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The volcanic explosivity index (VEI) is a scale used to measure the size of explosive volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982.
Hike via south slope of volcano (closest area near eruption site) Mount St. Helens (known as Lawetlat'la to the local Cowlitz people , and Loowit or Louwala-Clough to the Klickitat ) is an active stratovolcano located in Skamania County, Washington , [ 1 ] in the Pacific Northwest region of the United States.
In its recent history though, Katla has been less active as the last major eruption occurred in 1918. These eruptions have had a Volcanic Explosivity Index (VEI) of between 4 and 5 on a scale of 0 to 8. In comparison, the Eyjafjallajökull 2010 eruption had a VEI of 4. Larger VEI-5 eruptions are comparable to Mount St. Helens 1980 eruption ...
For smaller volcanic eruptions that have produced at least 1 km 3 (0.24 cu mi) of tephra at a time, see Category:VEI-5 eruptions. For larger volcanic eruptions that have produced at least 100 km 3 (24 cu mi) of tephra at a time, see Category:VEI-7 eruptions.
While there were other eruptions in 1815, Tambora is classified as a VEI-7 eruption with a column 45 km (148,000 ft) tall, eclipsing all others by at least one order of magnitude. The VEI is used to quantify the amount of ejected material, with a VEI-7 being 100 km 3 (24 cu mi). Every index value below that is one order of magnitude (meaning ...
Category: Volcanoes by highest known Volcanic Explosivity Index of eruption. ... VEI-2 volcanoes (11 P) VEI-3 volcanoes (1 C, 12 P) VEI-4 volcanoes (2 C, 39 P)
In the continental U.S., the most recent cataclysmic eruption of a volcano was Mount St. Helens on May 18, 1980. “Vancouver, Vancouver, this is it!” radioed U.S. Geological Survey scientist ...
For larger volcanoes that have erupted at least 1,000 km 3 (240 cu mi) of tephra at a time, see Category:VEI-8 volcanoes or Category:Supervolcanoes. The only unambiguous VEI-7 eruption to have been directly observed in recorded history was Mount Tambora in 1815 and caused the Year Without a Summer in 1816.