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Phenomena

1980 Eruption of Mount St. Helens

Volcanology

A catastrophic explosive eruption on the morning of May 18, 1980, triggered by the largest landslide in recorded history, which unroofed the volcano's bulging north flank and released a lateral blast. It remains the most economically destructive volcanic event in United States history. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Disputed
Death Toll
About 57, with documentation uncertainty in the range of 55 to 64 depending on whether indirect deaths are counted 1
Direct blast deaths are reasonably well established; totals that add indirect fatalities vary by source.
Event Date
1980-05-18 1
Magnitude or Scale
Volcanic Explosivity Index (VEI) 5 1
Location
Skamania County, Washington, United States 1
Connections

Associated With

Volcanic Explosivity Index, Concepts

Rated Volcanic Explosivity Index 5.

Source Volcanic Explosivity Index (Wikipedia)
Volcano, Phenomena

The 1980 eruption of Mount St. Helens is among the best-documented major volcanic eruptions.

Caused By

Volcanism, Processes

Read from this phenomenon's own Wikipedia article (1980 Eruption of Mount St. Helens); earth5 pass cause judgment: Volcanism.

Source 1980 Eruption of Mount St. Helens (Wikipedia)

In Discipline

Volcanology, Disciplines
Source 1980 Eruption of Mount St. Helens (Wikipedia)
In the Other Atlases

Found In

United States

Also in Geography Atlas: where this subject is found.

Source 1980 Eruption of Mount St. Helens (Wikipedia)Lead paragraph of the cited Wikipedia article
Quote, Lead paragraph of the cited Wikipedia article
On May 18, 1980, at 8:32 a.m., Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5.
Sources
1. 1980 Eruption of Mount St. Helens (Wikipedia)
Wikimedia Foundation
  • Lead section
    On May 18, 1980, at 8:32 a.m., Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5.
  • In Group: Major Volcanic Eruptions, Lead sentence
    On May 18, 1980, at 8:32 a.m., Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5. It was the first to occur in the contiguous United States since the much smaller 1915 eruption of Lassen Peak in California.
View the Source
Volcanic Explosivity Index (Wikipedia)
Wikimedia FoundationAssociated With: Volcanic Explosivity IndexView the Source
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