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A generalized concept of resultant gradient to interpret potential field maps[Note 1. Received September 1996, revision accepted July 1997. ...]
Author(s) -
Shaw R.K.,
Agarwal B.N.P.
Publication year - 1997
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1046/j.1365-2478.1997.740310.x
Subject(s) - anomaly (physics) , gravity anomaly , geology , free air gravity anomaly , geometry , centroid , vector field , magnetic anomaly , gravitational field , contour line , field (mathematics) , point source , point (geometry) , geodesy , amplitude , geophysics , physics , mathematics , classical mechanics , optics , bouguer anomaly , meteorology , pure mathematics , condensed matter physics
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.