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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 2, issue 3/4
Nat. Hazards Earth Syst. Sci., 2, 157–161, 2002
https://doi.org/10.5194/nhess-2-157-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Landslides and related phenomena: Avalanches

Nat. Hazards Earth Syst. Sci., 2, 157–161, 2002
https://doi.org/10.5194/nhess-2-157-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  31 Dec 2002

31 Dec 2002

Possible deviations from Griffith’s criterion in shallow slabs, and consequences on slab avalanche release

F. Louchet1, J. Faillettaz2, D. Daudon2, N. Bédouin3, E. Collet3, J. Lhuissier3, and A.-M. Portal3 F. Louchet et al.
  • 1LTPCM – UMR, CNRS 5614/INPG-UJF, B.P. 75, F-38402 St. Martin d’Hères, France
  • 2Sols, Solides, Structures, ENSHMG, B.P. 75, F-38402 St. Martin d’Hères, France
  • 3ENSEEG, B.P. 75, F-38402 St. Martin d’Hères, France

Abstract. Possible reasons for deviations from Griffith’s criterion in slab avalanche triggerings are examined. In the case of a major basal crack, we show (i) that the usual form of Griffith’s criterion is valid if elastic energy is stored in a shallow and hard slab only, and (ii) that rapid healing of broken ice bonds may lead to shear toughnesses larger than expected from tensile toughness experiments. In the case of avalanches resulting from failure of multi-cracked weak layers, where a simple Griffith’s criterion cannot be applied, frequency/size plots obtained from discrete elements and cellular automata simulations are shown to obey scale invariant power law distributions. These findings are confirmed by both frequency/acoustic emission duration and frequency/size plots obtained from field data, suggesting that avalanche triggerings may be described using the formalism of critical phenomena.

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