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Proceedings Paper

Variability of magnetic soil properties in Hawaii
Author(s): Remke L. van Dam; J. Bruce J. Harrison; Jan M. H. Hendrickx; Brian Borchers; Ryan E. North; Janet E. Simms; Chris Jasper; Christopher W. Smith; Yaoguo Li
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Paper Abstract

Magnetic soils can seriously hamper the performance of electromagnetic sensors for the detection of buried land mines and unexploded ordnance (UXO). Soils formed on basaltic substrates commonly have large concentrations of ferrimagnetic iron oxide minerals, which are the main cause of soil magnetic behavior. Previous work has shown that viscous remanent magnetism (VRM) in particular, which is caused by the presence of ferrimagnetic minerals of different sizes and shapes, poses a large problem for electromagnetic surveys. The causes of the variability in magnetic soil properties in general and VRM in particular are not well understood. In this paper we present the results of laboratory studies of soil magnetic properties on three Hawaiian Islands: O’ahu, Kaho’olawe, and Hawaii. The data show a strong negative correlation between mean annual precipitation and induced magnetization, and a positive correlation between mean annual precipitation and the frequency dependent magnetic behavior. Soil erosion, which reduces the thickness of the soil cover, also influences the magnetic properties.

Paper Details

Date Published: 10 June 2005
PDF: 8 pages
Proc. SPIE 5794, Detection and Remediation Technologies for Mines and Minelike Targets X, (10 June 2005); doi: 10.1117/12.602876
Show Author Affiliations
Remke L. van Dam, New Mexico Tech (United States)
J. Bruce J. Harrison, New Mexico Tech (United States)
Jan M. H. Hendrickx, New Mexico Tech (United States)
Brian Borchers, New Mexico Tech (United States)
Ryan E. North, USACE-ERDC (United States)
Janet E. Simms, USACE-ERDC (United States)
Chris Jasper, Natural Resources Conservation Service (United States)
Christopher W. Smith, Natural Resources Conservation Service (United States)
Yaoguo Li, Colorado School of Mines (United States)

Published in SPIE Proceedings Vol. 5794:
Detection and Remediation Technologies for Mines and Minelike Targets X
Russell S. Harmon; J. Thomas Broach; John H. Holloway Jr., Editor(s)

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