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Helicopter-borne and ground-towed radar surveys of the Fourcade Glacier on King George Island, Antarctica
- Source :
- Exploration Geophysics; March 2010, Vol. 41 Issue: 1 p51-60, 10p
- Publication Year :
- 2010
-
Abstract
- To determine subglacial topography and internal features of the Fourcade Glacier on King George Island in Antarctica, helicopter-borne and ground-towed ground-penetrating radar (GPR) data were recorded along four profiles in November 2006. Signature deconvolution, f-kmigration velocity analysis, and finite-difference depth migration applied to the mixed-phase, single-channel, ground-towed data, were effective in increasing vertical resolution, obtaining the velocity function, and yielding clear depth images, respectively. For the helicopter-borne GPR, migration velocities were obtained as root-mean-squared velocities in a two-layer model of air and ice. The radar sections show rugged subglacial topography, englacial sliding surfaces, and localised scattering noise. The maximum depth to the basement is over 79 m in the subglacial valley adjacent to the south-eastern slope of the divide ridge between Fourcade and Moczydlowski Glaciers. In the ground-towed profile, we interpret a complicated conduit above possible basal water and other isolated cavities, which are a few metres wide. Near the terminus, the GPR profiles image sliding surfaces, fractures, and faults that will contribute to the tidewater calving mechanism forming icebergs in Potter Cove.
Details
- Language :
- English
- ISSN :
- 08123985 and 18347533
- Volume :
- 41
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Exploration Geophysics
- Publication Type :
- Periodical
- Accession number :
- ejs48449609
- Full Text :
- https://doi.org/10.1071/EG09052