Timeline of volcanism on Earth
This timeline of volcanism on Earth is a list of major volcanic eruptions of approximately at least magnitude 6 on the Volcanic Explosivity Index (VEI) or equivalent sulfur dioxide emission around the Quaternary period (from 2.58 Mya to the present).
Some eruptions cooled the global climate—inducing a volcanic winter—depending on the amount of sulfur dioxide emitted and the magnitude of the eruption. Before the present Holocene epoch, the criteria are less strict because of scarce data availability, partly since later eruptions have destroyed the evidence. Only some eruptions before the Neogene period (from 23 Mya to 2.58 Mya) are listed. Known large eruptions after the Paleogene period (from 66 Mya to 23 Mya) are listed, especially those relating to the Yellowstone hotspot, the Santorini caldera, and the Taupo Volcanic Zone.
Active volcanoes such as Stromboli, Mount Etna and Kīlauea do not appear on this list, but some back-arc basin volcanoes that generated calderas do appear. Some dangerous volcanoes in "populated areas" appear many times: so Santorini, six times and Yellowstone hotspot, 21 times. The Bismarck volcanic arc, New Britain, and the Taupo Volcanic Zone, New Zealand, appear often too.
- 1 Large Quaternary eruptions
- 2 Large Neogene eruptions
- 3 Volcanism before the Neogene
- 4 Notes
- 5 See also
- 6 References
- 7 Further reading
- 8 External links
Large Quaternary eruptions
Since 1000 AD
- Pinatubo, island of Luzon, Philippines; 1991, June 15; VEI 6; 6 to 16 km3 (1.4 to 3.8 cu mi) of tephra; an estimated 20,000,000 tonnes (22,000,000 short tons) of SO
2 were emitted
- Novarupta, Alaska Peninsula; 1912, June 6; VEI 6; 13 to 15 km3 (3.1 to 3.6 cu mi) of lava
- Santa Maria, Guatemala; 1902, October 24; VEI 6; 20 km3 (4.8 cu mi) of tephra
- Krakatoa, Indonesia; 1883, August 26–27; VEI 6; 21 km3 (5.0 cu mi) of tephra
- Mount Tambora, Lesser Sunda Islands, Indonesia; 1815, Apr 10; VEI 7; 150 km3 (36 cu mi) of tephra; an estimated 200,000,000 t (220,000,000 short tons) of SO
2 were emitted, produced the "Year Without a Summer"
- 1808 mystery eruption, VEI 6–7; discovered from ice cores in the 1980s.
- Grímsvötn, Northeastern Iceland; 1783–1785; Laki; 1783–1784; VEI 6; 14 km3 (3.4 cu mi) of lava, an estimated 120,000,000 t (130,000,000 short tons) of SO
2 were emitted, produced a Volcanic winter, 1783, on the North Hemisphere.
- Long Island (Papua New Guinea), Northeast of New Guinea; 1660 ±20; VEI 6; 30 km3 (7.2 cu mi) of tephra
- Kolumbo, Santorini, Greece; 1650, September 27; VEI 5; 2 km3 (0.5 cu mi) of tephra
- Huaynaputina, Peru; 1600, February 19; VEI 6; 30 km3 (7.2 cu mi) of tephra
- Billy Mitchell, Bougainville Island, Papua New Guinea; 1580 ±20; VEI 6; 14 km3 (3.4 cu mi) of tephra
- Bárðarbunga, Northeastern Iceland; 1477; VEI 6; 10 cubic kilometres (2.4 cu mi) of tephra
- 1465 mystery eruption "the location of this eruption is uncertain, as it has only been identified from distant ice core records and atmospheric events around the time of King Alfonso II of Naples's wedding; it is believed to have been VEI 7 and possibly even larger than Mount Tambora's in 1815.
- 1452–53 New Hebrides arc, Vanuatu; the location of this eruption in the South Pacific is uncertain, as it has been identified from distant ice core records; the only pyroclastic flows are found at Kuwae; 36 to 96 km3 (8.6 to 23.0 cu mi) of tephra; 175,000,000–700,000,000 t (193,000,000–772,000,000 short tons) of sulfuric acid
- 1280(?) in Quilotoa, Ecuador; VEI 6; 21 km3 (5.0 cu mi) of tephra
- 1257 Samalas eruption, Rinjani volcanic complex, Lombok Island, Indonesia; 40 km3 (dense-rock equivalent) of tephra, Arctic and Antarctic Ice cores provide compelling evidence to link the ice core sulfate spike of 1258/1259 A.D. to this volcano.
