PROJECT EQUANT BATHYMETRY, GRAVITY AND MAGNETIC ANOMALY MAPS OT THE NORTHERN CONTINENTAL MARGIN OF BRASIL

Using EQUANT project data from both 1987 and 1988, three primary grids were created for the Equatorial Margin of Brasil: bathymetry, gravity, free-air anomaly (FAA), and diurnally corrected magnetic anomaly. The bathymetry and free-air grids were combined to form a simple Bouguer anomaly (SBA) grid for various reduction densities. In order to assist the interpretation, further processing of these grids resulted in regional/residual separation of anomalies; first and second derivative grids from the gravity and magnetics grids; and generation of statistical variance grids. Lineation analysis and structural interpretation followed.