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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.
The ash cloud produced by the eruption, as seen from the village of Toledo, Washington, 35 mi (56 km) to the northwest of Mount St. Helens: The cloud was roughly 40 mi (64 km) wide and 15 mi (24 km; 79,000 ft) high. Ash cloud from Mt. St. Helens as captured by the GOES 3 weather satellite at 15:45 UTC.
Mount Hood, the nearest major volcanic peak in Oregon, is 60 miles (100 km) southeast of Mount St. Helens. Mount St. Helens is geologically young compared with the other major Cascade volcanoes. It formed only within the past 40,000 years, and the summit cone present before its 1980 eruption began rising about 2,200 years ago. [ 11 ]
Mount Pinatubo Luzon Volcanic Arc 25 81 Inararo Tuff 6 Etna: Campanian volcanic arc: 10 82.8 X4; I-7 7 Lago de Atitlán Central America Volcanic Arc, Guatemala 300 84 Los Chocoyos eruption 6 Kuttara Hokkaidō: 16.8 DRE 84 Kt-6 6 Kussharo Hokkaidō: 25 85 Kp-2/3 6 Kuttara Hokkaidō: 10.8 DRE 84 - 87 Kt-7 7-8 Mount Aso: Kyūshū
VEI Products Notes Pinatubo, island of Luzon, Philippines: 1991, Jun 15: 6: 6 to 16 km 3 (1.4 to 3.8 cu mi) of tephra [2] an estimated 20 million tons of sulfur dioxide were emitted [17] Mount St. Helens, Washington state, USA: 1980, May 18: 5: 1 to 1.1 km 3 (0.2 to 0.3 cu mi) of tephra: Novarupta, Alaska Peninsula: 1912, Jun 6: 6
Mount St. Helens, once the fifth-tallest peak in Washington State, lost about 1,300 feet from its height of 9,677, according to the USGS. The highest part of the crater rim on the southwestern ...
VEI Volcano Country Year Fatalities Notes 5 Mount St. Helens [21] Washington, United States 1800 4 Witori [99] Papua New Guinea 1800 4 Mount Westdahl [100] Alaska, United States 1795 4 San Martin Tuxtla [101] Mexico 1793 4 Kilauea [102] Hawaii, United States 1790 400+ Keanakakoi eruption: 4 Mount Etna [103] Italy 1787 4 Laki [65] Iceland 1783 ...
A conifer forest will return to Mount St. Helens in its own time. On a debris-avalanche deposit totally devoid of life after May 18, 1980, plants are slowly taking hold of the landscape. The study ...