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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]
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 |
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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 |
UTAS Author: | Reid, JE (Dr James Reid) |
ID Code: | 24747 |
Year Published: | 2002 |
Web of Science® Times Cited: | 6 |
Deposited By: | Earth Sciences |
Deposited On: | 2002-08-01 |
Last Modified: | 2003-03-17 |
Downloads: | 0 |
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