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Volume 26 Issue 6
Nov 2015
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Jing Tan, Hongyi Li, Xinfu Li, Ming Zhou, Longbin Ouyang, Sanjian Sun, Dan Zheng. Radial anisotropy in the crust beneath the northeastern Tibetan Plateau from ambient noise tomography. Journal of Earth Science, 2015, 26(6): 864-871. doi: 10.1007/s12583-015-0543-x
Citation: Jing Tan, Hongyi Li, Xinfu Li, Ming Zhou, Longbin Ouyang, Sanjian Sun, Dan Zheng. Radial anisotropy in the crust beneath the northeastern Tibetan Plateau from ambient noise tomography. Journal of Earth Science, 2015, 26(6): 864-871. doi: 10.1007/s12583-015-0543-x

Radial anisotropy in the crust beneath the northeastern Tibetan Plateau from ambient noise tomography

doi: 10.1007/s12583-015-0543-x
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  • Corresponding author: Hongyi Li, lih@cugb.edu.cn
  • Received Date: 23 Apr 2015
  • Accepted Date: 17 May 2015
  • Publish Date: 01 Dec 2015
  • Through analysis of Rayleigh wave and Love wave Green's functions estimated from ambient noise tomography, we obtain radial anisotropy and shear wave velocity structure beneath the northeastern Tibetan Plateau. With two hundred and twenty three broadband seismic stations deployed by China Earthquake Administration, a collaborative seismic experiment of northern Tibet (ACSENT) experiment and northeastern Tibet seismic (NETS) experiment provide the unprecedented opportunity to resolve the spatial distribution of the radial anisotropy within the crust of the northeastern Tibetan Plateau. Discrepancies between Love (sh) and Rayleigh (sv) wave velocities show complex anisotropic patterns associated with the dynamic processes of the collision between the Indian and Eurasian plates: (1) In the upper crust, Vsv > Vsh anisotropy is dominant throughout the study area which probably reflects fossil microcracks induced by the uplift, folding and erosion geodynamic processes; (2) in the middle crust, Vsh > Vsv observed beneath the Songpan-Ganzi terrane and the northwestern Qilian orogen correlates well with a mid-crustal low velocity zone (LVZ); (3) at depths deeper than 40 km, Vsh > Vsv is still found in the Songpan-Ganzi terrane. This anisotropy could be caused by the sub-horizontal alignment of anisotropic minerals that has followed the collision between India and Eurasia. However, the northwestern Qilian orogen is associated with Vsv > Vsh anisotropy which may be related to the vertically aligned seismic anisotropic minerals caused by the crustal thickening.

     

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