The new datasets are generated from data stored in the Australian National Gravity Database; and include the Bouguer Gravity Anomaly Grid, Complete Bouguer Gravity Anomaly Grid and the Isostatic Residual Gravity Anomaly Grid.
The Complete Bouguer Gravity Anomaly Grid has had a terrain correction applied which removes the gravity effect of nearby topography variation.
High values of Bouguer gravity anomaly were encountered due to the presence of near-vertical faulting between areas of contrasting resistivity, and fault zones which may contain more or less highly contrasting density materials.
The Bouguer gravity anomaly map which one obtains from such a survey is actually a map of discrete potentials on the free surface, and any major singularity in the Bouguer gravity anomaly due to the presence of a perturbation will be due to the crossing from a "normal" into a "perturbed" area or vice versa.
Interpretation of the Bouguer gravity anomaly is the process of extracting information on the position and composition of a target mineral body in the ground.
The horizontal and the vertical derivatives of the Bouguer gravity anomaly map produced by a potential source form a Hilbert transform pair and define an analytic signal (Nabighian, 1972).