青藏高原中南部近期地壳水平形变
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摘要
以1999—2011年西藏、青海地区GPS区域站观测结果为基础,利用欧拉模型、多核函数法和球面应变模型,计算了青藏高原中南部地区区域整体无旋转基准下的运动场和应变场,对汶川地震前后两个时段的结果进行了对比分析。结果显示:青藏高原中南部地区多年来的总体运动特征未发生较大改变,整体以东西向拉张运动为主,中部以南北向的压缩变形为主,并且由南向北逐渐向两侧分异。北向运动主要集中在喜马拉雅块体和拉萨块体的中部,在拉萨块体的北部,北向运动已明显减弱。而在拉萨块体与羌塘块体分界处,区域运动方向已经明显转为东西向运动。汶川地震以后研究区东向运动有一定加强。
Based on the GPS regional station observations from 1999—2011 in the Tibet and Qinghai areas,using Euler model,multi-kernel function method and the spherical strain model,the regional No-Net-Rotation frame motion field and strains are calculated in the central and southern Qinghai-Tibet Plateau,and compares and analyses the results before and after the Wenchuan earthquake.The results show: The general movement features of the study area did not change greatly over the years.The crust motion is generally the East-West tensive movement on the whole.In the central area,the crust motion is primarily the North-South compressive movement,and disparts from south to north gradually.The north movement is mainly concentrated in the central Himalaya block and Lhasa block,and obviously weakened in the north Lhasa block.While in boundary of the Lhasa block and Qiangtang block,the motion changes obviously as the East-West movement.The eastward motion is strengthened in the study area after the Wenchuan earthquake.
Based on the GPS regional station observations from 1999—2011 in the Tibet and Qinghai areas,using Euler model,multi-kernel function method and the spherical strain model,the regional No-Net-Rotation frame motion field and strains are calculated in the central and southern Qinghai-Tibet Plateau,and compares and analyses the results before and after the Wenchuan earthquake.The results show: The general movement features of the study area did not change greatly over the years.The crust motion is generally the East-West tensive movement on the whole.In the central area,the crust motion is primarily the North-South compressive movement,and disparts from south to north gradually.The north movement is mainly concentrated in the central Himalaya block and Lhasa block,and obviously weakened in the north Lhasa block.While in boundary of the Lhasa block and Qiangtang block,the motion changes obviously as the East-West movement.The eastward motion is strengthened in the study area after the Wenchuan earthquake.
引文
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15金胜,等.班公-怒江构造带的电性结构特征——大地电磁探测结果[J].地球物理学报,2009,52(10):2666-2 675.(Jin Sheng,et al.The electrical structure ofBangong-Nujiang suture:results from magnetotelluricsounding detection[J].Chinese Journal of Geophysics,2009,52(10):2 666-2 675)
2杨博,等.球面水平应变场无偏计算的实现与滤波[J].地震研究,2011,34(1):59-66.(Yang Bo,et al.Non-devia-tion calculation and filtering of spherical horizontal strainfield[J].Journal of Seismological,2011,34(1):59-66)
3占伟,等.GNSS流动观测水平速度精度评估[J].大地测量与地球动力学,2011,(5):84-87.(Zhan Wei,et al.Accuracy evaluation of horizontal velocity measured by GNSSmobile observation[J].Journal of Geodesy and Geodynam-ics,2011,(5):84-87)
4贺日政,高锐.西藏高原南北向裂谷研究意义[J].地球物理学进展,2003,18(1):35-43.(He Rizheng and GaoRui.Some significances of studying north southern rift in Ti-bet plateau[J].Progress in Geophysics,2003,18(1):35-43)
5高名修.青藏高原南缘现今地球动力学研究[J].地震地质,1996,18(2):143-155.(Gao Mingxiu.A study onrecent geodynamics at the southern margin of the Qinghaixi-zang(Tibet)plateau[J].Seismology and Geology,1996,18(2):143-155)
6熊熊,等.青藏高原的地幔动力学研究[J].地球科学进展,2005,20(9):970-979.(Xiong Xiong,et al.A studyof mantle dynamics of the Tibetan plateau[J].Advance inEarth Sciences,2005,20(9):970-979)
7张进江.北喜马拉雅及藏南伸展构造综述[J].地质通报,2007,26(6):639-649.(Zhang Jinjiang.A review onthe extensional structures in the northern Himalaya andsouthern Tibet[J].Geological Bulletin of China,2007,26(6):639-649)
8贺日政,高锐,郑洪伟.西藏高原东西向伸展机制动力学成因[J].中国地球物理,2011:134.(He Rizheng,Gao Ruiand Zheng Hongwei.The research of E-W trend tectonics inTibetan Plateau[J].The Chinese Geophysics,2011:134)
9杨立强,等.青藏高原的隆升过程与地球动力学模型研究进展[J].地球物理学进展,2001,16(1):70-81.(YangLiqiang,et al.Progress on uplift of process and geodynamicmodel of Tibetan plateau[J].Progress In Geophysics,2001,16(1):70-81)
10滕吉文,等.青藏高原腹地东西分区和界带的地球物理场特征与动力学响应[J].地球物理学报,2011,54(10):2 510-2 527.(Teng Jiwen,et al.Geophysical field charac-teristics and dynamic response of segmentations in east-westdirection and their boundary zone in central Tibetan plateau[J].Chinese Journal of Geophysics,2011,54(10):2 510-2 527)
11白登海,等.大地电磁观测揭示青藏高原东部存在两条地壳物质流[J].中国基础科学,2011,(1):7-10.(BaiDenghai,et al.Crustal flow beneath eastern Tibetan plateaurevealed by magnetotelluric measurements[J].China BasicScience,2011,(1):7-10)
12李永华,等.青藏高原拉萨及羌塘块体的地壳结构研究[J].地震学报,2006,28(6):586-595.(Li Yonghua,et al.The crustal structure beneath Qiangtang and Lhasaterrene from receiver function[J].Acta Seismologica Sini-ca,2006,28(6):586-595)
13许志琴,等.喜马拉雅东构造结-南迦巴瓦构造及组构运动学[J].岩石学报,2008,24(7):1463-1476.(XuZhiqin,et al.Tectonics and fabric kinematics of theNamche Barwa terrene,Eastern Himalayan Syntaxis[J〗.Acta Petrologica Sinica,2008,24(7):1 463-1 476)
14谭捍东,等.从INDEPTH-MT结果探讨雅鲁藏布江缝合带的电性结构[J].现代地质,1997,11(3):375-378.(Tan Handong,et al.An approach on subduction ofIndian plate from INDEPTH-MT results[J].Geoscience-Journal of Graduate School,China University of Geosci-ences,1997,11(3):375-378)
15金胜,等.班公-怒江构造带的电性结构特征——大地电磁探测结果[J].地球物理学报,2009,52(10):2666-2 675.(Jin Sheng,et al.The electrical structure ofBangong-Nujiang suture:results from magnetotelluricsounding detection[J].Chinese Journal of Geophysics,2009,52(10):2 666-2 675)
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