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Long-wavelength magnetic and gravity anomaly correlations on Africa and EuropePreliminary MAGSAT scalar magnetic anomaly data were compiled for comparison with long-wavelength-pass filtered free-air gravity anomalies and regional heat-flow and tectonic data. To facilitate the correlation analysis at satellite elevations over a spherical-Earth, equivalent point source inversion was used to differentially reduce the magnetic satellite anomalies to the radial pole at 350 km elevation, and to upward continue the first radial derivative of the free-air gravity anomalies. Correlation patterns between these regional geopotential anomaly fields are quantitatively established by moving window linear regression based on Poisson's theorem. Prominent correlations include direct correspondences for the Baltic shield, where both anomalies are negative, and the central Mediterranean and Zaire Basin where both anomalies are positive. Inverse relationships are generally common over the Precambrian Shield in northwest Africa, the Basins and Shields in southern Africa, and the Alpine Orogenic Belt. Inverse correlations also presist over the North Sea Rifts, the Benue Rift, and more generally over the East African Rifts. The results of this quantitative correlation analysis support the general inverse relationships of gravity and magnetic anomalies observed for North American continental terrain which may be broadly related to magnetic crustal thickness variations.
Document ID
19850023284
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Vonfrese, R. R. B.
(Ohio State Univ. Columbus, OH, United States)
Olivier, R.
(Lausanne Univ. Lafayette, Ind., United States)
Hinze, W. J.
(Purdue Univ.)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Publication Information
Publication: Purdue Univ. Improving the Geol. Interpretation of Magnetic and Gravity Satellite Anomalies
Subject Category
Earth Resources And Remote Sensing
Accession Number
85N31597
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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