Caldera#The Moon

The term caldera comes from Spanish {{Wikt-lang|es|caldera}}, and Latin {{Wikt-lang|la|caldaria}}, meaning "cooking pot".{{cite journal |last1=Cole |first1=J |last2=Milner |first2=D |last3=Spinks |first3=K |title=Calderas and caldera structures: a review |journal=Earth-Science Reviews |date=February 2005 |volume=69 |issue=1–2 |pages=1–26 |doi=10.1016/j.earscirev.2004.06.004|bibcode=2005ESRv...69....1C }} In some texts the English term cauldron is also used, though in more recent work the term cauldron refers to a caldera that has been deeply eroded to expose the beds under the caldera floor. The term caldera was introduced into the geological vocabulary by the German geologist Leopold von Buch when he published his memoirs of his 1815 visit to the Canary Islands,{{refn|group=note|name=note 1|Leopold von Buch's book Physical Description of the Canary Isles was published in 1825.}} where he first saw the Las Cañadas caldera on Tenerife, with Mount Teide dominating the landscape, and then the Caldera de Taburiente on La Palma.{{cite book |last1=von Buch |first1=L. |year=1820 |title=Ueber die Zusammensetzung der basaltischen Inseln und ueber Erhebungs-Cratere |location=Berlin |publisher=University of Lausanne

|url=https://books.google.com/books?id=-_sTAAAAQAAJ&q=von%20Buch%2C%20L.%201820.%20Uber%20die%20Zusammensetzung%20der%20Basaltischen%20Inseln%20und%20%C3%BCber%20Erhebungs%20Kratere.%20A%20lecture%20delivered%20before%20the%20Prussian%20Academy%20on%20Sciences%20in%20May%201818%2C%20Berlin.&pg=PA1 |access-date=28 December 2020}}

File:Origin of volcanic caldera via analogue model.gif

File:Toba zoom.jpg image of Lake Toba, on the island of Sumatra, 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.]]

File:Cagar Alam Rawa Danau Caldera.png

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{{cite web |last1=Greshko |first1=Michael |title=201 Years Ago, This Volcano Caused a Climate Catastrophe |url=https://www.nationalgeographic.com/news/2016/04/160408-tambora-eruption-volcano-anniversary-indonesia-science/ |archive-url=https://web.archive.org/web/20190926233008/https://www.nationalgeographic.com/news/2016/04/160408-tambora-eruption-volcano-anniversary-indonesia-science/ |url-status=dead |archive-date=26 September 2019 |website=National Geographic |date=8 April 2016 |access-date=2 September 2020}} in 1815), but also during effusive eruptions on the flanks of a volcano (see Piton de la Fournaise in 2007){{Cite gvp|vn=233020|title=Piton de la Fournaise|date=2019}} or in a connected fissure system (see 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 dikes.{{cite book |last1=Philpotts |first1=Anthony R. |last2=Ague |first2=Jay J. |title=Principles of igneous and metamorphic petrology |date=2009 |publisher=Cambridge University Press |location=Cambridge, UK |isbn=9780521880060 |edition=2nd}}{{rp|86–89}} Secondary volcanic vents may form above the ring fracture.{{cite book|last1=Dethier|first1=David P.|last2=Kampf|first2=Stephanie K.|title=Geology of the Jemez Region II|date=2007|publisher=Ne Mexico Geological Society|page=499 p|url=http://nmgs.nmt.edu/publications/guidebooks/58|access-date=6 November 2015|archive-date=17 October 2015|archive-url=https://web.archive.org/web/20151017020924/http://nmgs.nmt.edu/publications/guidebooks/58/|url-status=dead}} 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 of square kilometers.

Some calderas are known to host rich ore deposits. Metal-rich fluids can circulate through the caldera, forming hydrothermal ore deposits of metals such as lead, silver, gold, mercury, lithium, and uranium.{{cite journal |last1=John |first1=David A. |date=1 February 2008 |title=Supervolcanoes and Metallic Ore Deposits |url=https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=7b1980e74f0051da6ec9e46bbb4a20b5565696ba |url-status=live |journal=Elements |volume=4 |issue=1 |pages=22 |bibcode=2008Eleme...4...22J |citeseerx= |doi=10.2113/GSELEMENTS.4.1.22 |archive-url=https://web.archive.org/web/20250206153724/https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=7b1980e74f0051da6ec9e46bbb4a20b5565696ba |archive-date=6 February 2025}} One of the world's best-preserved mineralized calderas is the Sturgeon Lake Caldera in northwestern Ontario, Canada, which formed during the Neoarchean era{{cite web |title=Short Course and Field Investigations of Precambrian Volcanic Rocks, Hydrothermal Alteration, and Associated Mineral Deposits |url=http://www.d.umn.edu/prc/workshops/S08workshop.html |url-status=dead |archive-url=https://web.archive.org/web/20160304112337/http://www.d.umn.edu/prc/workshops/S08workshop.html |archive-date=4 March 2016 |access-date=2014-03-20 |publisher=Precambrian Research Center, University of Minnesota, Duluth |at=Field Trip |quote=In the Sturgeon Lake area of northwestern Ontario, one of the world’s best preserved mineralized Neoarchean caldera complexes will be investigated.}} about 2.7 billion years ago.{{cite web | title=Caldera volcanoes |publisher=University of Minnesota, Dultuh|first=Ron|last=Morton|date=18 March 2001 | url=http://www.d.umn.edu/~rmorton/ronshome/Volcanoes/calderas.html | archive-url=https://web.archive.org/web/20031102004227/http://www.d.umn.edu/~rmorton/ronshome/Volcanoes/calderas.html | archive-date=2 November 2003 | url-status=dead}} In the San Juan volcanic field, ore veins were emplaced in fractures associated with several calderas, with the greatest mineralization taking place near the youngest and most silicic intrusions associated with each caldera.{{cite journal |last1=Steven |first1=Thomas A. |last2=Luedke |first2=Robert G. |first3=Peter W. |last3=Lipman |title=Relation of mineralization to calderas in the San Juan volcanic field, southwestern Colorado |journal=J. Res. US Geol. Surv. |volume=2 |year=1974 |issue=4 |pages=405–409|bibcode=1974JRUGS...2..405S }}

