A generalized concept of resultant gradient to interpret potential field maps
R.K. Shaw and B.N.P. Agarwal
Journal name: Geophysical Prospecting
Issue: Vol 45, No 6, November 1997 pp. 1003 - 1011
Info: Article, PDF ( 717.18Kb )
The existing concept of the gradient of the potential field anomaly over a 3D source has been generalized. An observed anomaly is modified through a filter based on an assumed source geometry. The first-order derivatives of this modified anomaly in three mutually orthogonal directions form the components of a vector termed the resultant gradient. The gravity anomaly over a point mass, a vertical line mass and the gravity/magnetic anomaly reduced-to-pole over a bottomless right rectangular prism have been suitably modified to yield a specific shape for the amplitude of the resultant gradient in order to decipher the depth of the source centroid/corner. The applicability of the proposed technique is demonstrated by the analyses of a simulated example over a composite source and a real example from published literature with drill-hole information.