Thinning and flow of Tibetan crust constrained by seismic anisotropy

Nikolai M. Shapiro, Michael H. Ritzwoller, Peter Molnar, Vadim Levin

Research output: Contribution to journalArticlepeer-review

239 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)233-236
Number of pages4
JournalScience
Volume305
Issue number5681
DOIs
StatePublished - Jul 9 2004

All Science Journal Classification (ASJC) codes

  • General

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