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A caldera is a large cauldron-like depression that forms following the evacuation of a magma chamber/reservoir. When large volumes of magma are erupted over a short time, structural support for the crust above the magma chamber is lost. The ground surface then collapses downward into the partially emptied magma chamber, leaving a massive depression at the surface (from one to dozens of kilometers in diameter). Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Only seven known caldera-forming collapses have occurred since the start of the 20th century, most recently at Bárðarbunga
Bárðarbunga
volcano in Iceland.[1]

Contents

1 Etymology 2 Caldera
Caldera
formation

2.1 Mineralization 2.2 Explosive caldera eruptions

2.2.1 Toba

2.3 Non-explosive calderas

3 Extraterrestrial calderas

3.1 The Moon 3.2 Mars 3.3 Venus 3.4 Io

4 List of volcanic calderas 5 Erosion calderas 6 See also 7 Notes 8 References 9 External links

Etymology[edit] The word comes from Spanish caldera, and Latin
Latin
caldaria, meaning "cooking pot". In some texts the English term cauldron is also used. The term caldera was introduced into the geological vocabulary by the German geologist Leopold von Buch
Leopold von Buch
when he published his memoirs of his 1815 visit to the Canary Islands,[note 1] where he first saw the Las Cañadas caldera on Tenerife, with Montaña Teide
Teide
dominating the landscape, and then the Caldera de Taburiente
Caldera de Taburiente
on La Palma. Caldera
Caldera
formation[edit]

Animation of analogue experiment showing origin of volcanic caldera in box filled with flour.

Landsat
Landsat
image of Lake Toba, on the island of Sumatra, Indonesia
Indonesia
(100 km/62 mi long and 30 km/19 mi wide, one of the world's largest calderas). A resurgent dome formed the island of Samosir.

A collapse is triggered by the emptying of the magma chamber beneath the volcano, sometimes as the result of a large explosive volcanic eruption (see Tambora in 1815), but also during effusive eruptions on the flanks of a volcano (see Piton de la Fournaise
Piton de la Fournaise
in 2007) or in a connected fissure system (see Bárðarbunga
Bárðarbunga
in 2014–2015). If enough magma is ejected, the emptied chamber is unable to support the weight of the volcanic edifice above it. A roughly circular fracture, the "ring fault", develops around the edge of the chamber. Ring fractures serve as feeders for fault intrusions which are also known as ring dykes. Secondary volcanic vents may form above the ring fracture. As the magma chamber empties, the center of the volcano within the ring fracture begins to collapse. The collapse may occur as the result of a single cataclysmic eruption, or it may occur in stages as the result of a series of eruptions. The total area that collapses may be hundreds or thousands of square kilometers. Mineralization[edit] Some calderas are known to host rich ore deposits. One of the world's best-preserved mineralized calderas is the Sturgeon Lake Caldera in northwestern Ontario, Canada, which formed during the Neoarchean era[2] about 2,700 million years ago.[3] Explosive caldera eruptions[edit] Further information: Explosive eruption If the magma is rich in silica, the caldera is often filled in with ignimbrite, tuff, rhyolite, and other igneous rocks. Silica-rich magma has a high viscosity, and therefore does not flow easily like basalt. As a result, gases tend to become trapped at high pressure within the magma. When the magma approaches the surface of the Earth, the rapid off-loading of overlying material causes the trapped gases to decompress rapidly, thus triggering explosive destruction of the magma and spreading volcanic ash over wide areas. Further lava flows may be erupted. If volcanic activity continues, the center of the caldera may be uplifted in the form of a resurgent dome such as is seen at Cerro Galán, Lake Toba, Yellowstone, etc., by subsequent intrusion of magma. A silicic or rhyolitic caldera may erupt hundreds or even thousands of cubic kilometers of material in a single event. Even small caldera-forming eruptions, such as Krakatoa
Krakatoa
in 1883 or Mount Pinatubo in 1991, may result in significant local destruction and a noticeable drop in temperature around the world. Large calderas may have even greater effects. When Yellowstone Caldera
Yellowstone Caldera
last erupted some 650,000 years ago, it released about 1,000 km3 of material (as measured in dense rock equivalent (DRE)), covering a substantial part of North America
North America
in up to two metres of debris. By comparison, when Mount St. Helens
Mount St. Helens
erupted in 1980, it released ~1.2 km3 (DRE) of ejecta. The ecological effects of the eruption of a large caldera can be seen in the record of the Lake Toba
Lake Toba
eruption in Indonesia. Toba[edit] Main article: Lake Toba About 74,000 years ago, this Indonesian volcano released about 2,800 km3 DRE of ejecta, the largest known eruption within the Quaternary
Quaternary
Period (last 1.8 million years) and the largest known explosive eruption within the last 25 million years. In the late 1990s, anthropologist Stanley Ambrose[4] proposed that a volcanic winter induced by this eruption reduced the human population to about 2,000–20,000 individuals, resulting in a population bottleneck (see Toba catastrophe theory). More recently several geneticists, including Lynn Jorde and Henry Harpending have proposed that the human species was reduced to approximately five to ten thousand people.[5] However, there is no direct evidence that the theory is correct, and there is no evidence for any other animal decline or extinction, even in environmentally sensitive species.[6] There is evidence that human habitation continued in India
India
after the eruption.[7] The theory in its strongest form may be incorrect. Eruptions forming even larger calderas are known, especially La Garita Caldera
Caldera
in the San Juan Mountains
San Juan Mountains
of Colorado, where the 5,000-km3 Fish Canyon Tuff
Tuff
was blasted out in a single major eruption about 27.8 million years ago. At some points in geological time, rhyolitic calderas have appeared in distinct clusters. The remnants of such clusters may be found in places such as the San Juan Mountains
San Juan Mountains
of Colorado
Colorado
(formed during the Oligocene, Miocene, and Pliocene
Pliocene
periods) or the Saint Francois Mountain Range of Missouri
Missouri
(erupted during the Proterozoic).

