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The world's largest recorded avalanche occurred on May 18, 1980 when Mount St. Helens erupted.

A few facts:

* The eruption had the energy of 1000 Hiroshima-sized bombs

* It resulted 2/3 a cubic mile of the north slope sliding down into the valley at over 150 miles per hour. * Debris deposits as deep as 600 feet and as far away as 15 miles

* The adjacent 23 square mile valley was covered with an average of 150 feet of debris.

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