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Topographic responses in magnetometric resistivity modeling

Chieh-Hou Yang and Hung-Wen Tseng
Topographic responses in magnetometric resistivity modeling
Geophysics (November 1992) 57 (11): 1409-1418


The magnetometric resistivity (MMR) topographic responses due to earth topography were simulated using a finite-element method. An algorithm was developed and the computer program was verified by comparison with analytic responses for half-space and contact models. The topographic responses for different rugged surfaces were computed, and the model results indicate topographic effects can affect MMR sounding interpretation. In general, MMR topographic responses do depend on surface form; the more rugged the ground surface is, the larger the MMR topographic anomaly will be. These topographic effects will decrease as the distance between the source (and/or receiver) position and the high relief area is increased. We only address the problem of determining MMR anomalies over a two-dimensional (2-D) topography. A numerical example illustrates an effective means of reducing the terrain effects for a 45-degree dipping fault model incorporating a 45-degree ramp surface, suggesting that the finite-element modeling technique does provide a means of determining topographic correction for MMR sounding data.

ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 57
Serial Issue: 11
Title: Topographic responses in magnetometric resistivity modeling
Affiliation: National Central University, Institute of Geophysics, Chungli, Taiwan
Pages: 1409-1418
Published: 199211
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 8
Accession Number: 1992-066295
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: University of California at Berkeley, USA, United States
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: 1992
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