Thinning and Flow of Tibetan Crust Constrained bySeismic Anisotropy

Details Thinning and Flow of Tibetan Crust Constrained bySeismic Anisotropy Thinning and Flow of Tibetan Crust Constrained bySeismic Anisotropy

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sci...305..233s&link_type=abstract

Science, Volume 305, Issue 5681, pp. 233-236 (2004).

Physics

42

Scientific paper

Intermediate-period Rayleigh and Love waves propagating across Tibet indicate marked radial anisotropy within the middle-to-lower crust, consistent with a thinning of the middle crust by about 30%. The anisotropy is largest in the western part of the plateau, where moment tensors of earthquakes indicate active crustal thinning. The preferred orientation of mica crystals resulting from the crustal thinning can account for the observed anisotropy. The middle-to-lower crust of Tibet appears to have thinned more than the upper crust, consistent with deformation of a mechanically weak layer that flows as if confined to a channel.

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