The day Mount St. Helens erupts – level 3
On March 15, 1980, several small earthquakes indicated that magma may have begun moving below Mount St. Helens, US.
Increasingly strong tremors alarmed geologists, and they prompted Governor Dixy Lee Ray to declare a state of emergency on April 3. On May 18, a magnitude 5.1 earthquake centered directly below the volcano triggered a part of the volcano to slide. The landslide traveled at 180 to 250 kmph and it was the largest landslide ever recorded. It filled the valley of the Toutle River with up to 180-meter-deep avalanche debris.
Explosions burst through the trailing part of the landslide and they consisted of very hot volcanic gases, ash and lava. The blast knocked down about 600 square kilometers of forest and the ash column grew to a height of 20 kilometers. The eruption killed 57 people, and it destroyed 200 houses, 27 bridges, and 300 kilometers of roads.
What were the effects of ashfall as a result of the eruption of Mount St. Helens?
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