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Helicopter-borne and ground-towed radar surveys of the Fourcade Glacier on King George Island, Antarctica

Cited 7 time in scopus
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Title
Helicopter-borne and ground-towed radar surveys of the Fourcade Glacier on King George Island, Antarctica
Other Titles
남극 킹조지섬의 포케이드 빙하의 헬리콥터 및 지상레이다 탐사
Authors
Lee, Joohan
Hong, Jong Kuk
Kim, Ki Young
Shon, Howoong
Hong, Myung Ho
Subject
Geochemistry & Geophysics
Keywords
Fourcade Glaciers; Helicopter-borne and Ground-to; internal features; subglacial topography
Issue Date
2010
Publisher
CSIRO
Citation
Lee, Joohan, et al. 2010. "Helicopter-borne and ground-towed radar surveys of the Fourcade Glacier on King George Island, Antarctica". Exploration Geophysics, 41(1): 51-60.
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-k migration 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.
URI
http://repository.kopri.re.kr/handle/201206/5988
DOI
http://dx.doi.org/10.1071/EG09052
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