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A small phreatic eruption occurred at Mount St. Helens in the spring of 1980, prior to the catastrophic eruption on May 18, 1980. The phreatic event released steam and volcanic gases.
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A small phreatic eruption occurred at Mount St. He...

Eruption of the volcano Mount St Helens, which became the epicenter of an earthquake measuring 5.1 on the Richter scale, May 18, 1980. Image courtesy CDC.
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Eruption of the volcano Mount St Helens, which bec...

Mount St. Helens erupted often between 1980 and 1986. An explosive eruption on March 19, 1982, sent pumice and ash 9 miles (14 kilometers) into the air, and resulted in a lahar (the dark deposit on th...
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Mount St. Helens erupted often between 1980 and 19...

Giant plumes of volcanic ash pour from Mount St. Helens on the day of its major eruption, May 18, 1980.
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Giant plumes of volcanic ash pour from Mount St. H...

An aerial view of Mount St. Helens from the north, captured on February 25, 2005. The volcano is a prominent geological feature, known for its eruption in 1980 and ongoing volcanic activity.
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An aerial view of Mount St. Helens from the north,...

View from Johnston Ridge six miles northwest of Mount St. Helens volcanic one day before eruption May 17, 1980 in Washington State. The volcano suffered a catastrophic eruption on May 18, 1980.
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View from Johnston Ridge six miles northwest of Mo...

Ash covered street in Eastern Washington State after the 1980 volcanic eruption of Mount St. Helens
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Ash covered street in Eastern Washington State aft...