<p class="p1">A 5.1 magnitude earthquake shakes the ground underneath Mount St. Helens in Washington State. The quake sets off a landslide and the entire north slope of the volcano slides away exposing the core of the volcano, triggering the massive and devastating eruption On This Day in 1980.</p>

A 5.1 magnitude earthquake shakes the ground underneath Mount St. Helens in Washington State. The quake sets off a landslide and the entire north slope of the volcano slides away exposing the core of the volcano, triggering the massive and devastating eruption On This Day in 1980.

<p>A 5.1 magnitude earthquake shakes the ground underneath Mount St. Helens in Washington State. The quake sets off a landslide and the entire north slope of the volcano slides away exposing the core of the volcano, triggering the massive and devastating eruption On This Day in 1980.</p>

May 18th - The volcanic eruption of Mount St. Helens

A daily time capsule of stories of the significant, intriguing or just plain forgotten events of history that all occurred on this day.

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May 18th - The volcanic eruption of Mount St. Helens

May 18th - The volcanic eruption of Mount St. Helens