On April 12, 1981, an ice that is as big as houses slided down from the top of the glacier on Sanfo volcano in Alaska, falling on the snowbank, which caused millions of tons of snowballs to roll down quickly and destroy 13-kilometer area all along the way.
According to concerned experts, the avalanche produced powder snow cloud of 160 km length, which was by far one of the worst on record. In fact, once the natural monster that can engulf the entire city began into action with high speed of 400 kilometers, we can only submit to arrest with folded arms.
People who know avalanches should know, in fact, in an avalanche, blast ahead of avalanche is more terrible than the avalanche itself. Because the avalanche moved down with great potential energy, For example, from 6000-meter Mountain, which will cause the violent vibration of the air and thus, blast will be formed extremely fast.
This kind of wave is similar to the shock wave produced by the atomic bomb. The flow of snow drives the waves in front of it, and the impact of this wave is more dangerous than that of the snowdrift itself. Where there is the blast, there are wind blows, damaged houses, disappearance of trees, and suffocative people. So sometimes the avalanche itself does not arrive while the blast has turned all the obstacles on the way. In a massive avalanche in Peru in 1970, the avalanche body streaked 14.5 km in less than 3 minutes, with the speed closing to 90 m/s, which is more than 32.5 m/s of typhoons of 12 levels. The blast caused by avalanche swept the rock debris across the heavens, forming “stone rain”.
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