mt st helen's last major eruption occurred on may 18, 1980.
mt st helen's last major eruption occurred on may 18, 1980.
when did mt st helen's last major eruption occur?
may 18, 1980
the 57-year eruptive period that started in 1800 was named after the goat rocks dome, and is the first time that both oral and written records exist. like the kalama period, the goat rocks period started with an explosion of dacite tephra, followed by an andesite lava flow, and culminated with the emplacement of a dacite dome. the 1800 eruption probably rivalled the 1980 eruption in size, although it did not result in massive destruction of the cone. the ash drifted northeast over central and eastern washington, northern idaho, and western montana. there were at least a dozen reported small eruptions of ash from 1831 to 1857, including a fairly large one in 1842. the vent was apparently at or near goat rocks on the northeast flank. goat rocks dome was the site of the bulge in the 1980 eruption, and it was obliterated in the major eruption event on may 18, 1980 that destroyed the entire north face and top of the mountain.
mount st. helens
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