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《Chinese Journal of Geophysics》 1996-04
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THE STUDY ON THE STRUCTURE OF CRUST AND UPPER MANTLE WITH NATURAL EARTHQUAKES IN CENTRAL TIBETAN PLATEAU

JIANG MEI;LU QING-TIAN;SHI DA-NIAN;XUE GUANG-QI;G.POUPINET;A.HIRN 1)(Institute of Mineral Deposits,CAGS,Beijing 100037,China)2)(LGIT-IRIGM,University Joseph Fourier,BP53X,38041,Grenoble ,France)3)(Seismological Dept.IPGP, 4 Place Jussieu,75252 Paris,Franc  
A seismic array,consisting of 110 stations and extending for about 2000km.was deployed from Tingri in southern Tibet to Xitieshan in Qinghai.Hundreds of remote and local events were recored,the data has been processed and Interpreted by various methods. The anisotropic map for the lithospheric mantle beneath the Central tibetan Plateau ,based on the splitting character of SKS,PKS and PS waves,Shows prominent variation among tectonic blocks along the profile.thus.disclosing an important fact that the direction of anisotropy of the lithospheric mantle doesn't coincide with that of orogenic belt.Apparent disparity in anisotropy can be seen across the Yarlungzangbo suture,Pengcuo-Jiali,Tanggula pass and Kunlun pass.faults,but not for the Jinshajiang suture and Bangong-Nujinag suture.The velocity image for the depth of 400km and above,produced by travel time tomography inVersion,gives a clear picture that in the scope of near-Surface to the depth of 100km,the varying velocities are in good agreement with the surface tectonic units,there fore further evidencing the idea that the Plateau is an assemblage of blacks with different ages and histories.There are low velocity zones at every level of depth,especially beyond 150km.At the depth of 200km beneath Jinshajing suture,a body of low velocity with width of 250km and 150km downward reaching,is presumablya mantle plume.The crustal structure with alternate high and low velocity layers in norther Tibet is suggested from PS comverted waves.
【Fund】: 中、法合作"青藏高原深部结构的地质地球物理研究"项目
【CateGory Index】: P183.2
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