1887
Volume 41, Issue 1
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

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, 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.

ASEG
Loading

Article metrics loading...

/content/journals/10.1071/EG09052
2010-03-01
2026-01-14

  • From This Site

    /content/journals/10.1071/EG09052
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Braun M. Simões J. C. Vogt S. Bremer U. F. Saurer H. Aquino F. E. Ferron F. A. 2004 A new satellite image map for King George Island, Antarctica: Pesquisa Antarctica Brasileira 4 199 203
    [Google Scholar]
  2. Carroll P. 1972 Signature deconvolution for marine seismic reflection surveys: CSEG Journal 8 41 53
    [Google Scholar]
  3. Chen J. Schuster G. T. 1999 Resolution limits of migration images: Geophysics 64 1046 1053 doi:10.1190/1.1444612
    [Google Scholar]
  4. Claerbout J. F. 1985, Imaging the earth’s interior: Blackwell Scientific Publications.
  5. Dowdeswell J. A. 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
    [Google Scholar]
  6. Glen J. W. Paren J. G. 1975 The electrical properties of snow and ice: Journal of Glaciology 15 15 37
    [Google Scholar]
  7. Irvine-Fynn T. D. Moorman B. J. Williams J. L. M. 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
    [Google Scholar]
  8. Jezek K. C. 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
    [Google Scholar]
  9. Jones I. F. 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
    [Google Scholar]
  10. Kim K. Y. Hong M. H. Shon H. Lee J. H. 2006 Enhancement of vertical resolution of GPR data though signature deconvolution: Journal of Korean Geophysicists Society 9 1 6
    [Google Scholar]
  11. Kim K. Y. Lee J. Hong M. H. Hong J. K. Jin Y. G. Shon H. 2010 Seismic and Radar Investigations of the Fourcade Glacier on King George Island, Antartica: Polar Research
    [Google Scholar]
  12. 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.
  13. Macheret Y. Y. Moskalevsky M. Y. 1999 Study of Lange Glacier on King George Island, Antarctica: Annals of Glaciology 29 202 206 doi:10.3189/172756499781820941
    [Google Scholar]
  14. Macheret Y. Y. Moskalevsky M. Y. 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
    [Google Scholar]
  15. Macheret Y. Y. Moskalevsky M. Y. Simões J. C. Ladouch L. 1997 Radio-echo sounding of King George Island ice cap, South Shetland Islands, Antarctica: Master Glyatsiol Issled 83 121 128
    [Google Scholar]
  16. 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.
  17. Moran M. L. Greenfield G. J. Arcone S. A. 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
    [Google Scholar]
  18. Murray T. Stuart G. W. Fry M. Gamble N. H. 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
    [Google Scholar]
  19. Pfender M. 1999, Topographie und Glazialhydrologie von King George Island, Antarktis: Münster, Westfälischen Wilhelms-Universität Münster (Diplomarbeit im Fach Geophysik).
  20. 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
    [Google Scholar]
  21. Simões J. C. Goßmann H. Delmas R. J. Moskalevsky M. Y. 2004 Glaciological research in King George Island: Missions and developments in the 1990s: Pesquisa Antarctica Brasileira 4 1 4
    [Google Scholar]
  22. Stolt R. H. 1978 Migration by Fourier transform: Geophysics 43 23 48 doi:10.1190/1.1440826
    [Google Scholar]
  23. Travassos J. M. Simões 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
    [Google Scholar]
  24. Xia J. Franseen E. K. Miller R. D. 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
    [Google Scholar]
  25. Yilmaz Ö. 1987, Seismic data processing: Society of Exploration Geophysicists, Tulsa.
  26. Ziolkowski A. 1991 Why don’t we measure seismic signatures?: Geophysics 56 190 201 doi:10.1190/1.1443031
    [Google Scholar]
/content/journals/10.1071/EG09052
Loading
Helicopter-borne and ground-towed radar surveys of the Fourcade Glacier on King George Island, Antarctica
Exploration Geophysics 41, 51 (2010); https://doi.org/10.1071/EG09052
/content/journals/10.1071/EG09052
/content/journals/10.1071/EG09052
Loading

Data & Media loading...

  • Article Type: Research Article
Keyword(s): Fourcade Glaciers, helicopter-borne and ground-towed GPR, internal features, subglacial topography.

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error