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Automated trend reinforcement of aeromagnetic data [Note 1. Paper presented at the 57th EAGE Conference‐Geophysical Division, May‐June ...]
Author(s) -
Keating Pierre
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.1365-2478.1997.3450272.x
Subject(s) - geology , maxima and minima , aeromagnetic survey , geodesy , lineament , a priori and a posteriori , line (geometry) , remote sensing , seismology , geometry , tectonics , mathematics , magnetic field , physics , mathematical analysis , philosophy , epistemology , quantum mechanics
Aeromagnetic maps poorly represent lineaments that are at acute angles to the flight‐line direction. Commonly used gridding algorithms cannot cope with local trends, magnetic anomalies at an angle with the main trend of the map, and tend to generate closed contours around the flight lines. By introducing some a priori information, it is possible to add extra data between the flight lines, i.e. trend lines, to reinforce local trends. The proposed automated technique is based on a nearest neighbour search of the maxima and minima in the aeromagnetic map. The resulting map is more realistic and derived maps, such as vertical gradients and analytical signal maps, are greatly improved. Moreover, this automated procedure is user independent and easy to implement. The technique is demonstrated on aeromagnetic data from the Kirkland Lake region, in north‐eastern Ontario, Canada.