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Effects of triggering mechanism on snow avalanche slope angles and slab depths from field data

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  • D. McClung

Abstract

Field data from snow avalanche fracture lines for slope angle and slab depth (measured perpendicular to the weak layer) were analyzed for different triggering mechanisms. For slope angle, the results showed that the same probability density function (pdf) (of log-logistic type) and range (25°–55°) apply independent of triggering mechanism. For slab depth, the same pdf (generalized extreme value) applies independent of triggering mechanism. For both slope angle and slab depth, the data skewness differentiated between triggering mechanism and increased with applied triggering load. For slope angle, skewness is lowest for natural triggering by snow loads and highest for triggering from human intervention. For slab depth, the skewness is lowest for natural triggering and highest for a mix of triggers including explosive control with skier triggering being intermediate. The results reveal the effects of triggering mechanism which are important for risk analyses and to guide avalanche forecasting. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • D. McClung, 2013. "Effects of triggering mechanism on snow avalanche slope angles and slab depths from field data," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 69(3), pages 1721-1731, December.
    • Handle: RePEc:spr:nathaz:v:69:y:2013:i:3:p:1721-1731
    DOI: 10.1007/s11069-013-0771-2
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    Cited by:

    1. D. McClung, 2014. "Risk analyses for dry snow slab avalanches released by skier triggering," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 72(2), pages 1139-1158, June.

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