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Ozacar & Zandt 2004
Ozacar, A.A. and Zandt, G. (2004). Crustal seismic anisotropy in central Tibet: Implications for deformational style and flow in the crust. Geophysical Research Letters 31: doi: 10.1029/2004GL021096. issn: 0094-8276.

Receiver functions obtained at INDEPTH III stations located near the Bangong-Nujiang suture in central Tibet display a weak Moho signal and strong P to S conversions within the first 5 s that vary systematically with back-azimuth. A single station with representative azimuthal variations located at the sharp onset of strong SKS splitting, is modeled for both dipping layers and seismic anisotropy by using a global minimization technique. Inversion results indicate strong anisotropy (>10%) near the surface and in the middle crust separated by a south-dipping (~25¿) layer, possibly related to the earlier phase of crustal shortening. Near-surface anisotropy has a fabric dipping steeply southward and trending WNW-ESE that correlates with the suture and younger strike-slip faults. In contrast, mid-crustal anisotropy occurs in a low-velocity zone and has a fabric dipping gently (~18¿) northward that might be related to a well-developed near-horizontal rock fabric induced by crustal flow.

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Abstract

Keywords
Seismology, Continental crust, Seismology, Theory and modeling, Tectonophysics, Continental contractional orogenic belts, Tectonophysics, Rheology—crust and lithosphere, Information Related to Geographic Region, Asia
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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