Velocity-depth relationship in selected parts of Indian crust

Deep Seismic Sounding (DSS) studies were started in India in 1972, but till date no attempt has been made to synthesize the data to provide a bird's e ye view of the variation in crustal model. Present synthesis of seismic dat a provides a glimpse of change in the regional velocity scenario as well as basement and Moho depth configurations in selected parts of the Indian cru st. In the sedimentary basins of east-coast, Bengal and Cambay, the basemen t depth varies between 2 and 10 km, and the Proterozoic Vindhyan and Cuddap ah basins show maximum depths of 5 and 10 km respectively. The maximum Moho depth is indicated as 42-44 km in the central Indian region.