Shear-wave structure of the south indian lithosphere from rayleigh wave phase-velocity measurements

Mitra, S. ; Priestley, K. ; Gaur, V. K. ; Rai, S. S. (2006) Shear-wave structure of the south indian lithosphere from rayleigh wave phase-velocity measurements Bulletin of the Seismological Society of America, 96 (4A). pp. 1551-1559. ISSN 0037-1106

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Official URL: http://bssa.geoscienceworld.org/cgi/content/abstra...

Related URL: http://dx.doi.org/10.1785/0120050116

Abstract

We investigate the upper mantle shear-wave speed structure beneath the south Indian shield by measuring and modeling fundamental mode Rayleigh wave phase-velocity dispersion. Observed phase velocities for the south Indian shield closely match those observed for the Canadian shield. We constrain the south Indian crust using published receiver function results and invert the dispersion data for upper mantle shear-wave structure. The ~155-km-thick seismic lithosphere of the south Indian shield is composed of a 35 km-thick, two-layer crust and a ~120-km-thick, high-velocity upper mantle lid. Beneath the Moho the average Sn wave speed is ~4.7 km sec-1. Both Sn travel times data and the dispersion data suggest a positive sub-Moho shear-wave speed gradient. Beneath the seismic lithosphere there is a low- velocity layer where the shear-wave speed drops to ~4.4 km sec-1.

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Source:Copyright of this article belongs to Seismological Society of America.
ID Code:21772
Deposited On:22 Nov 2010 10:34
Last Modified:17 May 2016 05:56

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