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A tomographic image of upper crustal structure using P and S wave seismic refraction data in the southern granulite terrain (SGT), India
Author(s) -
Rajendra Prasad B.,
Behera Laxmidhar,
Rao P. Koteswara
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026307
Subject(s) - geology , granulite , seismology , terrain , shear (geology) , geomorphology , petrology , facies , structural basin , ecology , biology
We present a 2‐D tomographic P and S wave velocity (V p and V s ) image with V p /V s 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 V p (6.3–6.5 km/s), V s (3.5–3.8 km/s), V p /V s (>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.