Pyroclastic flow

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Mount St. Helens, 30 years ago - Photos - The Big Picture - Boston.com Pyroclastic Flow, Mount St Helens, Lava Flow, Active Volcano, St Helens, Pompeii, Natural Disasters, National Museum, Washington State

On May 18th, 1980, thirty years ago today, at 8:32 a.m., the ground shook beneath Mount St. Helens in Washington state as a magnitude 5.1 earthquake struck, setting off one of the largest landslides in recorded history - the entire north slope of the volcano slid away. As the land moved, it exposed the superheated core of the volcano setting off gigantic explosions and eruptions of steam, ash and rock debris. The blast was heard hundreds of miles away, the pressure wave flattened entire…

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