Depth-variant azimuthal anisotropy in Tibet revealed by surface wave tomography

Pandey, Shantanu and Yuan, Xiaohui and Debayle, Eric and Tilmann, Frederik and Priestley, Keith and Li, Xueqing (2015) Depth-variant azimuthal anisotropy in Tibet revealed by surface wave tomography. Geophysical Research Letters, 42 (11). 2015GL063921. ISSN 0094–8276 DOI https://doi.org/10.1002/2015GL063921

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Abstract

Azimuthal anisotropy derived from multimode Rayleigh wave tomography in China exhibits depth-dependent variations in Tibet, which can be explained as induced by the Cenozoic India-Eurasian collision. In west Tibet, the E-W fast polarization direction at depths <100 km is consistent with the accumulated shear strain in the Tibetan lithosphere, whereas the N-S fast direction at greater depths is aligned with Indian Plate motion. In northeast Tibet, depth-consistent NW-SE directions imply coupled deformation throughout the whole lithosphere, possibly also involving the underlying asthenosphere. Significant anisotropy at depths of 225 km in southeast Tibet reflects sublithospheric deformation induced by northward and eastward lithospheric subduction beneath the Himalaya and Burma, respectively. The multilayer anisotropic surface wave model can explain some features of SKS splitting measurements in Tibet, with differences probably attributable to the limited back azimuthal coverage of most SKS studies in Tibet and the limited horizontal resolution of the surface wave results.

Item Type:	Article
Additional Information:	Corresponding author ORCID: http://orcid.org/0000-0002-2891-1354
Uncontrolled Keywords:	2015AREP; IA69
Subjects:	02 - Geodynamics, Geophysics and Tectonics
Divisions:	02 - Geodynamics, Geophysics and Tectonics 08 - Green Open Access
Journal or Publication Title:	Geophysical Research Letters
Volume:	42
Page Range:	2015GL063921
Identification Number:	https://doi.org/10.1002/2015GL063921
Depositing User:	Sarah Humbert
Date Deposited:	21 Jul 2016 11:05
Last Modified:	21 Jul 2016 11:05
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3574

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