Item: Russian-norwegian project on seismicity-induced avalanches
Title: Russian-norwegian project on seismicity-induced avalanches
Proceedings: 2002 International Snow Science Workshop, Penticton, British Columbia
Authors: P. Chernouss, E. Mokrov, Center of Avalanche Safety, Apatit JSC, Kirovsk, Russia, Y. Fedorenko, Institute of Northern Ecology Problem, Kola Science Center, Russian Academy of Sciences Apatity, E. Husebye Institute Solid Earth Physics, University of B
Abstract: Sometime a direct damage of earthquake can be less than that occurs due to triggered phenomena such as landslides, avalanches, etc. It is very difficult to get information about avalanches released by earthquakes due to their rarity. The Khibini Mountains are strongly effected by artificial seismicity caused by technological explosions in the underground mines and open pits, have 7-8 months a year avalanche period and thus are an ideal place for studies of seismicity-induced avalanches. Joint Russian-Norwegian studies were started in 1999. At the first stage data on explosion and avalanche release distributions over days of week were analyzed. It has been shown that avalanche releases clearly correlated with explosions (E. Mokrov at aI., ISSW'2000). To quantify seismicity a three component seismic station was deployed on the mountain top, in a few kilometers from places of explosions and a portable seismic station is used to study seismic effects in avalanche starting zones. They register the data on accelerations, velocities, displacements and their time histories. A simple physical model was chosen to analyze of snow static stability. Known by its application to seismicity-induced landslides Newmark analysis is suggested to take into account seismic influence within a dynamical model. Some estimations of the seismicity influence on snow stability for the real explosions are presented. Some possible mechanisms of influence of seismicity and air shock wave caused by explosions on snow stability are discussed. Main directions for further studies are described.
Keywords: seismisity, snow stability, avalanche, simulation
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