Physics – Geophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120401k&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 20, CiteID L20401
Physics
Geophysics
7
Exploration Geophysics: Seismic Methods (3025), Physical Properties Of Rocks: Acoustic Properties, Hydrology: Glaciology (1863), Information Related To Geographic Region: Antarctica
Scientific paper
Seismic data from Rutford Ice Stream, West Antarctica show high amplitude, reversed-polarity reflections from parts of the bed. Only interfaces between ice and water, or between water and sediment have the acoustic properties to produce such strong reflections - ice/sediment interfaces produce much weaker echoes. The evidence suggests that an area of the ice stream measuring at least 1 km by 0.2 km is underlain by water with a depth of less than 1 m. The data are consistent with the presence of a sub-ice drainage system comprising shallow canals cut into the sedimentary substrate, as predicted by theory.
King Edward C.
Smith Matthew A.
Woodward John
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