Browse > Article

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

Kim, K.Y. (Department of Geophysics, Kangwon National University)
Lee, J. (Korea Polar Research Institute)
Hong, M.H. (Department of Geophysics, Kangwon National University)
Hong, J.K. (Korea Polar Research Institute)
Shon, H. (Department of Civil, Environmental and Railroad Engineering, Pai Chai University)
Publication Information
Geophysics and Geophysical Exploration / v.13, no.1, 2010 , pp. 51-60 More about this Journal
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 79m 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.
Keywords
Fourcade Glaciers; helicopter-borne and ground-towed GPR; internal features; subglacial topography;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Stolt, R. H., 1978, Migration by Fourier transform: Geophysics, 43, 23–48. doi:10.1190/1.1440826
2 Irvine-Fynn, T. D., Moorman, B. J., Williams, J. L. M., and Water, F. S. A., 2006, Seasonal changes in ground-penetrating radar signature observed at a polythermal glacier, Bylot Island, Canada: Earth Surface Processes and Landforms, 31, 892–909. doi:10.1002/esp.1299
3 Jezek, K. C., and Roeloffs, E. A., 1983, Measurements of radar wave speeds in polar glaciers using down-hole radar target technique: Cold Regions Science and Technology, 8, 199–208. doi:10.1016/0165-232X(83)90010-1
4 Kim, K. Y., Lee, J., Hong, M. H., Hong, J. K., Jin, Y. G., and Shon, H., 2010, Seismic and Radar Investigations of the Fourcade Glacier on King George Island, Antartica: Polar Research.
5 Simoes, J. C., Gobmann, H., Delmas, R. J., and Moskalevsky, M. Y., 2004, Glaciological research in King George Island: Missions and developments in the 1990s: Pesquisa Antarctica Brasileira, 4, 1–4.
6 Travassos, J. M., and Simoes, J. C., 2004, High-resolution radar mapping of internal layers of a subpolar ice cap, King George Island, Antarctica: Pesquisa Antarctica Brasileira, 4, 9–23.
7 Ziolkowski, A., 1991, Why don't we measure seismic signatures?: Geophysics, 56, 190–201. doi:10.1190/1.1443031
8 Kim, K. Y., Hong, M. H., Shon, H., and Lee, J. H., 2006, Enhancement of vertical resolution of GPR data though signature deconvolution: Journal of Korean Geophysicists Society, 9, 1–6.
9 Robin, G. de Q., 1975, Velocity of radio waves in ice by means of a bore-hole interferometric technique: Journal of Glaciology, 15, 151–159.
10 Murray, T., Stuart, G. W., Fry, M., Gamble, N. H., and Crabtree, M. D., 2000, Englacial water distribution in a temperate glacier from surface and borehole radar velocity analysis: Journal of Glaciology, 46, 389–398. doi:10.3189/172756500781833188
11 Moran, M. L., Greenfield, G. J., Arcone, S. A., and Delaney, A. J., 2000, Delineation of a complexly dipping temperate glacier bed using short pulse radar arrays: Journal of Glaciology, 46, 274–286. doi:10.3189/172756500781832882
12 Claerbout, J. F., 1985, Imaging the earth's interior: Blackwell Scientific Publications.
13 Maijala, P., Moore, J. C., Hjelt, S.-E., Palli, A., and Sinisalo, A., 1998, GPR investigation of glaciers and sea ice in the Scandinavian Arctic: GPR98–7th International Conference on Ground-Penetrating Radar Proceedings, 143–148.
14 Dowdeswell, J. A., and Evans, S., 2004, Investigations of the form and flow of ice sheets and glaciers using radio-echo sounding: Reports on Progress in Physics, 67, 1821–1861. doi:10.1088/0034-4885/67/10/R03
15 Macheret, Y. Y., Moskalevsky, M. Y., Simões, J. C., and Ladouch, L., 1997, Radio-echo sounding of King George Island ice cap, South Shetland Islands, Antarctica: Master Glyatsiol Issled, 83, 121–128.
16 Pfender, M., 1999, Topographie und Glazialhydrologie von King George Island, Antarktis: Munster, Westfalischen Wilhelms-Universitat Munster (Diplomarbeit im Fach Geophysik).
17 Carroll, P., 1972, Signature deconvolution for marine seismic reflection surveys: CSEG Journal, 8, 41–53.
18 Xia, J., Franseen, E. K., Miller, R. D., and Weis, T. V., 2004, Application of deterministic deconvolution of ground-penetrating radar data in a study of carbonate strata: Journal of Applied Geophysics, 56, 213–229.
19 Yilmaz, O., 1987, Seismic data processing: Society of Exploration Geophysicists, Tulsa.
20 Glen, J. W., and Paren, J. G., 1975, The electrical properties of snow and ice: Journal of Glaciology, 15, 15–37.
21 Lee, J. I., Hur, S. D., Yoo, C. M., Yeo, J. P., Kim, H., et al., 2002, Geologic map of Barton and Weaver Peninsulas, King George Island, Antarctica (1 : 10 000): Korea Ocean Research and Development Institute, Ansan.
22 Braun, M., Simoes, J. C., Vogt, S., Bremer, U. F., Saurer, H., Aquino, F. E., and Ferron, F. A., 2004, Anewsatellite imagemap for King George Island, Antarctica: Pesquisa Antarctica Brasileira, 4, 199–203.
23 Chen, J., and Schuster, G. T., 1999, Resolution limits of migration images: Geophysics, 64, 1046–1053. doi:10.1190/1.1444612
24 Macheret, Y. Y., and Moskalevsky, M. Y., 1999, Study of Lange Glacier on King George Island, Antarctica: Annals of Glaciology, 29, 202–206. doi:10.3189/172756499781820941
25 Macheret, Y. Y., Moskalevsky, M. Y., and Vasilenko, E. V., 1993, Velocity of radio waves in glaciers as an indicator of their hydrothermal state, structure and regime: Journal of Glaciology, 39, 373–384.
26 Jones, I. F., and Levy, S., 1987, Signal-to-noise ratio enhancement in multichannel seismic data via the Karhunen-Loeve transform: Geophysical Prospecting, 35, 12–32. doi:10.1111/j.1365-2478.1987. tb00800.x