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VLF surface-impedance measurements for ice-depth mapping — an assessment of some commonly encountered interference effects

  • David V. Thiel (a1), Daniel James (a1) and Peter Johnson (a1)

Abstract

The effects on very low-frequency surface-impedence measurements of lateral variations commonly found in ice environments have been measured and modelled numerically using die quasi-static two-dimensional boundary-element method. Results indicate that surface-impedance measurements made in the vicinity of crevasses oriented perpendicular to the plane Of incidence, and those made in the vicinity of moraines and melt streams, can all show significant changes to the measured apparent resistivity. It is, therefore, misleading to use such measurements in the interpretation of ice depth.

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Copyright

References

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Integrated Engineering Software. 1993. Electro. Winnipeg, Integrated Engineering Software.
Thiel, D.V. 1984. One dimensional surface impedence measurements made above an anisotropic Earth. Expl. Geophys., 15, 4346.
Thiel, D.V. 1986. A preliminary assessment of glacial ice profiling using VLF surface-impedence measurements. J. Glaciol., 32(112),376382.
Thiel, D.V. and Neall, F. 1989. VLF surface-impedence measurements for ice-depth mapping in the Antarctic. J. Glaciol., 35(120), 197200.
Wait, J.R. 1970. Electromagnetic waves in straightfield media, Second edition, Oxford, etc., Pergamon Press.

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