On extraction of linear and anomalous features over a part of the 85oE Ridge, Bay of Bengal for tectonic studies

Abstract

Mainly, satellite-derived FAG data have been utilized in the present paper to throw light on the structure and tectonics of the ridges depicting low FAG anomaly in the Indian offshore region: the 85oE ridge. However, additional data including bathymetry, available seismic profiles and isopach maps over the region have also been utilized. Earlier analysis suggests that both these ridges (85oE ridge, the Ninetyeast ridge) are oceanic in nature; however the low gravity anomaly is due to sagging of the crust caused by compressional forces in the 85oE ridge. Horizontal directional derivatives and sun-shading are two commonly used gradient-based filters used on satellite-derived free-air gravity images over the 85oE ridge for enhancing linear features in potential field data.