slab avalanche
Quick Summary
A slab avalanche is a type of avalanche where a cohesive mass of snow breaks loose and rapidly descends a slope. These avalanches can reach speeds of up to 130 km (80 miles) per hour and have the power to destroy forests and villages.1
Slab avalanches typically occur on slopes between 30 and 50 degrees. Factors influencing their occurrence include mountainous terrain, weather conditions, the state of the snowpack, and a trigger. Terrain features like slope shape, exposure to sun and wind, and elevation can increase or decrease avalanche probability. Heavy snowfall and strong winds are common conditions associated with slab avalanches, as they can overload the existing snowpack or create bonded slabs of snow.12
While loud noises do not trigger avalanches, triggers can include new snowfall, wind-deposited snow, or human activity like skiing or snowmobiling.1
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