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Simultaneous interactive magnetic and gravity inversionNormal access

Authors: V. Menichetti and A. Guillen
Journal name: Geophysical Prospecting
Issue: Vol 31, No 6, December 1983 pp. 929 - 944
DOI: 10.1111/j.1365-2478.1983.tb01098.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 691.12Kb )

Gravity and magnetic anomalies may have the same source but it is always difficult to achieve correlated solutions if interpretations are carried out separately. Therefore it is useful to invert both anomalous gravity and magnetic profiles at the same time, so that the solution mav be more constrained.

Existing inversion techniques do not lend themselves equally to this kind of extension, since the parameters—such as density and susceptibility contrasts—should not be related. The algorithms more easily adaptable to simultaneous inversion are those which look for the shape and the position of anomalous bodies with constant unknown density or susceptibility contrasts.

In this study, we use the generalized inverse method in the 2 1/2 D case. Parameters are the coordinates of the vertices of the polygonal cross-sections of the anomalous bodies and both density and susceptibility contrasts of each body. The two types of profile to be processed must be superposable but may have different lengths, spacings, and coordinate origins. Both synthetic examples and field data from geologically known areas have been processed, and it appears that the simultaneous inversion technique may provide an important additional degree of control in the interactive interpretation process.

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