A computer simulation found that some avalanches are caused by snow fracturing in a way similar to how fault planes slide in earthquakes
Avalanches may happen when layers of snow crack and slide in a way similar to a type of earthquake. The computer simulation that uncovered this connection could lead to more precise methods of avalanche forecasting.happen from “slab avalanches”, which begin with a slab of snow sliding down a mountain. This is set off by the snow fracturing at speeds of more than 300 kilometres per hour. However, exactly how this speed is reached was unclear.
at the Swiss Federal Institute of Technology in Lausanne and his colleagues have now run hundreds of day-long computer simulations that modelled large volumes of snow to uncover how these fast fractures come about.The team found that in the build-up to an avalanche, a layer of weak, porous snow collapses underneath a harder slab. This causes the harder slab to begin sliding down the mountain. Initially, it fractures and moves slowly.
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