Satellite photograph of the summit caldera on Fernandina Island
Fernandina Island
in the Galápagos archipelago.

Oblique aerial photo of Nemrut Caldera, Van Lake, Eastern Turkey

Non-explosive calderas[edit]

Sollipulli
Sollipulli
Caldera, located in central Chile
Chile
near the border with Argentina, filled with ice. The volcano sits in the southern Andes Mountains within Chile's Parque Nacional Villarica.[8]

Some volcanoes, such as shield volcanoes Kīlauea
Kīlauea
and Mauna Loa (respectively the most active and second largest on Earth, are both on the island of Hawaii), form calderas in a different fashion. The magma feeding these volcanoes is basalt which is silica poor. As a result, the magma is much less viscous than the magma of a rhyolitic volcano, and the magma chamber is drained by large lava flows rather than by explosive events. The resulting calderas are also known as subsidence calderas, and can form more gradually than explosive calderas. For instance, the caldera atop Fernandina Island
Fernandina Island
underwent a collapse in 1968, when parts of the caldera floor dropped 350 meters.[9] Kilauea Caldera
Caldera
has an inner crater known as Halema‘uma‘u, which has often been filled by a lava lake. During the April 2007 eruption of the Piton de la Fournaise
Piton de la Fournaise
on the island of Réunion, the floor of the main crater suddenly dropped about 300 m. This was attributed to the withdrawal of magma which was being erupted through a vent lower down on the southern flank of the volcano. Another process that may allow a caldera to form can occur if molten lava can escape through a breach on the caldera's rim. Extraterrestrial calderas[edit] Since the early 1960s, it has been known that volcanism has occurred on other planets and moons in the Solar System. Through the use of manned and unmanned spacecraft, volcanism has been discovered on Venus, Mars, the Moon, and Io, a satellite of Jupiter. None of these worlds have plate tectonics, which contributes approximately 60% of the Earth's volcanic activity (the other 40% is attributed to hotspot volcanism).[10] Caldera
Caldera
structure is similar on all of these planetary bodies, though the size varies considerably. The average caldera diameter on Venus
Venus
is 68 km. The average caldera diameter on Io is close to 40 km, and the mode is 6 km; Tvashtar Paterae
Tvashtar Paterae
is likely the largest caldera with a diameter of 290 km. The average caldera diameter on Mars
Mars
is 48 km, smaller than Venus. Calderas on Earth are the smallest of all planetary bodies and vary from 1.6 to 80 km as a maximum.[11] The Moon[edit] The Moon
Moon
has an outer shell of low-density crystalline rock that is a few hundred kilometers thick, which formed due to a rapid creation. The craters of the moon have been well preserved through time and were once thought to have been the result of extreme volcanic activity, but actually were formed by meteorites, nearly all of which took place in the first few hundred million years after the Moon
Moon