Overview of Common Era
This is a sortable summary of 27 major eruptions in the last 2000 years with VEI ≥6, implying an average of about 1.3 per century. The count does not include the notable VEI 5 eruptions of Mount St. Helens and Mount Vesuvius. Date uncertainties, tephra volumes, and references are also not included.
|Caldera/ Eruption name||Volcanic arc/ belt
or Subregion or Hotspot
|Mount Pinatubo||Luzon Volcanic Arc||6||1991, Jun 15||Global temperature fell by 0.4 °C|
|Novarupta||Aleutian Range||6||1912, Jun 6|
|Santa María||Central America Volcanic Arc||6||1902, Oct 24|
|Krakatoa||Sunda Arc||6||1883, Aug 26–27||At least 30,000 dead|
|Mount Tambora||Lesser Sunda Islands||7||1815, Apr 10||Year Without a Summer (1816)|
|1808 mystery eruption||Southwestern Pacific Ocean||6||1808, Dec||A sulfate spike in ice cores|
|Grímsvötn and Laki||Iceland||6||1783–85||Mist Hardships, French Revolution|
|Long Island (Papua New Guinea)||Bismarck Volcanic Arc||6||1660|
|Huaynaputina||Andes, Central Volcanic Zone||6||1600, Feb 19||Russian famine of 1601–1603|
|Billy Mitchell||Bougainville & Solomon Is.||6||1580|
|10 October 1465 mystery eruption||unknown||7||1465||Possibly larger than Mount Tambora's|
|Kuwae||New Hebrides Arc||6||1452–53||2nd pulse of Little Ice Age?|
|Quilotoa||Andes, Northern Volcanic Zone||6||1280|
|Samalas (Mount Rinjani)||Lombok, Lesser Sunda Islands||7||1257||1257 Samalas eruption, 1st pulse of Little Ice Age? (c.1250)|
|Baekdu Mountain/Tianchi eruption||China/ North Korea border||7||946, Nov-947||Limited regional climatic effects.|
|Ceboruco||Trans-Mexican Volcanic Belt||6||930|
|Dakataua||Bismarck Volcanic Arc||6||800|
|Pago||Bismarck Volcanic Arc||6||710|
|Mount Churchill||eastern Alaska, USA||6||700|
|Rabaul Caldera||Bismarck Volcanic Arc||6||540 (est.)||Extreme weather events of 535–536|
|Ilopango||Central America Volcanic Arc||6||450|
|Taupo Caldera/Hatepe eruption||Taupo Volcano||7||180 or 230||Affected skies over Rome and China|
|Mount Vesuvius/Pompeii eruption||Italy||5||79|
|Mount Churchill||eastern Alaska, USA||6||60|
|Ambrym||New Hebrides Arc||6||50|
|Apoyeque||Central America Volcanic Arc||6||50 BC (±100)|
Note: Caldera names tend to change over time. For example, Okataina Caldera, Haroharo Caldera, Haroharo volcanic complex, Tarawera volcanic complex had the same magma source in the Taupo Volcanic Zone. Yellowstone Caldera, Henry's Fork Caldera, Island Park Caldera, Heise Volcanic Field had all Yellowstone hotspot as magma source.
Earlier Quaternary eruptions
- Eifel hotspot, Laacher See, Vulkan Eifel, Germany; 12.9 ka; VEI 6; 6 cubic kilometers (1.4 cu mi) of tephra.
- Emmons Lake Caldera (size: 11 x 18 km), Aleutian Range, 17 ka ±5; more than 50 km3 (12 cu mi) of tephra.
- Lake Barrine, Atherton Tableland, North Queensland, Australia; was formed over 17 ka.
- Menengai, East African Rift, Kenya; 29 ka
- Morne Diablotins, Commonwealth of Dominica; VEI 6; 30 ka (Grand Savanne Ignimbrite).
- Kurile Lake, Kamchatka Peninsula, Russia; Golygin eruption; about 41.5 ka; VEI 7
- Maninjau Caldera (size: 20 x 8 km), West Sumatra; VEI 7; around 52 ka; 220 to 250 cubic kilometers (52.8 to 60.0 cu mi) of tephra.
