2008年汶川Ms8.0地震的同震位移场[J].中国科学(D辑),2008,38(10):1 195-1 206.(The Project of Crustal Move-ment Observation Network of China.The coseismic displace-ment fields of WenchuanMs8.0 earthquake occurrence in2008 using GPS data[J].Science in China(Ser D),2008,38(10):1 195-1 206)
10江在森,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009,52(2):505-518.(Jiang Zaisen,et al.The dynamic process of regional crustalmovement and deformation before WenchuanMs8.0 earth-quake[J].Chinese J.Geophys.,2009,52(2):505-518)
11方颖,等.川滇地区断层形变模型与应变积累分析[J].大地测量与地球动力学,2006,26(2):48-52.(FangYing,et al.Analysis of fault deformation model and strainaccumulation in Sichuan-Yunnan area[J].Journal of Geod-esy and Geodynamics,2006,(2):48-52,65)
1曾融生,孙为国.青藏高原岩石圈及其东部邻区的地震活动性和震源机制以及高原物质东流的讨论[J].地震学报,1992,14(增刊):523-533.(Zeng Rongsheng and SunWeiguo.Seismicity and focal mechanism in Tibetan Plateauand its implications to lithospheric flow[J].Acta Seiemolog-ica Sinica,1992,14(Supp.):523-533)
2 Royden L H,et al.Surface deformation and lower crustalflow in eastern Tibet[J].Science,1997,276(2):788-790.
3 Royden LH,Burchfiel B C and Robert D van der Hilst.Thegeological evolution of the Tibetan plateau[J].Science,2008,321:1 054-1 058.
4焦青,等.汶川8.0级地震前后龙门山断裂带活动特征浅析[J].大地测量与地球动力学,2008,(4):7-11.(JiaoQing,et al.Preliminary study on motion characteristics ofLongmenshan fault before and afterMs8.0 Wenchuan earth-quake[J].Journal of Geodesy and Geodynamics,2008,(4):7-11)
5朱守彪,张培震.2008年汶川Ms8.0地震发生过程的动力学机制研究[J].地球物理学报,2009,52(2):418-427.(Zhu Shoubiao and Zhan Peizhen.A study on the dy-namics mechanisms of the WenchuanMs8.0 earthquake,2008[J].Chinese J.Geophys.,2009,52(2):418-427)
6薄万举,杨国华.汶川Ms8.0地震前的流动形变[J].大地测量与地球动力学,2008,(6):11-15.(Bo Wanju andYang Guohua.Crustal deformation measured by mobile ob-servation before WenchuanMs8.0 earthquake[J].Journal ofGeodesy and Geodynamics,2008,(6):11-15)
7李延兴,等.汶川8.0地震孕育发生的机制与动力学问题[J].地球物理学报,2009,52(2):519-530.(Li Yanxing,et al.The mechanism and dynamics of the generation and oc-currence for Wenchuan Ms8.0 earthquake[J].Chinese J.Geophys.,2009,52(2):519-530)
8申重阳,李辉,谈洪波.汶川8.0级地震同震重力与形变效应模拟[J].大地测量与地球动力学,2008,(5):6-12.(Shen Zhongyang,Li Hui and Tan Hongbo.Simulation ofcoseismic gravity changes and deformation effect of Wen-chuanMs8.0 earthquake[J].Journal of Geodesy and Geody-namics,2008,(5):6-12)
9“中国地壳运动观测网络”项目组.GPS测定的2008年汶川Ms8.0地震的同震位移场[J].中国科学(D辑),2008,38(10):1 195-1 206.(The Project of Crustal Move-ment Observation Network of China.The coseismic displace-ment fields of WenchuanMs8.0 earthquake occurrence in2008 using GPS data[J].Science in China(Ser D),2008,38(10):1 195-1 206)
10江在森,等.汶川8.0级地震前区域地壳运动与变形动态过程[J].地球物理学报,2009,52(2):505-518.(Jiang Zaisen,et al.The dynamic process of regional crustalmovement and deformation before WenchuanMs8.0 earth-quake[J].Chinese J.Geophys.,2009,52(2):505-518)
11方颖,等.川滇地区断层形变模型与应变积累分析[J].大地测量与地球动力学,2006,26(2):48-52.(FangYing,et al.Analysis of fault deformation model and strainaccumulation in Sichuan-Yunnan area[J].Journal of Geod-esy and Geodynamics,2006,(2):48-52,65)
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