formed. Around 500 million years afterward, the Moon's mantle was able to be extensively melted due to the decay of radioactive elements. Massive basaltic eruptions took place generally at the base of large impact craters. Also, eruptions may have taken place due to a magma reservoir at the base of the crust. This forms a dome, possibly the same morphology of a shield volcano where calderas universally are known to form.[10] Although caldera-like structures are rare on the Moon, they are not completely absent. The Compton-Belkovich Volcanic Complex on the far side of the Moon
Moon
is thought to be a caldera, possibly an ash-flow caldera.[12] Mars[edit] Further information: Volcanology of Mars The volcanic activity of Mars
Mars
is concentrated in two major provinces: Tharsis
Tharsis
and Elysium. Each province contains a series of giant shield volcanoes that are similar to what we see on Earth and likely are the result of mantle hot spots. The surfaces are dominated by lava flows, and all have one or more collapse calderas.[10] Mars
Mars
has the largest volcano in the Solar System, Olympus Mons, which is more than three times the height of Mount Everest, with a diameter of 520 km (323 miles). The summit of the mountain has six nested calderas.[13] Venus[edit] Further information: Volcanology of Venus Because there is no plate tectonics on Venus, heat is mainly lost by conduction through the lithosphere. This causes enormous lava flows, accounting for 80% of Venus' surface area. Many of the mountains are large shield volcanoes that range in size from 150–400 km in diameter and 2–4 km high. More than 80 of these large shield volcanoes have summit calderas averaging 60 km across.[10] Io[edit] Further information: Volcanology of Io Io, unusually, is heated by solid flexing due to the tidal influence of Jupiter
Jupiter
and Io's orbital resonance with neighboring large moons Europa and Ganymede, which keeps its orbit slightly eccentric. Unlike any of the planets mentioned, Io is continuously volcanically active. For example, the NASA Voyager 1
Voyager 1
and Voyager 2
Voyager 2
spacecraft detected nine erupting volcanoes while passing Io in 1979. Io has many calderas with diameters tens of kilometers across.[10] List of volcanic calderas[edit] See also: Category:Calderas

Africa

Ngorongoro Crater
Ngorongoro Crater
(Tanzania) Menengai
Menengai
Crater (Kenya) Mount Elgon
Mount Elgon
(Uganda/Kenya) Mount Fogo
Mount Fogo
(Cape Verde) Mount Longonot
Mount Longonot
(Kenya) Mount Meru (Tanzania) Erta Ale
Erta Ale
(Ethiopia) Nabro Volcano
Volcano
(Eritrea) Mallahle
Mallahle
(Eritrea) See Europe for calderas in the Canary Islands

Asia

East Asia

Dakantou Caldera
Caldera
(大墈头) (Shanhuyan Village, Taozhu Town, Linhai, Zhejiang, China) Ma'anshan Caldera
Caldera
(马鞍山) (Shishan Town (石山镇), Xiuying, Hainan, China) Yiyang Caldera
Caldera
(宜洋) (Shuangxi Town (双溪镇宜洋村), Pingnan County, Fujian, China) Aira Caldera
Aira Caldera
(Kagoshima Prefecture, Japan) Kussharo (Hokkaido, Japan) Kuttara (Hokkaido, Japan) Mashū (Hokkaido, Japan) Aso (Kumamoto Prefecture, Japan) Kikai Caldera
Kikai Caldera
(Kagoshima Prefecture, Japan) Towada (Aomori Prefecture, Japan) Tazawa (Akita Prefecture, Japan) Hakone (Kanagawa Prefecture, Japan) Mount Halla
Mount Halla
(Jeju-do, South Korea) Heaven Lake
Heaven Lake
(Baekdu Mountain, North Korea)

