Published Paper Details:

The gravity and magnetic data along the profile across the southern part of the Krishna Godavari-Basin have been collected and the data is interpreted for basement depths. The profile II1is taken from Kotturu to Biyyapuppa covering a distance of 70 km .The gravity lows and highs have clearly indicated various sub basins and ridges. The density logs from ONGC, Chennai, show that the density contrast decreases with depth in the sedimentary basin, and hence, the gravity profile is interpreted using variable density contrast with depth. From the Bouguer gravity anomaly, the residual anomaly is constructed by graphical method correlating with well data, subsurface geology and seismic information. The anomaly profile is interpreted using polygon model. The maximum depths to the khondalitic basement are obtained as 2.0km, 1.60 km and 2.50 km at Krishna sub-basin,Bapatla ridge and Nizampatanam sub-basin respectively. The regional anomaly is interpreted as Moho rise towards coast. The aeromagnetic anomaly profile is also interpreted for charnockite basement below the khondalitic group of rocks using prismatic models.