- Lake Toba (size: 100 x 30 km), Sumatra, Indonesia; VEI 8; 73 ka ±4; 2,500 to 3,000 cubic kilometers (599.8 to 719.7 cu mi) of tephra; probably six gigatons of sulfur dioxide were emitted (Youngest Toba Tuff).
- Atitlán Caldera (size: 17 x 20 km), Guatemalan Highlands; Los Chocoyos eruption; formed in an eruption 84 ka; VEI 7; 300 km3 (72 cu mi) of tephra.
- Mount Aso (size: 24 km wide), island of Kyūshū, Japan; 90 ka; last eruption was more than 600 cubic kilometers (144 cu mi) of tephra.
- Sierra La Primavera volcanic complex (size: 11 km wide), Guadalajara, Jalisco, Mexico; 95 ka; 20 cubic kilometers (5 cu mi) of Tala Tuff.
- Mount Aso (size: 24 km wide), island of Kyūshū, Japan; 120 ka; 80 km3 (19 cu mi) of tephra.
- Mount Aso (size: 24 km wide), island of Kyūshū, Japan; 140 ka; 80 km3 (19 cu mi) of tephra.
- Puy de Sancy, Massif Central, central France; it is part of an ancient stratovolcano which has been inactive for about 220,000 years.
- Emmons Lake Caldera (size: 11 x 18 km), Aleutian Range, 233 ka; more than 50 km3 (12 cu mi) of tephra.
- Mount Aso (size: 24 km wide), island of Kyūshū, Japan; caldera formed as a result of four huge caldera eruptions; 270 ka; 80 cubic kilometers (19 cu mi) of tephra.
- Uzon-Geyzernaya calderas (size: 9 x 18 km), Kamchatka Peninsula, Russia; 325–175 ka 20 km3 (4.8 cu mi) of ignimbrite deposits.
- Diamante Caldera–Maipo volcano complex (size: 20 x 16 km), Argentina-Chile; 450 ka; 450 cubic kilometers (108 cu mi) of tephra.
- Yellowstone hotspot; Yellowstone Caldera (size: 45 x 85 km); 640 ka; VEI 8; more than 1,000 cubic kilometers (240 cu mi) of tephra (Lava Creek Tuff)
- Three Sisters (Oregon), USA; Tumalo volcanic center; with eruptions from 600–700 to 170 ka years ago
- Uinkaret volcanic field, Arizona, USA; the Colorado River was dammed by lava flows multiple times from 725 to 100 ka.
- Mono County, California, USA; Long Valley Caldera; 758.9 ka ±1.8; VEI 7; 600 cubic kilometers (144 cu mi) of Bishop Tuff.
- Valles Caldera, New Mexico, USA; around 1.15 Ma; VEI 7; around 600 cubic kilometers (144 cu mi) of the Tshirege formation, Upper Bandelier eruption.
- Sutter Buttes, Central Valley of California, USA; were formed over 1.5 Ma by a now-extinct volcano.
- Ebisutoge-Fukuda tephras, Japan; 1.75 Ma; 380 to 490 cubic kilometers (91.2 to 117.6 cu mi) of tephra.
- Yellowstone hotspot; Island Park Caldera (size: 100 x 50 km); 2.1 Ma; VEI 8; 2,450 cubic kilometers (588 cu mi) of Huckleberry Ridge Tuff.
- Cerro Galán (size: 32 km wide), Catamarca Province, northwestern Argentina; 2.2 Ma; VEI 8; 1,050 cubic kilometers (252 cu mi) of Cerro Galán Ignimbrite.
Large Neogene eruptions
Approximately 5.332 million years BP, the Pliocene epoch begins. Most eruptions before the Quaternary period have an unknown VEI.
- Boring Lava Field, Boring, Oregon, USA; the zone became active at least 2.7 Ma, and has been extinct for about 300,000 years.
- Norfolk Island, Australia; remnant of a basaltic volcano active around 2.3 to 3 Ma.
- Pastos Grandes Caldera (size: 40 x 50 km), Altiplano-Puna volcanic complex, Bolivia; 2.9 Ma; VEI 7; more than 820 cubic kilometers (197 cu mi) of Pastos Grandes Ignimbrite.
- Little Barrier Island, northeastern coast of New Zealand's North Island; it erupted from 1 million to 3 Ma.
