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GEOREF RECORD

Reduction of potential field data to a horizontal plane

Mark Pilkington and W. E. S. Urquhart
Reduction of potential field data to a horizontal plane
Geophysics (May 1990) 55 (5): 549-555

Abstract

Most existing techniques for potential field data enhancement and interpretation require data on a horizontal plane. Hence, when observations are made on an irregular surface, reduction to a horizontal plane is necessary. To effect this reduction, an equivalent source distribution that models the observed field is computed on a mirror image of the observation surface. This irregular mirror image surface is then replaced by a horizontal plane and the effect of the equivalent sources is computed on the required horizontal level. This calculated field approximates the field reduced to a horizontal plane.The good quality of this approximation is demonstrated by two-dimensional synthetic data examples in which the maximum errors occur in areas of steep topographic gradients and increased magnetic field intensity. The approach is also applied to a portion of a helicopter-borne aeromagnetic survey from the Gaspe region in Quebec, Canada, where the results are a horizontal shifting of anomaly maxima of up to 150 m and changes in anomaly amplitudes of up to 100 nT.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 55
Serial Issue: 5
Title: Reduction of potential field data to a horizontal plane
Affiliation: Geol. Surv. Can., Geophys. Div., Ottawa, ON, Canada
Pages: 549-555
Published: 199005
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 10
Accession Number: 1990-031414
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N47°49'60" - N49°15'00", W68°00'00" - W64°15'00"
Secondary Affiliation: Urquhart Dvorak, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 1990
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