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Spherical-earth gravity and magnetic anomaly modeling by Gauss-Legendre quadrature integrationGauss-Legendre quadrature integration is used to calculate the anomalous potential of gravity and magnetic fields and their spatial derivatives on a spherical earth. The procedure involves representation of the anomalous source as a distribution of equivalent point gravity poles or point magnetic dipoles. The distribution of equivalent point sources is determined directly from the volume limits of the anomalous body. The variable limits of integration for an arbitrarily shaped body are obtained from interpolations performed on a set of body points which approximate the body's surface envelope. The versatility of the method is shown by its ability to treat physical property variations within the source volume as well as variable magnetic fields over the source and observation surface. Examples are provided which illustrate the capabilities of the technique, including a preliminary modeling of potential field signatures for the Mississippi embayment crustal structure at 450 km.
Document ID
19810060786
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Von Frese, R. R. B.
(Purdue Univ. West Lafayette, IN, United States)
Hinze, W. J.
(Purdue Univ. West Lafayette, IN, United States)
Braile, L. W.
(Purdue University West Lafayette, IN, United States)
Luca, A. J.
(Chevron Geophysical Co. Calgary, Alberta, Canada)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Publication Information
Publication: Journal of Geophysics - Zeitschrift fuer Geophysik
Volume: 49
Issue: 3, 19
Subject Category
Geophysics
Accession Number
81A45190
Funding Number(s)
CONTRACT_GRANT: NAS5-25030
Distribution Limits
Public
Copyright
Other

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