HR: 0830h
AN: C31B-0396    [PDF]
TI: Glacial Till Detection Experiments With Transient Electromagnetic Methods
AU: * Bucki, A K
EM: akbucki@gi.alaska.edu
AF: Geophysical Institute, University of Alaska, Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775 United States
AU: Adema, G
EM: guy_adema@nps.gov
AF: Denali National Park, PO Box 9, Mile Post 229 Parks Hwy, Denali National Park, AK 99755
AB: Transient Electromagnetic (TEM) investigations have been carried out on Fireweed Rock Glacier in Wrangell-St. Elias National Park, Alaska and the East Fork Toklat Glacier in Denali National Park, Alaska. TEM methods were effective in determining the geometry of the rock glacier but were more limited in resolution on the ice glacier. A conductive layer beneath the rock glacier was identified, and its distribution is consistent with a till-like layer. A similar layer was not detected beneath the glacier; the lack of this conductive layer limits the resolution of glacial depth. These experiments and forward modeling indicate that TEM methods may provide a means for detecting a sufficiently thick and conductive till layer beneath glaciers and rock glaciers.
DE: 1827 Glaciology (1863)
SC: Cryosphere [C]
MN: 2003 Fall Meeting