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

Jing Tan; Hongyi Li; Xinfu Li; Ming Zhou; Longbin Ouyang; Sanjian Sun; Dan Zheng

doi:10.1007/s12583-015-0543-x

Volume 26 Issue 6

Nov 2015

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Journal of Earth Science > 2015 > 26(6): 864-871.

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

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

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

doi: 10.1007/s12583-015-0543-x

Jing Tan^{1, 2, 3},
Hongyi Li^{1, 3
,
,},
Xinfu Li^{1, 3},
Ming Zhou^{1, 3},
Longbin Ouyang^{1, 3},
Sanjian Sun^{1, 3},
Dan Zheng^{1, 3}

1.
Key Laboratory of Geo-Detection, Ministry of Education, China University of Geosciences, Beijing 100083, China
2.
Geological Exploration Technologies Institute of Anhui Province, Hefei 230031, China
3.
School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: Hongyi Li, lih@cugb.edu.cn
Received Date: 23 Apr 2015
Accepted Date: 17 May 2015
Publish Date: 01 Dec 2015

Abstract

Abstract

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, V_sv > V_sh 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, V_sh > V_sv 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, V_sh > V_sv 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 V_sv > V_sh anisotropy which may be related to the vertically aligned seismic anisotropic minerals caused by the crustal thickening.
- northeastern Tibetan Plateau,
- ambient noise tomography,
- radial anisotropy

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References(34)

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

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