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Seismic and radar investigations of Fourcade Glacier on King George Island, Antarctica

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Title
Seismic and radar investigations of Fourcade Glacier on King George Island, Antarctica
Other Titles
남극 킹조지섬의 Fourcade 빙하에서 탄성파와 레이더를 이용한 연구
Authors
Kim, Ki Young
Jin, Young Keun
Shon, Howoong
Hong, Jong Kuk
Hong, Myung Ho
Lee, Joohan
Subject
Environmental Sciences & Ecology; Geology; Oceanography
Keywords
bulk density; cold/warm ice interfaces; elastic; fracture; properties
Issue Date
2010
Publisher
Blackwell
Citation
Kim, Ki Young, et al. 2010. "Seismic and radar investigations of Fourcade Glacier on King George Island, Antarctica". POLAR RESEARCH, 29(3): 298-310.
Abstract
To determine P- and S-wave velocities, elastic properties and subglacial topog- raphy of the polythermal Fourcade Glacier, surface seismic and radar surveys were conducted along a 470-m profile in November 2006. P- and S-wave velocity structures were determined by travel-time tomography and inversion of Rayleigh wave dispersion curves, respectively. The average P- and S-wave velocities of ice are 3466 and 1839 m s-1, respectively. Radar velocities were obtained by migration velocity analysis of 112 diffraction events. An estimate of 920 kg m-3 for the bulk density of wet ice corresponds to water contents of 5.1 and 3.2%, which were derived from the average P-wave and radar veloci- ties, respectively. Using this density and the average P- and S-wave velocities, we estimate that the corresponding incompressibility and rigidity of the ice are 6.925 and 3.119 GPa, respectively. Synergistic interpretation of the radar profile and P- and S-wave velocities indicates the presence of a fracture zone above a subglacial high. Here, the P- and S-wave velocities are approximately 5 and 3% less than in the ice above a subglacial valley, respectively. The S-wave velocities indicate that warmer and less rigid ice underlies 10?15 m of colder ice near the surface of the glacier. Such layering is characteristic of polythermal glaciers. As a relatively simple non-invasive approach, integration of P-tructures were determined by travel-time tomography and inversion of Rayleigh wave dispersion curves, respectively. The average P- and S-wave velocities of ice are 3466 and 1839 m s-1, respectively. Radar velocities were obtained by migration velocity analysis of 112 diffraction events. An estimate of 920 kg m-3 for the bulk density of wet ice corresponds to water contents of 5.1 and 3.2%, which were derived from the average P-wave and radar veloci- ties, respectively. Using this density and the average P- and S-wave velocities, we estimate
URI
http://repository.kopri.re.kr/handle/201206/6036
DOI
http://dx.doi.org/10.1111/j.1751-8369.2010.00174.x
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