Advertisement

pure and applied geophysics

, Volume 115, Issue 4, pp 989–998 | Cite as

Gravity profiling as a technique for determining the thickness of glacier ice

  • E. Klingele
  • H. -G. Kahle
Article

Summary

Detailed gravity measurements recently carried out on the Gorner glacier, Switzerland, are used to determine the variation of thickness across the glacier ice. The Gorner glacier was chosen as a test site because seismic control was available. The glacier ice at a profile near the Monte Rosa massif is associated with a relative gravity low of about −23 mgal. Model oalculations yield a corresponding ice thickness of about 400 m at the central part of the profile. A comparison of the derived residual gravity anomaly with the calculated effect of the 3-D ice model based on seismic information is made. It is shown that the regional field determined for the Gorner glacier is appropriate and gives the correct residual anomaly associated with the glacier ice. Therefore, the proposed gravity technique for determining variations of the thickness of glacier ice appears to be a valuable and rather inexpensive method for surveying glaciers.

Key words

Gravity profiling over glacier ice Glacier ice, thickness by gravity 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bearth, P. Erläuterungen zum Blatt 535 Zermatt (Atlasblatt 29) im Geologischen Atlas der Schweiz 1:25'000; (ed A. Buxtorf Schweizerische Geologische Kommission), (Kummerly & Frey AG, Geographischer Verlag, Bern 1953), 27 pp. + 1 geological chart.Google Scholar
  2. Echevin, M. (1970),Prospection Gravimétrique du Glacier d'Arsine, Ph. D. thesis, University of Grenoble, 65 pp., Laboratoire de Glaciologie due C.N.R.S., Publication No. 127.Google Scholar
  3. Kahle, H.-G. (1969),Abschätzung der Störungsmasse im Nördlinger Ries. Z. Geophysik35, 317–345.Google Scholar
  4. Kahle, H.-G., Klingele, E. andMueller, St. (1975),Zur Bedeutung der Schwerereduktion bei der Bestimmung der Figur und Massenverteilung der Erde. Schweiz. Z. für Vermessung, Photogrammetrie und Kulturtechnik3/4, 157–162.Google Scholar
  5. Klingele, E. Contribution à l'étude gravimétrique de la Suisse Romande et des régions avoisinantes. Beiträge zur Geologie der Schweiz, Serie Geophysik, Nr. 15. Kümmerly & Frey, Bern (1972), 94 pp.Google Scholar
  6. Littlewood, C. A. (1952),Gravity measurements on the Barnes Icecap, Baffin Island. J. Arctic Inst. N. Am.5, 118–124.Google Scholar
  7. Lliboutry, L. Traité de Glaciologie, Tome II (Masson & Cie, Paris 1965).Google Scholar
  8. Miller, H. (1968),Refraktions-Seismik im Sommer 1966 auf dem Vernagtferner in den Oetztaler Alpen, Diploma-Thesis, Univ. München.Google Scholar
  9. Miller, H. (1971),Untersuchungen auf dem Guslar- und Vernagtferner in den Oetztaler Alpen mit der Methode der Refraktions-Seismik und einer Vierpunkt-Methode der Geoelektrik, Ph. D. Thesis, Univ. München, 101 pp.Google Scholar
  10. Miller, H. (1972),Ergebnisse von Messungen mit der Methode der Refraktions-Seismik auf dem Vernagtund Guslarferner, Z. für Gletscherkunde und Glazialgeologie.7, 27–41.Google Scholar
  11. Mothes, H. (1927),Seismische Dickenmessungen von Gletschereis, Z. Geophysik3, 121–134.Google Scholar
  12. Plouff, D. (1966),Digital terrain corrections based on geographic coordinates, Abstract, 36th meeting of the Society of Exploration Geophysicists.Google Scholar
  13. Rampton, V. N. andWalcott, R. J. (1974),Gravity profiles across ice-cored topography. Canad. J. Earth Sci.11, 110–122.Google Scholar
  14. Roethlisberger, H. (1967),Electrical resistivity measurements and soundings on glaciers: introductory remarks, J. Glaciology6, 599–606.Google Scholar
  15. Roethlisberger, H. andVoegtli, K. (1967),Recent DC resistivity soundings on Swiss glaciers, J. Glaciology6, 607–621.Google Scholar
  16. Roethlisberger, H. (1972),Seismic Exploration in Cold Regions. Cold Regions Science and Engineering, Monograph II-A2a, Hanover, New Hampshire.Google Scholar
  17. Sorge, E. (1930),Die ersten Dickenmessungen des grönländischen Inlandeises, Z. Geophysik6, 22–31.Google Scholar
  18. Suesstrunk, A. (1951),Sondage du glacier par la méthode seismique (Sub-surface glacier investigations: seismic soundings), La Houille Blanche6, 309–317.Google Scholar
  19. Voegtli, K. (1967),D. C. Resistivity soundings on Devon Island, N.W.T., Canad. J. Glaciology6, 635–642.Google Scholar
  20. Weber, J. R. (1960),Comparison of gravitational and seismic depth determinations on the Gilman glacier and adjoining ice gap in northern Ellesmere Island, Defence Research Board, Department of National Defence, Canada, June 1960, Ottawa, Canada, 12 pp.Google Scholar

Copyright information

© Birkhäuser Verlag 1977

Authors and Affiliations

  • E. Klingele
  • H. -G. Kahle
    • 1
  1. 1.Institut für GeophysikETH-HönggerbergZurichSwitzerland

Personalised recommendations