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Journal Articles Journal of Applied Geophysics Year : 2017

3D linear inversion of magnetic susceptibility data acquired by frequency domain EMI

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Abstract

Low induction number EMI instruments are able to simultaneously measure a soil's apparent magnetic susceptibility and electrical conductivity. This family of dual measurement instruments is highly useful for the analysis of soils and archeological sites. However, the electromagnetic properties of soils are found to vary over considerably different ranges: whereas their electrical conductivity varies from ≤ 0.1 to ≥ 100 mS/m, their relative magnetic permeability remains within a very small range, between 1.0001 and 1.01 SI. Consequently, although apparent conductivity measurements need to be inverted using non-linear processes, the variations of the apparent magnetic susceptibility can be approximated through the use of linear processes, as in the case of the magnetic prospection technique.
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Dates and versions

hal-01482186 , version 1 (03-03-2017)

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J. Thiesson, Alain Tabbagh, F.-X. Simon, M. Dabas. 3D linear inversion of magnetic susceptibility data acquired by frequency domain EMI. Journal of Applied Geophysics, 2017, 136, pp.165 - 177. ⟨10.1016/j.jappgeo.2016.10.038⟩. ⟨hal-01482186⟩
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