- Mount Kenya; a stratovolcano created approximately 3 Ma after the opening of the East African rift.
- Pacana Caldera (size: 60 x 35 km), Altiplano-Puna Volcanic Complex, northern Chile; 4 Ma; VEI 8; 2,500 cubic kilometers (600 cu mi) of Atana Ignimbrite.
- Frailes Plateau, Bolivia; 4 Ma; 620 cubic kilometers (149 cu mi) of Frailes Ignimbrite E.
- Cerro Galán (size: 32 km wide), Catamarca Province, northwestern Argentina; 4.2 Ma; 510 cubic kilometers (122 cu mi) of Real Grande and Cueva Negra tephra.
- Yellowstone hotspot, Heise volcanic field, Idaho; Kilgore Caldera (size: 80 x 60 km); VEI 8; 1,800 cubic kilometers (432 cu mi) of Kilgore Tuff; 4.45 Ma ±0.05.
- Khari Khari Caldera, Frailes Plateau, Bolivia; 5 Ma; 470 cubic kilometers (113 cu mi) of tephra.
- Cerro Guacha, Bolivia; 5.6–5.8 Ma (Guacha ignimbrite).
- Lord Howe Island, Australia; Mount Lidgbird and Mount Gower are both made of basalt rock, remnants of lava flows that once filled a large volcanic caldera 6.4 Ma.
- Yellowstone hotspot, Heise volcanic field, Idaho; 5.51 Ma ±0.13 (Conant Creek Tuff).
- Yellowstone hotspot, Heise volcanic field, Idaho; 5.6 Ma; 500 cubic kilometers (120 cu mi) of Blue Creek Tuff.
- Cerro Panizos (size: 18 km wide), Altiplano-Puna Volcanic Complex, Bolivia; 6.1 Ma; 652 cubic kilometers (156 cu mi) of Panizos Ignimbrite.
- Yellowstone hotspot, Heise volcanic field, Idaho; 6.27 Ma ±0.04 (Walcott Tuff).
- Yellowstone hotspot, Heise volcanic field, Idaho; Blacktail Caldera (size: 100 x 60 km), Idaho; 6.62 Ma ±0.03; 1,500 cubic kilometers (360 cu mi) of Blacktail Tuff.
- Pastos Grandes Caldera (size: 40 x 50 km), Altiplano-Puna Volcanic Complex, Bolivia; 8.3 Ma; 652 cubic kilometers (156 cu mi) of Sifon Ignimbrite.
- Manus Island, Admiralty Islands, northern Papua New Guinea; 8–10 Ma
- Banks Peninsula, New Zealand; Akaroa erupted 9 Ma, Lyttelton erupted 12 Ma.
- Mascarene Islands were formed in a series of undersea volcanic eruptions 8–10 Ma, as the African plate drifted over the Réunion hotspot.
- Yellowstone hotspot, Twin Fall volcanic field, Idaho; 8.6 to 10 Ma.
- Yellowstone hotspot, Picabo volcanic field, Idaho; 10.21 Ma ± 0.03 (Arbon Valley Tuff).
- Mount Cargill, New Zealand; the last eruptive phase ended some 10 Ma. The center of the caldera is about Port Chalmers, the main port of the city of Dunedin.
- Yellowstone hotspot, Idaho; Bruneau-Jarbidge volcanic field; 10.0 to 12.5 Ma (Ashfall Fossil Beds eruption).
- Anahim hotspot, British Columbia, Canada; has generated the Anahim Volcanic Belt over the last 13 million years.
- Yellowstone hotspot, Owyhee-Humboldt volcanic field, Nevada/ Oregon; around 12.8 to 13.9 Ma.
- Tejeda Caldera, Gran Canaria, Spain; 13.9 Ma; the 80 km3 eruption produced a composite ignimbrite (P1) of rhyolite, trachyte and basaltic materials, with a thickness of 30 metres at 10 km from the caldera center
- Gran Canaria shield basalt eruption, Spain; 14.5 to 14 Ma; 1,000 km3 of tholeiitic to alkali basalts
- Campi Flegrei, Naples, Italy; 14.9 Ma; 79 cubic kilometers (19 cu mi) of Neapolitan Yellow Tuff.
- Huaylillas Ignimbrite, Bolivia, southern Peru, northern Chile; 15 Ma ±1; 1,100 cubic kilometers (264 cu mi) of tephra.
