Crustal seismic anisotropy in central Tibet: Implications for deformational style and flow in the crust

Details Crustal seismic anisotropy in central Tibet: Implications for deformational style and flow in the crust Crustal seismic anisotropy in central Tibet: Implications for deformational style and flow in the crust

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3123601o&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 23, CiteID L23601

Physics

20

Seismology: Continental Crust (1242), Seismology: Theory And Modeling, Tectonophysics: Continental Contractional Orogenic Belts, Tectonophysics: Rheology-Crust And Lithosphere, Information Related To Geographic Region: Asia

Scientific paper

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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