Slab edit avalanches [].Slab avalanches form frequently in snow that has been deposited or redeposited, by wind. They have the characteristic appearance. Of a block (slab) of snow cut out from its surroundings by fractures. Elements of slab avalanches include the following:? A crown fracture at the top of the start zone flank fractures, on the sides of the start zones and a, fracture at the bottom. Called the staunchwall. The crown and flank fractures are vertical walls in the snow delineating the snow that was entrained. In the avalanche from the snow that remained on the slope. Slabs can vary in thickness from a few centimetres to three, metres. Slab avalanches account for around 90% of avalanche-related fatalities in backcountry users.
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