Southeast Asia

Mount Pinatubo, Philippines

Mount Pinatubo
Mount Pinatubo
(Luzon, Philippines) Taal Volcano
Volcano
(Luzon, Philippines) Laguna de Bay
Laguna de Bay
(Luzon, Philippines) Batur (Bali, Indonesia) Krakatoa
Krakatoa
(Sunda Strait, Indonesia) Lake Maninjau
Lake Maninjau
(Sumatra, Indonesia) Lake Toba
Lake Toba
(Sumatra, Indonesia) Mount Tondano
Mount Tondano
(Sulawesi, Indonesia) Mount Tambora
Mount Tambora
(Sumbawa, Indonesia) Tengger Caldera
Caldera
(Java, Indonesia)

Southwest Asia

Derik
Derik
(Mardin, Turkey) Nemrut (volcano)
Nemrut (volcano)
(Turkey)

Russia

Caldera
Caldera
of the island Yankicha/Ushishir, Kuril Islands

Akademia Nauk (Kamchatka Peninsula) Golovnin
Golovnin
(Kuril Islands) Karymsky Caldera
Caldera
(Kamchatka Peninsula) Khangar
Khangar
(Kamchatka Peninsula) Ksudach
Ksudach
(Kamchatka Peninsula) Kurile Lake
Kurile Lake
(Kamchatka Peninsula) Lvinaya Past
Lvinaya Past
(Kuril Islands) Tao-Rusyr Caldera
Tao-Rusyr Caldera
(Kuril Islands) Uzon
Uzon
(Kamchatka Peninsula) Zavaritski Caldera
Zavaritski Caldera
(Kuril Islands) Yankicha/ Ushishir
Ushishir
(Kuril Islands) Chegem Caldera
Caldera
(Kabardino-Balkarian Republic, Northern Caucasus Region)

Americas

Argentina

Aguas Calientes, Salta Province Caldera
Caldera
del Atuel, Mendoza Province Galán, Catamarca Province

United States

Crater Lake, Oregon, formed around 5,680 BC

Mt. St. Helens- Caldera
Caldera
with the Lava
Lava
dome

Aniakchak-caldera, Alaska

Mount Aniakchak
Mount Aniakchak
(Aniakchak National Monument and Preserve) (Alaska) Crater Lake
Crater Lake
on Mount Mazama
Mount Mazama
( Crater Lake
Crater Lake
National Park, Oregon) Mt. St. Helens
Mt. St. Helens
(Washington) Mount Katmai
Mount Katmai
(Alaska) La Garita Caldera
La Garita Caldera
(Colorado) Long Valley (California) Henry's Fork Caldera
Henry's Fork Caldera
(Idaho) Island Park Caldera
Island Park Caldera
(Idaho, Wyoming) Newberry Volcano
Volcano
(Oregon) McDermitt Caldera
McDermitt Caldera
(Oregon) Mount Okmok (Alaska) Valles Caldera
Valles Caldera
(New Mexico) Yellowstone Caldera
Yellowstone Caldera
(Wyoming)

Canada

Silverthrone Caldera
Silverthrone Caldera
(British Columbia) Mount Edziza
Mount Edziza
(British Columbia) Bennett Lake Volcanic Complex (British Columbia/Yukon) Mount Pleasant Caldera
Mount Pleasant Caldera
(New Brunswick) Sturgeon Lake Caldera (Ontario) Mount Skukum Volcanic Complex (Yukon, Canada) Blake River Megacaldera Complex
Blake River Megacaldera Complex
(Quebec/Ontario)

New Senator Caldera
New Senator Caldera
(Quebec) Misema Caldera
Misema Caldera
(Ontario/Quebec) Noranda Caldera
Noranda Caldera
(Quebec)

Colombia

Arenas crater caldera, Nevado del Ruiz
Nevado del Ruiz
volcano, Caldas Department Laguna Verde caldera, Azufral
Azufral
volcano, Narino Department

Mexico

Amealco Caldera
Caldera
(Querétaro) Las Cumbres Caldera
Caldera
(Veracruz-Puebla) Los Azufres Caldera
Caldera
(Michoacán) Los Humeros Caldera
Caldera
(Veracruz-Puebla) Mazahua Caldera
Caldera
( Mexico
Mexico
State)

Chile

Chaitén Cordillera Nevada Caldera Laguna del Maule Pacana Caldera Sollipulli

Ecuador

Pululahua Geobotanical Reserve Cuicocha Quilotoa Fernandina Island, Galápagos Islands Sierra Negra (Galápagos)

El Salvador

Coatepeque Caldera, El Salvador
El Salvador
crater lake

Lake Ilopango Lake Coatepeque

Other

Masaya (Nicaragua) Lake Atitlan
Lake Atitlan
(Guatemala)

Europe

3D CGI aerial spinning view over Santorini, Greece.

