Seismic and impact-pressure monitoring of flowing avalanches

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Journal titleJournal of Glaciology
Pages179187; # of pages: 9
SubjectEarthquakes; avalanches; snow (snowfall); seismic loads; impact loads; avalanche; neige (precipitation); charge sismique; force d'impact
AbstractContinuous records have been made during the passage of dry- snow avalanches of both seismic signals, which allows the avalanche speed to be estimated, and impact pressures on load cells with surface areas of 645 and 6450 mm[2]. The impact-pressure recordings show an initial peak followed by a base pressure. The observed initial and base pressures vary strongly within avalanches and from one avalanche to another, but, on average, they can be correlated with the frontal speed and the density of the deposited avalanche snow. It is concluded that well-developed dry-snow avalanches have an unsteady wave motion similar to the slug flow observed in ultra-rapid flow of water, and that they consist of three stratified components: dense flowing snow at the bottom, light flowing snow, and powder snow.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number19275
NPARC number20358598
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Record identifier56e77616-9c28-4979-a871-5c8e05d790cd
Record created2012-07-20
Record modified2016-05-09
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