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

• Published in: Journal of Glaciology
• Main Authors: Thiel, David V., James, Daniel, Johnson, Peter
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 1996
• Subjects: Earth-Surface Processes; Journal of Glaciology
• Online Access: http://dx.doi.org/10.1017/s0022143000030501; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000030501

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.