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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.
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.
For smaller volcanoes that have erupted at least 1 km 3 (0.24 cu mi) of tephra at a time, see Category:VEI-5 volcanoes. For larger volcanoes that have erupted at least 100 km 3 (24 cu mi) of tephra at a time, see Category:VEI-7 volcanoes.
VEI Start date End date Activity area Eruption name 0 November 27, 2022 () December 13, 2022: Mokuʻāweoweo and Northeast Rift Zone: 2022 eruption of Mauna Loa: 0 March 25, 1984 () April 15, 1984 () Mokuʻāweoweo, Southwest and Northeast rift zones: 1984 eruption of Mauna Loa: 0 July 5, 1975 ()
VEI-7 volcanoes (4 C, 50 P) VEI-8 volcanoes (3 C, 20 P) This page was last edited on 23 August 2023, at 19:04 (UTC). Text is available under the Creative ...
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 ...
A supervolcano is a volcano that has had an eruption with a volcanic explosivity index (VEI) of 8, [1] the largest recorded value on the index. This means the volume of deposits for such an eruption is greater than 1,000 cubic kilometers (240 cubic miles). [2] Location of Yellowstone hotspot over time.
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 ...