Item: Deep slab instability
Title: Deep slab instability
Proceedings: Proceedings of the 1976 International Snow Science Workshop, Banff, Alberta
Authors: N.A. Wilson
Abstract: Deep slab release continue to claim victims. The best documented of these releases occur in ski area and highway situations where the deep instability is often anticipated by avalanche workers who must attempt to control the suspect avalanche slopes. The majority of deep slab (climax) avalanches involve a layer of temperature gradient snow and/or other major discontinuities within the snowpack. The explosive test remains our single best method of testing for instability, but the test provided by explosives cannot be considered conclusive under all weather and snow conditions. The questions, then, are: When can the explosive test be relied on? When is the test suspect? Beyond the basic explosive test, what additional test or control measures are in order, and when should these be implemented? The above are discussed in technical but non-scientific terms. Practical solutions are offered.
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Keywords: temperature gradient, deep slab, victims, explosive test
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