Banská Štiavnica
Banská Štiavnica
(Slovakia) Bakuriani/Didveli Caldera
Caldera
(Georgia) Samsari
Samsari
(Georgia) Santorini
Santorini
(Greece) Nisyros
Nisyros
(Greece) Askja
Askja
(Iceland) Grímsvötn
Grímsvötn
(Iceland) Bárðarbunga
Bárðarbunga
(Iceland) Katla (Iceland) Krafla
Krafla
(Iceland) Campi Flegrei
Campi Flegrei
(Italy) Lake Bracciano
Lake Bracciano
(Italy) Lake Bolsena
Lake Bolsena
(Italy) Mount Somma
Mount Somma
which contains Mount Vesuvius
Mount Vesuvius
(Italy) Las Cañadas (Tenerife, Spain) Glen Coe
Glen Coe
(Scotland) Laacher See
Laacher See
(Germany) Lagoa das Sete Cidades
Lagoa das Sete Cidades
& Furnas (São Miguel, the Azores, Portugal)

Oceania

Satellite photo of Lake Taupo

Lake Rotorua
Lake Rotorua
(New Zealand) Okataina (New Zealand) Kapenga (New Zealand) Ohakuri (New Zealand) Maroa (New Zealand) Mount Warning
Mount Warning
(Australia) Reporoa caldera
Reporoa caldera
(New Zealand) Lake Taupo
Lake Taupo
(New Zealand) Kilauea
Kilauea
(Hawaii, US) Moku‘āweoweo Caldera
Caldera
on Mauna Loa
Mauna Loa
(Hawaii, US) Rano Kau
Rano Kau
(Easter Island, Chile)

Antarctica

Deception Island

Indian Ocean

Cirque de Mafate, Cirque de Salazie, Enclos Fouqué, and Cirque de Cilaos on Réunion

Mars

Olympus Mons
Olympus Mons
caldera

Venus

Maat Mons
Maat Mons
caldera

Erosion calderas[edit]

Americas

Guaichane-Mamuta (Chile) Mount Tehama
Mount Tehama
(California, US)

Europe

Caldera de Taburiente
Caldera de Taburiente
(Spain) Scafell Caldera
Caldera
(Lake District, Great Britain)

Oceania

Tweed Valley (New South Wales, Queensland, Australia)

Asia

Chegem Caldera
Caldera
(Kabardino-Balkarian Republic, Northern Caucasus Region, Russia) Taal volcano
Taal volcano
(Philippines) Batangas Province

See also[edit]

Complex volcano Somma volcano Supervolcano Volcanic Explosivity Index

Notes[edit]

^ Leopold von Buch's book Physical Description of the Canary Isles was published in 1825

References[edit]

