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Resistive limit modeling of airborne electromagnetic data

Citation

Reid, JE and Macnae, JC, Resistive limit modeling of airborne electromagnetic data, Geophysics, 67, (2) pp. 492-500. ISSN 0016-8033 (2002) [Refereed Article]

DOI: doi:10.1190/1.1468609

Abstract

When a confined conductive target embedded in a conductive host is energized by an electromagnetic (EM) source, current flow in the target comes from both direct induction of vortex currents and current channeling. At the resistive limit, a modified magnetometric resistivity integral equation method can be used to rapidly model the current channeling component of the response of a thin-plate target energized by an airborne EM transmitter. For towed-bird transmitter-receiver geometries, the airborne EM anomalies of near-surface, weakly conductive features of large strike extent may be almost entirely attributable to current channeling. However, many targets in contact with a conductive host respond both inductively and galvanically to an airborne EM system. In such cases, the total resistive-limit response of the target is complicated and is not the superposition of the purely inductive and purely galvanic resistive-limit profiles. Numerical model experiments demonstrate that while current channeling increases the width of the resistive-limit airborne EM anomaly of a wide horizontal plate target, it does not necessarily increase the peak anomaly amplitude.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Electrical and Electromagnetic Methods in Geophysics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Reid, JE (Dr James Reid)
ID Code:24747
Year Published:2002
Web of Science® Times Cited:4
Deposited By:Earth Sciences
Deposited On:2002-08-01
Last Modified:2003-03-17
Downloads:0

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