Item: The influence of seismic effect on avalanche release
Title: The influence of seismic effect on avalanche release
Proceedings: Proceedings of the 2000 International Snow Science Workshop, October 1-6, Big Sky, Montana
Authors: Evgueni Mokrov, Pavel Chernouss, Yuri Fedorenk, Eystein Husebye, Center of Avalanche Safety of "Apatit", lnstitute of Ecology, Kola Science Centre of Russian Academy of Science, Institute Solid Earth Physics, University of Bergen
Abstract: The mines in the Khibiny Mountains produce many chemical explosions, which occasionally are tied to explosive charges exceeding 100 tons. Such explosions have the potential of a sudden avalanche releases in avalanche prone valleys in the Khibiny. It is known that a ground of shaking earthquakes have triggered avalanches although this phenomenon has been neither quantified nor well documented yet. In 1999 a joint project to study the influences of seismic loading an avalanche release was initiated by the Center of Avalanche Safety of 'Apatit" JSC, Kola Science Center, Russian Academy of Science and the University of Bergen. Studies of archive data on avalanche releases for twenty years show that the distribution of avalanche occurrences over day of weeks are sharply non-uniform as confirmed by chi-square statistical test. The shape of these distributions is very similar to those of explosions. The attempts to study the explosions influence an avalanche release by statistical methods are described. In order to monitor the seismic events a seismic station (Nansen Kola Seismic Station) was installed at the snow and avalanche field stations on the top of the mountain plateau in a distance of a few kilometers from main places of explosions. It is planned to use some portable stations for the measurements on avalanche dangerous slopes. The program of the future studies is presented.
Keywords: avalanche release, seismic effect, chemical explosions, seismic station
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