High-velocity anomaly under the deccan volcanic province

Ramesh, D. S. ; Srinagesh, D. ; Rai, S. S. ; Prakasam, K. S. ; Gaur, V. K. (1993) High-velocity anomaly under the deccan volcanic province Physics of The Earth and Planetary Interiors, 77 (3-4). pp. 285-296. ISSN 0031-9201

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003192...

Related URL: http://dx.doi.org/10.1016/0031-9201(93)90104-H


Tomographic modelling of P-wave residuals at 22 vertical-component seismograph stations operated in the Deccan Volcanic Province (DVP) in west-central India and the Dharwar Craton point to the existence of a large, deep (at least 300 km), high-velocity anomaly (1-3% faster) directly beneath most of the DVP and Dharwar Craton. There is also marginal evidence that the westernmost part of the DVP may be characterised by low velocity (up to -1.5%) to a depth of about 200 km. This coherent high-velocity anomaly under the DVP and its extension into the south Indian shield is viewed as a lithospheric root, an architecture characteristic of Precambrian shields.

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