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


Contact
shantanu.pandey [ at ] awi.de

Abstract

Azimuthal anisotropy derived from multi-mode 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 multi-layer anisotropic surface wave model can explain some features of SKS splitting measurements in Tibet, with differences probably attributable to the limited backazimuthal coverage of most SKS studies in Tibet and the limited horizontal resolution of the surface wave results.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
37957
DOI 10.1002/2015GL063921

Cite as
Pandey, S. , Yuan, X. , Debayle, E. , Tilmann, F. , Priestley, K. and Li, X. (2015): Depth-variant azimuthal anisotropy in Tibet revealed by surface wave tomography , Geophysical Research Letters, 42 (11), pp. 4326-4334 . doi: 10.1002/2015GL063921


Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item