- Yellowstone hotspot, McDermitt volcanic field (North), Trout Creek Mountains, Whitehorse Caldera (size: 15 km wide), Oregon; 15 Ma; 40 cubic kilometers (10 cu mi) of Whitehorse Creek Tuff.
- Yellowstone hotspot (?), Lake Owyhee volcanic field; 15.0 to 15.5 Ma.
- Yellowstone hotspot, McDermitt volcanic field (South), Jordan Meadow Caldera, (size: 10–15 km wide), Nevada/ Oregon; 15.6 Ma; 350 cubic kilometers (84 cu mi) Longridge Tuff member 2-3.
- Yellowstone hotspot, McDermitt volcanic field (South), Longridge Caldera, (size: 33 km wide), Nevada/ Oregon; 15.6 Ma; 400 cubic kilometers (96 cu mi) Longridge Tuff member 5.
- Yellowstone hotspot, McDermitt volcanic field (South), Calavera Caldera, (size: 17 km wide), Nevada/ Oregon; 15.7 Ma; 300 cubic kilometers (72 cu mi) of Double H Tuff.
- Yellowstone hotspot, McDermitt volcanic field (South), Hoppin Peaks Caldera, 16 Ma; Hoppin Peaks Tuff.
- Yellowstone hotspot, McDermitt volcanic field (North), Trout Creek Mountains, Pueblo Caldera (size: 20 x 10 km), Oregon; 15.8 Ma; 40 cubic kilometers (10 cu mi) of Trout Creek Mountains Tuff.
- Yellowstone hotspot, McDermitt volcanic field (South), Washburn Caldera, (size: 30 x 25 km wide), Nevada/ Oregon; 16.548 Ma; 250 cubic kilometers (60 cu mi) of Oregon Canyon Tuff.
- Yellowstone hotspot (?), Northwest Nevada volcanic field (NWNV), Virgin Valley, High Rock, Hog Ranch, and unnamed calderas; West of Pine Forest Range, Nevada; 15.5 to 16.5 Ma.
- Yellowstone hotspot, Steens and Columbia River flood basalts, Pueblo, Steens, and Malheur Gorge-region, Pueblo Mountains, Steens Mountain, Washington, Oregon, and Idaho, USA; most vigorous eruptions were from 14–17 Ma; 180,000 cubic kilometers (43,184 cu mi) of lava.
- Mount Lindesay (New South Wales), Australia; is part of the remnants of the Nandewar extinct volcano that ceased activity about 17 Ma after 4 million years of activity.
- Oxaya Ignimbrites, northern Chile (around 18°S); 19 Ma; 3,000 cubic kilometers (720 cu mi) of tephra.
- Pemberton Volcanic Belt was erupting about 21 to 22 Ma.
Volcanism before the Neogene
- Paleogene ends 23 million years ago.
- The formation of the Chilcotin Group basalts occurs between 10–6 million years ago.
- The formation of the Columbia River Basalt Group occurs between 17 and 6 million years ago.
- La Garita Caldera erupts in the Wheeler Geologic Area, Central Colorado volcanic field, Colorado, USA, eruption several VEI8 events (Possibly as high as a VEI9), 5,000 cubic kilometers (1,200 cu mi) of Fish Canyon Tuff was blasted out in a major single eruption about 27.8 million years ago.
- Unknown source in Ethiopia erupts 29 million years ago with at least 3,000 cubic kilometers (720 cu mi) of Green Tuff and SAM.
- Sam Ignimbrite in Yemen forms 29.5 million years ago, at least 5,550 cubic kilometers (1,332 cu mi) of distal tuffs associated with the ignimbrites.
- Jabal Kura’a Ignimbrite in Yemen forms 29.6million years ago, at least 3,700 cubic kilometers (888 cu mi) of distal tuffs associated with the ignimbrites.
- The Ethiopian Highlands flood basalt begins 30 million years ago
- About 33.9 million ago, the Oligocene epoch of the Paleogene period begins
- The Mid-Tertiary ignimbrite flare-up begins 40 million years ago and last till 25 million years ago.
- Bennett Lake Volcanic Complex erupts 50 million years ago with a VEI7 850 cubic kilometers (204 cu mi) of tephra.
- Canary hotspot is believed to have first appeared about 60 million years ago.
