Abstract
The recording of glacier icequakes has been carried out on the Hans glacier, Spitsbergen. The icequakes have been connected with the formation of open cracks. The energy of the main group of icequakes has ranged from 0.01 J to 6 J, their seismic moment being from 0.5 · 1014 dyne · cm to 26 · 1014 dyne · cm. The nonelastic volume increase corresponding to each crack has ranged from 0.2 · 10−2 m3 to 8.8 · 10−2 m3. The stresses released due to extensional faulting ranged from 25N/m2 to 500 N/m2; these values are so small that they suggest an incomplete release of the medium. The contribution into the glacier flow rate of the deformation in the surface glacier layer due to extensional faulting is lower by 2 to 3 orders of magnitude than the total plastic deformation associated with the ice creeping.
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References
Baranowski, S. (1977),Subpolarne lodowce Spitsbergenu na tle klimatu tego regionu, Acta Univ. Wratislav, 393, Studia Geograficzne XXXI, Wrocław.
Cichowicz, A (1984),Mean stresses in the upper layer of a glacier and their relation to seismicity, Acta Geophysica Polonica (in press).
Czajkowski, R (1980),Radar measurements of thickness of “Warm” glaciers, Pol. Polar Res.4, 21–41.
Gibowicz, S. J. (1975),Variation of source properties: The Inangahua, New Zealand, aftershocks of 1968, Bull. Seismol. Soc. Am.65, 261–276.
Górski, M., andNiewiadomski, J. (1982),Seismological station of the Institute of Geophysics Polish Academy of Sciences, in the Hornsund Fiord, Spitsbergen, Acta Geophysica Polonica30, no. 3.
Gutenberg, B., andRichter, C. F. (1956),Earthquake magnitude, intensity, energy and acceleration, Bull. Seismol. Soc. Am.46, 105–45.
Hutter, K., andOlunloyo, V. O. S. (1980),On the distribution of stress and velocity in an ice strip, which is partly sliding over and partly adhering to its bed, by using a Newtonian viscous approximation, Proc. R. Soc. Lond. A373, 385–403.
Kostrov, B. V. (1970),The theory of the focus for tectonic earthquakes, Izvest. Akad. Nauk SSSR, Solid Earth Physics4, 84–101.
Neave, K. G., andSavage, J. C. (1970),Icequakes on the Athabasca Glacier, J. Geophys. Res.75, 1351–1362.
Nye, J. F. (1957),The distribution of stress and velocity in glacier and ice-sheets, Proc. R. Soc. Lond. A239, 113–133.
Paterson, W. S. B. The Physics of Glaciers. Oxford, New York, Toronto, Sydney, Paris, Frankfurt: Pergamon, 1981.
Pekeris, C. L., Alterman, Z., Abramovici, F., andJarosch, H. (1965),Propagation of a compressional pulse in a layered solid, Rev. Geophys.3, 25–47.
Pilant, W. L.,Elastic Waves in the Earth, Amsterdam: Elsevier, 1979.
Sato, T. (1978),A note on body wave radiation from expanding tension crack, Sci. Rep. Tohoku Univ., Ser. 5, Geophysics25, 1–10.
Savage, J. C., andMansinha, L. (1963),Radiation from a tensile fracture, J. Geophys. Res.,68, 6345–6358.
Teisseyre, R. (1977),Dislocation processes and formation of tensile cracks in glaciers, Acta Geophys. Pol.25, no. 2.
Teisseyre, R. (1978),Relation between the defect distribution and stresses. The glacier motion, Acta Geophys. Pol.26, no. 4.
van Wormer, D., andBerg, E. (1973),Seismic evidence for glacier motion. J. Glaciol.12, 259–265.
Weaver, S., andMalone, D. (1979),Seismic evidence for discrete glacier motion at the rock-ice interface, J. Glaciol.23, 171–183.
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Cichowicz, A. Icequakes and glacier motion: The hans glacier, spitsbergen. PAGEOPH 121, 27–38 (1983). https://doi.org/10.1007/BF02590118
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DOI: https://doi.org/10.1007/BF02590118