^ Gudmundsson, M.T. et al. (2014) Graduale caldera collapse at Bárðarbunga
Bárðarbunga
volcano Iceland, regulated by lateral magma outflow, Science, 15. ^ "UMD: Precambrian Research Center". University of Minnesota, Duluth. Retrieved 2014-03-20.  ^ Ron Morton. " Caldera
Caldera
Volcanoes". University of Minnesota, Duluth. Retrieved 2015-07-03.  ^ "Stanley Ambrose page". University of Illinois at Urbana-Champaign. Retrieved 2014-03-20.  ^ Supervolcanoes, BBC2, 3 February 2000 ^ Gathorne-Hardy, F.J; Harcourt-Smith, W.E.H (2003). "The super-eruption of Toba, did it cause a human bottleneck?". Journal of Human
Human
Evolution. 45 (3): 227–30. doi:10.1016/S0047-2484(03)00105-2. PMID 14580592.  ^ Petraglia, M.; Korisettar, R.; Boivin, N.; Clarkson, C.; Ditchfield, P.; Jones, S.; Koshy, J.; Lahr, M. M.; Oppenheimer, C.; Pyle, D.; Roberts, R.; Schwenninger, J.-L.; Arnold, L.; White, K. (2007). "Middle Paleolithic Assemblages from the Indian Subcontinent Before and After the Toba Super-Eruption". Science. 317 (5834): 114–16. Bibcode:2007Sci...317..114P. doi:10.1126/science.1141564. PMID 17615356.  ^ "EO". Earthobservatory.nasa.gov. Retrieved 2014-03-20.  ^ "Fernandina: Photo". Global Volcanism Program. Smithsonian Institution.  ^ a b c d e Parfitt, L.; Wilson, L. (Feb 19, 2008). "Volcanism on Other Planets". Fundamentals of Physical Volcanology. Malden, MA: Blackwell Publishing. pp. 190–212. ISBN 978-0-632-05443-5. OCLC 173243845.  ^ Gudmundsson, A. (2008) Magma chamber
Magma chamber
geometry, fluid transport, local stresses and rock behaviour during collapse caldera formation in Gottsmann, J. and Marti, J. (editors) (2008) Caldera
Caldera
Volcanism: Analysis, Modelling and Response, Amsterdam, Elsevier. p. 319, citing Lipman, P. (2000). ^ Chauhan, M.; Bhattacharya, S.; Saran, S.; Chauhan, P.; Dagar, A. (2015). "Compton–Belkovich Volcanic Complex (CBVC): An ash flow caldera on the Moon". Icarus. 253: 115–29. Bibcode:2015Icar..253..115C. doi:10.1016/j.icarus.2015.02.024.  ^ Philip's World Reference Atlas including Stars and Planets ISBN 0-7537-0310-6 Publishing House Octopus publishing Group Ltd p. 9

Clough, C. T.; Maufe, H. B.; Bailey, E. B. (1909). "The Cauldron-Subsidence of Glen Coe, and the Associated Igneous Phenomena". Quarterly Journal of the Geological Society. 65 (1–4): 611–78. doi:10.1144/GSL.JGS.1909.065.01-04.35.  Gudmundsson, A (2008). Magma-Chamber Geometry, Fluid Transport, Local Stresses, and Rock Behavior During Collapse Caldera
Caldera
Formation. In Gottsmann J. & Marti, J (Ed. 10) Caldera
Caldera
Volcanism: Analysis, Modeling, and Response (314–46) Elsener, Amsterdam, The Netherlands Kokelaar, B. P; and Moore, I. D; 2006. Glencoe caldera volcano, Scotland. ISBN 9780852725252. Pub. British Geological Survey, Keyworth, Nottinghamshire. There is an associated 1:25000 solid geology map. Lipman, P; 1999. "Caldera". In Haraldur Sigurdsson, ed. Encyclopedia of Volcanoes. Academic Press. ISBN 0-12-643140-X Williams, H (1941). "Calderas and their origin". California
California
University Publ. Geol. Sci. 25: 239–346. 

External links[edit]

Wikimedia Commons has media related to Caldera.

Look up caldera in Wiktionary, the free dictionary.

USGS page on calderas List of Caldera
Caldera
Volcanoes Collection of references on collapse calderas (43 pages) The Caldera
Caldera
of the Tweed Volcano
Volcano
– Australia Largest Explosive Eruptions: New results for the 27.8 Ma Fish Canyon Tuff
Tuff
and the La Garita caldera, San Juan volcanic field, Colorado Supervolcanoes

v t e

Volcanoes

Volcano
Volcano
types

Caldera Cinder cone Complex volcano Cryovolcano Fissure vent Lava
Lava
cone Lava
Lava
dome Maar Mud volcano Parasitic cone Pyroclastic cone Pyroclastic shield Rootless cone Shield volcano Somma volcano Stratovolcano Subglacial volcano Submarine volcano Supervolcano Volcanic cone Volcanic field

polygenetic monogenetic

Volcanic rocks

Volcanic rock Agglomerate Andesite Basalt Basaltic andesite Benmoreite Blairmorite Dacite Felsite Komatiite Latite Leucitite Nephelinite Obsidian Phonolite Phonotephrite Rhyodacite Rhyolite Tephriphonolite Trachyte Trachyandesite Trachybasalt Tuff

List and volcanoes groups

Hotspot Lists of volcanoes Decade Volcanoes Volcanic arc Volcanic belt Volcanic field

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