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What caused Mount St. Helens to erupt?

April 26, 2017caused erupt Helens mount st

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What caused Mount St. Helens to erupt?

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Huge eruptions occurred in the years 1480, 1482, and 1800, and smaller releases of steam between 1831 and 1857. The large magma chamber beneath Mount St. Helens will likely continue to force lava upward and cause future eruptions. However, as history indicates, they could be several hundred years apart.

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In 1980, the pressure below the dome of Mount Saint Helens started increasing, manifesting itself in the form of earthquakes. The pressure got to such a point it needed to be released somehow and the volcano erupted in one of the deadliest eruptions in United States history.