Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.175..515k&link_type=abstract
Geophysical Journal International, Volume 175, Issue 2, pp. 515-519.
Astronomy and Astrophysics
Astronomy
5
Composition Of The Continental Crust, Body Waves
Scientific paper
Receiver functions constitute an important tool in regional and global studies of crust and upper-mantle structure and are frequently employed to constrain crustal thickness and bulk VP/VS ratio. The methods commonly used to compute these parameters assume a known crustal P velocity; however, this quantity trades off with crustal thickness. We demonstrate that P velocity and VP/VS ratio can be readily computed through solution of a linear system of equations incorporating traveltimes of direct conversions and free-surface reverberations, representing a range of horizontal slowness. Determination of crustal thickness follows trivially. We apply this approach to data from station HYB on the Indian craton to determine bulk VP/VS ratio, P velocity and thickness of 1.79 +/- 0.007, 6.1 +/- 0.13 kms-1 and 30.5 +/- 0.8 km, respectively. The addition of average crustal P velocity to the suite of parameters accessible from receiver function data may prove useful in constraining bulk crustal composition and its secular evolution.
Bostock Michael G.
Kumar Ravi M.
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