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Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution

Felipe F. Melo, Valeria C. F. Barbosa, Leonardo Uieda, Vanderlei C. Oliveira and Joao B. C. Silva
Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution
Geophysics (November 2013) 78 (6)

Abstract

We have developed a new method that drastically reduces the number of the source location estimates in Euler deconvolution to only one per anomaly. Our method employs the analytical estimators of the base level and of the horizontal and vertical source positions in Euler deconvolution as a function of the x- and y-coordinates of the observations. By assuming any tentative structural index (defining the geometry of the sources), our method automatically locates plateaus, on the maps of the horizontal coordinate estimates, indicating consistent estimates that are very close to the true corresponding coordinates. These plateaus are located in the neighborhood of the highest values of the anomaly and show a contrasting behavior with those estimates that form inclined planes at the anomaly borders. The plateaus are automatically located on the maps of the horizontal coordinate estimates by fitting a first-degree polynomial to these estimates in a moving-window scheme spanning all estimates. The positions where the angular coefficient estimates are closest to zero identify the plateaus of the horizontal coordinate estimates. The sample means of these horizontal coordinate estimates are the best horizontal location estimates. After mapping each plateau, our method takes as the best structural index the one that yields the minimum correlation between the total-field anomaly and the estimated base level over each plateau. By using the estimated structural index for each plateau, our approach extracts the vertical coordinate estimates over the corresponding plateau. The sample means of these estimates are the best depth location estimates in our method. When applied to synthetic data, our method yielded good results if the bodies produce weak- and mid-interfering anomalies. A test on real data over intrusions in the Goias Alkaline Province, Brazil, retrieved sphere-like sources suggesting 3D bodies.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 78
Serial Issue: 6
Title: Estimating the nature and the horizontal and vertical positions of 3D magnetic sources using Euler deconvolution
Affiliation: Observatorio Nacional, Departamento de Geofisica, Rio de Janeiro, Brazil
Pages: J87-J98
Published: 201311
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 21
Accession Number: 2014-004373
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 3 tables
S19°30'00" - S12°30'00", W53°19'60" - W46°00'00"
Secondary Affiliation: Federal University of Para, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201404
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