Isostatically corrected gravity displays

Details Isostatically corrected gravity displays Isostatically corrected gravity displays

1993-12-13

1995-02-14

McElheny, Jr., Donald E.

Boots, shoes, and leggings

73382R, G06F 1568

Patent

active

053901142

ABSTRACT:
A method for producing isostatically corrected gravity displays using available gravity data sets. The values of crustal density, density contrast between lower crust and mantle, and crustal thickness at sea level required for the Airy-Heiskanen equation are determined by analysis of the data set. Crustal density is determined by fractal analysis. Density contrast is determined by cross plotting Bouguer anomaly values versus elevation. Crustal thickness is determined by plotting power spectra of free-air gravity grids. The values are then used in the Airy-Heiskanen equation to provide the value of depth to crust-mantle boundary at each data point location in order to make accurate isostatic corrections and to produce accurate isostatically corrected displays.

REFERENCES:
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patent: 4636955 (1987-01-01), Ginsburg
patent: 5282132 (1994-01-01), Trout
"Gravity and Magnetics in Oil Prospecting", L. L. Nettleton, copyright 1976 by McGraw Hill, pp. 15-21 and 278-283.
"A New Isostatic Residual Gravity Map of the Conterminous United States With A Discussion of the Significance of Isostatic Residual Anomalies" by Simpson, et al, The Journal of Geophysical Research, vol. 91, No. B8, pp. 8348-8372, Jul. 10, 1986.
"Airyroot: A Fortran Program for Calculating the Gravitational Attraction of an Airy Isostatic Root Out to 166.7 Km", United States Department of the Interior Geological Survey in Open-File Report 83-883, 1983.
"Random Fractal Forgeries", Richard F. Voss, NATO ASI Series, Vo. F17, Fundamental Algorithms for Computer Graphics, pp. 806-829.
"Gravity Anomalties and Flexure of the Lithosphere at Mountain Ranges", G. D. Karner, et al, Journal of Geophysical Research, vol. 88, No. B12, pp. 10,449-10,477, Dec. 10, 1983.

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