Crustal Velocity Model in the Eastern Part of the Indian Peninsular Shield

The velocity analysis of the first arrival refraction data, along the two deep seismic sounding profiles in the eastern part of the Indian Peninsular shield has yielded a zone of high velocity at 3 to 15km depth within the limits of the Eastern Ghat Mobile Belt towards east of the Cuddapah basin. The analysis also indicates that the crustmantle boundary in the eastern part of the Indian shield is highly disturbed due to the intrusion from the upper mantle through the lower crust and, therefore, can be termed as transitional.