Gravity anomalies over a segment of Pratap ridge and adjoining shelf margin basin, western continental margin of India

Abstract

Bathymetric and gravity data totalling 2000 line km on the continental margin off Goa and Mulki, west of India have been studied. The free-air gravity anomalies vary between -60 to 25 mgals with prominent NNW-SSE trends in the outer shelf region and ENE-WSW trends in the midshelf region. The subsurface extensions of the Prathap Ridge and shelf margin basin towards north and south were mapped. Two-dimensional model studies were carried out to infer the crustal structure. These studies revealed maximum thickness of 4 km. sediments over the shelf margin basin and the thickness of the crust thins out to 24 km towards offshore