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The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin

Abstract


Houston Geological Society Bulletin, Volume 55, No. 05, January, 2013. Pages 58 and 59.

Abstract: Radial anisotropy in the northeastern Tibetan Plateau from Surface Previous HitWaveNext Hit Tomography

Lun Li, Ph.D. Candidate, Geology

Three-dimensional anisotropic shear Previous HitwaveNext Hit velocity structure and radial anisotropic model of lower crust and upper mantle beneath NE Tibetan plateau are constructed from measurements of Love Previous HitwaveNext Hit dispersions and previously obtained Rayleigh Previous HitwaveNext Hit dispersion in order to answer two important questions regarding the plateau dynamics: (1) whether the deformation in the crust and upper mantle is coupled; (2) whether asthenosphere upwelling exists beneath the NE Tibetan Plateau. We have analyzed Love waves recorded at the Northeast Tibet Seismic (NETS) array and applied the two-plane-Previous HitwaveNext Hit tomography method to compute average and 2-D phase velocities. Transverse component seismograms from 66 events at 36 stations were filtered at 14 center frequencies with a narrow bandwidth of 10 mHz. Average phase velocity varies from 3.55 km/s at 20 s to 4.55 km/s at 100 s, which are higher than previously obtained Rayleigh Previous HitwaveNext Hit phase velocities at corresponding periods. 2-D variation of Love phase velocity was calculated at the periods from 20 s to 100 s using 2-D, Born sensitivity kernels. Low-velocity anomalies are imaged along and to the south of the Kunlun fault at each period, similar as from Rayleigh Previous HitwaveNext Hit tomography. However, the magnitude and size of the low phase velocity are much stronger and larger in Love Previous HitwaveNext Hit images than in the Rayleigh Previous HitwaveNext Hit maps. We invert the 2-D phase velocities of Rayleigh and Love waves in the period range from 20 to 100 s simultaneously, to construct a radially anisotropic shear Previous HitwaveNext Hit velocity model. Such anisotropic properties, which cannot readily be obtained from body Previous HitwaveTop studies only, can provide new insights into geodynamic process in this tectonically actively region.

 

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