Crustal Structure from Gravity and Magnetic Anomalies in the Nizampatanam Sub-Basin of K-G Basin, Andhra Pradesh, India

M. Jyothi Prakash, T. Annapurna, D, Bhaskara Rao

Abstract: The gravity and magnetic data along the profile across the southern part of the K-G basin of India have been collected and the data is interpreted for crustal structure depths. The first profile is taken from Nadimpalem to Gokarnamaham covering a distance of 90 km and 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 residual anomaly profile is interpreted using polygon model. The maximum depths to the Khondalitic basement are obtained as 4.50 km, The regional anomaly is interpreted as Moho rise towards coast. The aeromagnetic anomaly profiles are also interpreted for charnockite basement below the Khondalitic group of rocks using prismatic models.

Keywords: Bouguer anomaly, Total Magnetic Intensity, Krishna Godavari basin, 2D Joint Modeling

How to Cite?: M. Jyothi Prakash, T. Annapurna, D, Bhaskara Rao, "Crustal Structure from Gravity and Magnetic Anomalies in the Nizampatanam Sub-Basin of K-G Basin, Andhra Pradesh, India", Volume 14 Issue 7, July 2025, International Journal of Science and Research (IJSR), Pages: 894-900, https://www.ijsr.net/getabstract.php?paperid=SR25710171341, DOI: https://dx.doi.org/10.21275/SR25710171341