Ice wedges in anomalous magnetic field: numerical modeling
https://doi.org/10.30758/0555-2648-2017-0-2-75-84
Abstract
Ice wedges could be sources of negative magnetic anomalies due to their low magnetic susceptibility in comparison with surrounding frozen ground. This allows their mapping using highprecision magnetic survey. The work dedicated to analyze of typical models of polygonal-wedge structures in cryolithic zone. Total magnetic field anomalies are calculated at elevations of 1–5 m above the ice wedges upper boundary level. Ice wedge width varies from 1 to 3 m while polygon sizes vary from 6 to 15 m, respectively. Magnetic susceptibility of frozen ground assumed equal to 10–3 SI. Calculated anomalies magnitude amounts from several nT to several tens of nT. Provided estimations allows defining a necessary survey precision for ice wedge mapping. Ice wedges more than 3 m wide are observable in anomalous magnetic field even in the case of covering deposits thickness of up to 4 m on the condition that covering layers are laterally relatively uniform and magnetic susceptibility of frozen ground is about 10–3 SI.
About the Author
L. V. Tsibizov
Институт нефтегазовой геологии и геофизики им. А.А. Трофимука СО РАН;
Новосибирский государственный университет
Russian Federation
Russian Federation
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For citations:
Tsibizov L.V. Ice wedges in anomalous magnetic field: numerical modeling. Arctic and Antarctic Research. 2017;(2):75-84. (In Russ.) https://doi.org/10.30758/0555-2648-2017-0-2-75-84
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