Crustal structure in Central India from gravity and magnetotelluric data

The present gravity and magnetotelluric studies over a few selected transects in Central India show evidence of EW trending Palaeo-Proterozoic mantle activated rifting in the area contained between the Narmada North Fault (NNF) and Narmada South Fault (NSF). This rift was reactivated during the Neo-Proterozoic once again. After a great hiatus, left lateral movement along the NSF produced the NW-SE trending Gondwana basins in the Satpura horst region, along preexisting weak zones in the crust with dehydration of mantle rocks, south of NSF and associated upwarps. These are responsible for the many hot springs observed in the Tapti grabens and the Jabalpur earthquakes in the area. The last reactivation of NSF was seen in the Deccan volcanic episode.