Interpretation of Magnetic Gradients Due to Buried Sloping Steps

D. Atchuta Rao; H. V. Ram Babu

doi:10.1071/EG981089

ISSN: 0812-3985
E-ISSN: 1834-7533

Interpretation of Magnetic Gradients Due to Buried Sloping Steps
Authors D. Atchuta Rao^a and H. V. Ram Babu^a
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^a National Geophysical Research Institute, Hyderabad, 500 007, , India
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 12, Issue 4, Dec 1981, p. 89 - 92
DOI: https://doi.org/10.1071/EG981089
- Published online: 01 Dec 1981

Abstract

Two functions, H(x) and V(x) involving the combinations of both the horizontal Tx(x) and vertical Th(x) gradients of the total magnetic intensity anomaly due to a buried sloping step are defined as

H(x) = Tx(x) cos 2/β + Th(x) sin 2/β and

V(x) = Th (x) cos 2/β - Tx (x) sin 2/β

where β is the effective inclination of the magnetization vector. By combining the two gradients Tx(x) and Th(x) in this fashion the effect of inclination of the inducing field is removed in the two functions H(x) and V(x). Characteristic points on H(x) and V(x) curves such as zero crossings and equi-gradients are used to evaluate the parameters of the step. This technique can be extended easily to magnetic anomalies in vertical and horizontal components.

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1981-12-01

2026-01-16

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References

Grant, F. S. & West, G. F. (1965), Interpretation Theory in Applied Geophysics, McGraw Hill Co., New York.
Green, R. (1980), ‘Field processing of magnetic data’, Geophys. Prosp. 28,384-91.
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Hall, D. H. (1968a), ‘A magnetic interpretation method for calculating body parameters for buried sloping steps and thick sheets’, Geoexptoration 6, 187-206.
Hall, D. H. (19686), ‘Regional magnetic anomalies, magnetic units and crustal structure in the Kenora district of Ontario’, Can. J. Earth Sci. 5, 1277-96.
Henderson, R. G. (1966), ‘Field continuation and the step model in aeromagnetic interpretation’, Geophys. Prosp. 14, 530-46.
Hood, P. (1965), ‘Gradient measurements in aeromagnetic surveying’. Geophysics 30, 891-902.
Hood, P. & McClure, D. J. (1965), ‘Gradient measurements in ground magnetic prospecting’. Geophysics 30, 403-10.
Murthy, I. V. R. & Rao, C. V. (1974), ‘A note on the (sin x)/x method of continuation’, Boll. Di Geofisica Teorica Ed Applicata 16,223-31.

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Article Type: Research Article

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Interpretation of Magnetic Gradients Due to Buried Sloping Steps

Abstract

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