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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.
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)
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.
For smaller volcanic eruptions that have produced at least 10 km 3 (2.4 cu mi) of tephra at a time, see Category:VEI-6 eruptions. For larger volcanic eruptions that have produced at least 1,000 km 3 (240 cu mi) of tephra at a time, see Category:VEI-8 eruptions.
Existence as a single volcano is controversial. Possibly a volcanic chain. 8 Guarapuava-Tamarana-Sarusas: Paraná and Etendeka traps: Unknown 132 Existence as a single volcano is controversial. Possibly a volcanic chain. 8 Santa Maria Fria Paraná and Etendeka traps: Unknown 132 Existence as a single volcano is controversial.
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 ...
Volcanic eruptions that rated 5 on the volcanic explosivity index. Such eruptions release a tephra volume of at least 1 km 3 (0.24 cu mi) with immediate exceptional effects on the surrounding area. For smaller volcanic eruptions that have produced at least 0.1 km 3 (0.024 cu mi) of tephra at a time, see Category:VEI-4 eruptions.
The Nakamachineshiri crater of Meakan volcano was formed during a major eruption about 13,500 years ago. The Me-Akan group of nine overlapping cones on the eastern side of Lake Akan has had mild eruptions since the beginning of the 19th century. [5] The last eruption of this historical volcano was in 2008. [3]