- Formation of the Brito-Arctic province begins 61 million years ago.
- Approximately 66 million years ago, the Cretaceous–Paleogene extinction event occurred
- Réunion hotspot, Deccan Traps, India, formed between 60 and 68 million years ago which are thought to have played a role in the K-Pg extinction.
- The Louisville hotspot has produced the Louisville Ridge, it is active for at least 80 million years. It may have originated the Ontong Java Plateau around 120 million years ago.
- Hawaii hotspot, Meiji Seamount is the oldest extant seamount in the Hawaiian-Emperor seamount chain, with an estimated age of 82 million years.
- The Kerguelen Plateau begins forming 110 million years ago.
- The Rahjamal Traps form from 117–116 million years ago.
- The Ontong Java Plateau forms from 125–120 million years ago
- Paraná and Etendeka traps, Brazil, Namibia and Angola form 128 to 138 million years ago. 132 million years ago, a possible supervolcanic eruption occurred, ejecting 8,600 cubic kilometers (2,063 cu mi).
- Formation of the Karoo-Ferrar flood basalts begins 183 million years ago.
- The flood basalts of the Central Atlantic magmatic province are thought to have contributed to the Triassic–Jurassic extinction event about 199 million years ago.
- The Siberian Traps are thought to have played a significant role in the Permian–Triassic extinction event 252 million years ago.
- Formation of the Emeishan Traps began 260 million years ago.
- The Late Devonian extinction occurs about 374 million years ago.
- The Ordovician–Silurian extinction event occurs between 450 and 440 million years ago.
- The Phanerozoic eon begins 542 million years ago
- Approximately 2,500 million years ago, the Proterozoic eon of the Precambrian period begins
- About 3,800 million years ago, the Archean eon of the Precambrian period begins
- The Mackenzie Large Igneous Province contains the largest and best-preserved continental flood basalt terrain on Earth. The Mackenzie dike swarm throughout the Mackenzie Large Igneous Province is also the largest dike swarm on Earth, covering an area of 2,700,000 km2 (1,000,000 sq mi).
- The Bachelor (27.4 Ma), San Luis (27–26.8 Ma), and Creede (26 Ma) calderas partially overlap each other and are nested within the large La Garita (27.6 Ma) caldera, forming the central caldera cluster of the San Juan volcanic field, Wheeler Geologic Area, La Garita Wilderness. Creede, Colorado and San Luis Peak (Continental Divide of the Americas) are nearby. North Pass Caldera is northeastern the San Juan Mountains, North Pass. The Platoro volcanic complex lies southeastern of the central caldera cluster. The center of the western San Juan caldera cluster lies just West of Lake City, Colorado.
- The Rio Grande rift includes the San Juan volcanic field, the Valles Caldera, the Potrillo volcanic field, and the Socorro-Magdalena magmatic system. The Socorro Magma Body is uplifting the surface at approximately 2 mm/year.
- The southwestern Nevada volcanic field, or Yucca Mountain volcanic field, includes: Stonewall Mountain caldera complex, Black Mountain Caldera, Silent Canyon Caldera, Timber Mountain – Oasis Valley caldera complex, Crater Flat Group, and Yucca Mountain. Towns nearby: Beatty, Mercury, Goldfield. It is aligned as a Crater Flat volcanic field, Réveille Range, Lunar Crater volcanic field, Zone (CFLC). The Marysvale Volcanic Field, southwestern Utah is nearby too.
- McDermitt volcanic field, or Orevada rift volcanic field, Nevada/ Oregon, nearby are: McDermitt, Trout Creek Mountains, Bilk Creek Mountains, Steens Mountain, Jordan Meadow Mountain (6,816 ft), Long Ridge, Trout Creek, and Whitehorse Creek.
- Emmons Lake stratovolcano (caldera size: 11 x 18 km), Aleutian Range, was formed through six eruptions. Mount Emmons, Mount Hague, and Double Crater are post-caldera cones.
- The topography of the Basin and Range Province is a result of crustal extension within this part of the North American Plate (rifting of the North American craton or Laurentia from Western North America; e.g. Gulf of California, Rio Grande rift, Oregon-Idaho graben). The crust here has been stretched up to 100% of its original width. In fact, the crust underneath the Basin and Range, especially under the Great Basin (includes Nevada), is some of the thinnest in the world.
