Seismic evidence for stepwise thickening of the crust across the NE Tibetan plateau

Details Seismic evidence for stepwise thickening of the crust across the NE Tibetan plateau Seismic evidence for stepwise thickening of the crust across the NE Tibetan plateau

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002e%26psl.203...25v&link_type=abstract

Earth and Planetary Science Letters, Volume 203, Issue 1, p. 25-33.

Physics

33

Scientific paper

We performed a receiver function analysis on teleseismic data recorded along two 550 km-long profiles crossing the northeastern Tibetan plateau. Results from time to depth migration, grid-search Vp/Vs determination and simulated annealing inversion of waveforms, reveal that the crust thickens from ~50 km near the northern edge of the plateau to ~80 km south of the Jinsha suture in the Qiang Tang block. Crustal thickening occurs in staircase fashion with steps located beneath the main, reactivated sutures. The Vp/Vs ratio, close to the global continental average does not suggest widespread partial melting but rather a more usual separation between an upper felsic and a lower mafic part within the northeastern Tibetan crust.

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