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Some new magnetic transformationsNormal access

Authors: A. Roy and A.O. Aina
Journal name: Geophysical Prospecting
Issue: Vol 34, No 8, December 1986 pp. 1219 - 1232
DOI: 10.1111/j.1365-2478.1986.tb00525.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 594.58Kb )

Summary:
All magnetic transformations are governed by one simple differential relation between the observed and the transformed quantities. A magnetic map for any component, at any location, and for any given direction of magnetization can be converted into one for which any one, two, or all three parameters differ.

Three new magnetic transformations are introduced: (i) reduction to equator, (ii) orthogonal reduction, and (iii) elimination of remanence. The first eliminates (or minimizes) the asymmetry and the lateral shift of the measured total field anomalies, exactly as in Baranov's reduction to pole. The second produces perfect asymmetry so that a symmetrical target lies vertically below the zero anomaly point, midway between the maximum and minimum. When remanence is a contributing factor, the direction of resultant magnetization must be known a priori in all cases, except for transformation of one component into another in the same area.

Explicit working formulae are presented for reduction to equator and pole, and orthogonal reduction.


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