- Topographically visible calderas: South part of the McDermitt volcanic field (four overlapping and nested calderas), West of McDermitt; Cochetopa Park Caldera, West of the North Pass; Henry's Fork Caldera; Banks Peninsula, New Zealand (Photo) and Valles Caldera. Newer drawings show McDermitt volcanic field (South), as five overlapping and nested calderas. Hoppin Peaks Caldera is included too.
- Repose periods: Toba (0.38 Ma), Valles Caldera (0.35 Ma), Yellowstone Caldera (0.7 Ma).
- Kiloannum (ka), is a unit of time equal to one thousand years. Megaannum (Ma), is a unit of time equal to one million years, one can assume that "ago" is implied.
Volcanic Explosivity Index (VEI)
|0||Effusive||Masaya Volcano, Nicaragua, 1570|
|1||>0.00001||Poás Volcano, Costa Rica, 1991|
|2||>0.001||Mount Ruapehu, New Zealand, 1971|
|3||>0.01||Nevado del Ruiz, Colombia, 1985|
|4||>0.1||Eyjafjallajökull, Iceland, 2010|
|5||>1||Mount St. Helens, United States, 1980|
|6||>10||Mount Pinatubo, Philippines, 1991|
|7||>100||Mount Tambora, Indonesia, 1815|
|8||>1000||Yellowstone Caldera, United States, Pleistocene|
The global dimming through volcanism (ash aerosol and sulfur dioxide) is quite independent of the eruption VEI. When sulfur dioxide (boiling point at standard state: -10 °C) reacts with water vapor, it creates sulfate ions (the precursors to sulfuric acid), which are very reflective; ash aerosol on the other hand absorbs Ultraviolet. Global cooling through volcanism is the sum of the influence of the global dimming and the influence of the high albedo of the deposited ash layer. The lower snow line and its higher albedo might prolong this cooling period. Bipolar comparison showed six sulfate events: Tambora (1815), Cosigüina (1835), Krakatoa (1883), Agung (1963), and El Chichón (1982), and the 1808 mystery eruption. And the atmospheric transmission of direct solar radiation data from the Mauna Loa Observatory (MLO), Hawaii (19°32'N) detected only five eruptions:
- June 11, 2009, Sarychev Peak (?), Kuril Islands, 400 tons of tephra, VEI 4
- June 12–15, 1991 (eruptive climax), Mount Pinatubo, Philippines, 11,000 ±0.5 tons of tephra, VEI 6
- Global cooling: 0.5 °C,
- March 28, 1982, El Chichón, Mexico, 2,300 tons of tephra, VEI 5
- October 10, 1974, Volcán de Fuego, Guatemala, 400 tons of tephra, VEI 4
- February 18, 1963, Mount Agung, Lesser Sunda Islands, 100 tons of lava, more than 1,000 tons of tephra, VEI 5
- Northern Hemisphere cooling: 0.3 °C,
But very large sulfur dioxide emissions overdrive the oxidizing capacity of the atmosphere. Carbon monoxide's and methane's concentration goes up (greenhouse gases), global temperature goes up, ocean's temperature goes up, and ocean's carbon dioxide solubility goes down.
Satellite measurements of ash and aerosol emissions from Mount Pinatubo.
MLO transmission ratio - Solar radiation reduction due to volcanic eruptions
NASA, Global Dimming - El Chichon, VEI 5; Pinatubo, VEI 6.
Sulfur dioxide emissions by volcanoes. Mount Pinatubo: 20 million tons of sulfur dioxide.
Diagram of Island Park and Henry's Fork Caldera.
Steens Mountain, McDermitt volcanic field and Oregon/ Nevada stateline.
Snake River Plain, image from NASA's Aqua satellite, 2008
Jemez Ranger District and Jemez Mountains, Santa Fe National Forest.
- Decade Volcanoes
- Dense-rock equivalent
- Extreme weather events of 535–536
- Geologic timeline of Western North America
- Hotspot (geology)
- List of largest volcanic eruptions
- List of volcanoes in Iceland
- List of volcanoes in Mexico
- List of volcanoes in Papua New Guinea
- Lists of volcanoes
- Ring of Fire
- Stratospheric sulfur aerosols
- Trans-Mexican Volcanic Belt
- Volcanic arc
- Volcanic Explosivity Index
- Volcanic winter
- Year Without a Summer
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