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Supervolcano

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]

For other uses, see Supervolcano (disambiguation).

Supervolcanoes occur when magma in the mantle rises into the crust but is unable to break through it. Pressure builds in a large and growing magma pool until the crust is unable to contain the pressure and ruptures. This can occur at hotspots (for example, Yellowstone Caldera) or at subduction zones (for example, Toba).[3][4]


Large-volume supervolcanic eruptions are also often associated with large igneous provinces, which can cover huge areas with lava and volcanic ash. These can cause long-lasting climate change (such as the triggering of a small ice age) and threaten species with extinction. The Oruanui eruption of New Zealand's Taupō Volcano (about 26,500 years ago) was the world's most recent VEI-8 eruption.[5]

Terminology[edit]

The term "supervolcano" was first used in a volcanic context in 1949.[6][note 1] Its origins lie in an early 20th-century scientific debate about the geological history and features of the Three Sisters volcanic region of Oregon in the United States. In 1925, Edwin T. Hodge suggested that a very large volcano, which he named Mount Multnomah, had existed in that region.[note 2] He believed that several peaks in the Three Sisters area were remnants of Mount Multnomah after it had been largely destroyed by violent volcanic explosions, similarly to Mount Mazama.[7] In his 1948 book The Ancient Volcanoes of Oregon, volcanologist Howel Williams ignored the possible existence of Mount Multnomah, but in 1949 another volcanologist, F. M. Byers Jr., reviewed the book, and in the review, Byers refers to Mount Multnomah as a "supervolcano".[6][8][9]


More than fifty years after Byers' review was published, the term supervolcano was popularised by the BBC popular science television program Horizon in 2000, referring to eruptions that produce extremely large amounts of ejecta.[10][11]


The term megacaldera is sometimes used for caldera supervolcanoes, such as the Blake River Megacaldera Complex in the Abitibi greenstone belt of Ontario and Quebec, Canada.[12]


Though there is no well-defined minimum explosive size for a "supervolcano", there are at least two types of volcanic eruptions that have been identified as supervolcanoes: large igneous provinces and massive eruptions.[13]

featured an episode "Mystery of the Megavolcano" in September 2006 examining such eruptions in the last 100,000 years.[39]

Nova

is the title of a British-Canadian television disaster film, first released in 2005. It tells a fictional story of a supereruption at Yellowstone.

Supervolcano

In the 2009 disaster film , a supereruption of Yellowstone is one of the events that contributes to a global cataclysm.

2012

Volcano, lake, and caldera locations in the Taupō Volcanic Zone

Volcano, lake, and caldera locations in the Taupō Volcanic Zone

 – Potentially harmful worldwide events

Global catastrophic risk

Timeline of volcanism on Earth

 – Supereruption 74,000 years ago that may have caused a global volcanic winter

Toba catastrophe theory

 – Temperature anomaly event caused by a volcanic eruption

Volcanic winter

Mason, Ben G.; Pyle, David M.; Oppenheimer, Clive (2004). "The size and frequency of the largest explosive eruptions on Earth". Bulletin of Volcanology. 66 (8): 735–748. :2004BVol...66..735M. doi:10.1007/s00445-004-0355-9. S2CID 129680497.

Bibcode

Oppenheimer, C. (2011). . Cambridge University Press. ISBN 978-0-521-64112-8.

Eruptions that shook the world

Timmreck, C.; Graf, H.-F. (2006). . Atmospheric Chemistry and Physics. 6 (1): 35–49. Bibcode:2006ACP.....6...35T. doi:10.5194/acp-6-35-2006. hdl:11858/00-001M-0000-0011-FD24-C.

"The initial dispersal and radiative forcing of a Northern Hemisphere mid-latitude super volcano: a model study"

Overview and Transcript of the original BBC program

Yellowstone Supervolcano and Map of Supervolcanoes Around The World

USGS Fact Sheet – Steam Explosions, Earthquakes, and Volcanic Eruptions – What's in Yellowstone's Future?

Scientific American's The Secrets of Supervolcanoes

BBC Science, 6 January 2014

Supervolcano eruption mystery solved