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Volcanic explosivity index. The volcanic explosivity index ( VEI) is a relative measure of the explosiveness of volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982. Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle ...
In volcanology, an explosive eruption is a volcanic eruption of the most violent type. A notable example is the 1980 eruption of Mount St. Helens. Such eruptions result when sufficient gas has dissolved under pressure within a viscous magma such that expelled lava violently froths into volcanic ash when pressure is suddenly lowered at the vent.
Mauna Loa's eruption was captured by the Operational Land Imager-2 (OLI-2) on December 2. The 2022 eruption of Mauna Loa was an episode of eruptive volcanic activity at Mauna Loa, the world's largest active volcano, located on Hawaiʻi island, Hawaiʻi. Mauna Loa began to erupt shortly before midnight HST on November 27, 2022, when lava flows ...
Subglacial eruption: 1 water vapor cloud, 2 lake, 3 ice, 4 layers of lava and ash, 5 strata, 6 pillow lava, 7 magma conduit, 8 magma chamber, 9 dike Lava domes at Mount St. Helens and a "runaway glacier" Explosive subglacial eruption of Mount Redoubt, Alaska Subglacial lava dome extrusion at Mount Redoubt, Alaska
74000351. Added to NRHP. August 7, 1974 [1] The 1790 Footprints refer to a set of footprints found near the Kīlauea volcano in present-day Hawaii Volcanoes National Park on the island of Hawaiʻi. Resulting from an unusually explosive eruption, they may be associated with a series of battles in the area in 1790.
The initial explosive event was possibly more powerful than the Hatepe eruption, even though Hatepe ejected over ten times the volume of material in a longer eruption. Hunga Tonga–Hunga Haʻapai erupted over a span of 12 hours, releasing 1.9 km 3 (0.46 cu mi) of ejecta with an estimated mass of 2,900 teragrams .
An eruption column or eruption plume is a cloud of super-heated ash and tephra suspended in gases emitted during an explosive volcanic eruption. The volcanic materials form a vertical column or plume that may rise many kilometers into the air above the vent of the volcano. In the most explosive eruptions, the eruption column may rise over 40 km ...
