Determination of the Free-Air Gravity anomalies over Brong-Ahafo Region of Ghana

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Free-air gravity anomalies over Brong-Ahafo Region of Ghana on a regular 2.5×2.5 arc minute grid is determined from combined surface gravity and digital elevation model data using Simple Bouguer anomaly procedure and Gravity Reconstruction method of gridding. The Geodetic Reference System 1980 (GRS80) ellipsoid was used as the reference ellipsoid for computation of the normal gravities at the grid points. The results of this study shows that the residual free-air gravity anomalies over Brong- Ahafo Region range from -63.07 to -3.56 mGal, with the negative values indicating places where the normal gravity values are higher than the corresponding free-air values and that the ellipsoid is below the geoid surface.
A thesis submitted to the Department of Geomatic Engineering, Kwame Nkrumah University of Science and Technology in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE.