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Rajendra Prasad et al. 2006
Rajendra Prasad, B., Behera, L. and Rao, P.K. (2006). A tomographic image of upper crustal structure using P and S wave seismic refraction data in the southern granulite terrain (SGT), India. Geophysical Research Letters 33: doi: 10.1029/2006GL026307. issn: 0094-8276.

We present a 2-D tomographic P and S wave velocity (Vp and Vs) image with Vp/Vs ratios along N-S trending 220 km long deep seismic profile acquired in 2005, which traverses across major shear and tectonically disturbed zones in southern granulite terrain (SGT), India. The 2-D velocity model constrained down to maximum 8 km depth shows velocity anomalies (>0.2 km/s) beneath major shear zones with good spatial resolution (>0.05 km/s). The presence of high Vp (6.3--6.5 km/s), Vs (3.5--3.8 km/s), Vp/Vs (>1.75) and Poisson's ratio (0.25--0.29) indicate significant compositional changes of rocks at shallow depths (0.5 to 8 km) reveal rapid crustal exhumation of mid to lower crustal rocks. This crustal exhumation could be responsible due to Pan-African tectonothermal activity during Neoproterozoic period.

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Continental crust, Seismology, Tomography (6982, 8180), Hydrology, Rocks, physical properties, Exploration Geophysics, Seismic methods (3025, 7294)
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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