After approximately 123 years of lying dormant, several small earthquakes were recorded in Mid-March of 1980. These small quakes were followed by an earthquake with a magnitude of 4.2 (Richter scale) on March 20, at 3:47 p.m. PST (History - Mt. St. Helens, 2014). Multiple quakes were recorded in the days that followed causing small avalanches of ice and snow. However, the mountain showed no signs of eruption. It is unclear if it was one explosion or two nearly coinciding ones that were heard throughout the region at approximately 12:36 p.m. PST on March 27th. At that time, the mountain began to emit steam and ash into the air. These initial explosions created a 250-foot-wide crater within the larger establ...
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...onomy of the Cascade Mountain Range.
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