{{Further|Explosive eruption}}

Explosive caldera eruptions are produced by a magma chamber whose magma is rich in silica. Silica-rich magma has a high viscosity, and therefore does not flow easily like basalt.{{rp|23–26}} The magma typically also contains a large amount of dissolved gases, up to 7 wt% for the most silica-rich magmas.{{cite book |last1=Schmincke |first1=Hans-Ulrich |title=Volcanism |date=2003 |publisher=Springer |location=Berlin |isbn=9783540436508 |pages=42–43}} When the magma approaches the surface of the Earth, the drop in confining pressure causes the trapped gases to rapidly bubble out of the magma, fragmenting the magma to produce a mixture of volcanic ash and other tephra with the very hot gases.{{sfn|Schmincke|2003|pp=155–157}}

The mixture of ash and volcanic gases initially rises into the atmosphere as an eruption column. However, as the volume of erupted material increases, the eruption column is unable to entrain enough air to remain buoyant, and the eruption column collapses into a tephra fountain that falls back to the surface to form pyroclastic flows.{{sfn|Schmincke|2003|p=157}} Eruptions of this type can spread ash over vast areas, so that ash flow tuffs emplaced by silicic caldera eruptions are the only volcanic product with volumes rivaling those of flood basalts.{{rp|77}} For example, when 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 in up to two metres of debris.{{cite web|first1=Jacob B. |last1=Lowenstern |first2=Robert L. |last2=Christiansen |first3=Robert B. |last3=Smith |first4=Lisa A. |last4=Morgan |first5=Henry |last5=Heasler |title=Steam Explosions, Earthquakes, and Volcanic Eruptions—What's in Yellowstone's Future? – U.S. Geological Survey Fact Sheet 2005–3024 |publisher=United States Geological Survey |date=May 10, 2005|url=http://pubs.usgs.gov/fs/2005/3024/}}

Eruptions forming even larger calderas are known, such as the La Garita Caldera in the San Juan Mountains of Colorado, where the {{convert|5000|km3}} Fish Canyon Tuff was blasted out in eruptions about 27.8 million years ago.{{cite web | url=http://www.livescience.com/11113-biggest-volcanic-eruption.html|title=What's the Biggest Volcanic Eruption Ever?| publisher=livescience.com | date=10 November 2010 | access-date=2014-02-01}}{{cite journal |last1=Best |first1=Myron G. |last2=Christiansen |first2=Eric H. |last3=Deino |first3=Alan L. |last4=Gromme |first4=Sherman |last5=Hart |first5=Garret L. |last6=Tingey |first6=David G. |title=The 36–18 Ma Indian Peak–Caliente ignimbrite field and calderas, southeastern Great Basin, USA: Multicyclic super-eruptions |journal=Geosphere |date=August 2013 |volume=9 |issue=4 |pages=864–950 |doi=10.1130/GES00902.1 |bibcode=2013Geosp...9..864B |doi-access=free }}

{{anchor|Outflow sheet}}

The caldera produced by such eruptions is typically filled in with tuff, rhyolite, and other igneous rocks.{{Cite journal|last1=Troll|first1=Valentin R.|last2=Emeleus|first2=C. Henry|last3=Donaldson|first3=Colin H.|date=2000-11-01|title=Caldera formation in the Rum Central Igneous Complex, Scotland|url=https://doi.org/10.1007/s004450000099|journal=Bulletin of Volcanology|language=en|volume=62|issue=4|pages=301–317|doi=10.1007/s004450000099|bibcode=2000BVol...62..301T|s2cid=128985944|issn=1432-0819}} The caldera is surrounded by an outflow sheet of ash flow tuff (also called an ash flow sheet).{{cite journal |last1=Best |first1=Myron G. |last2=Christiansen |first2=Eric H. |last3=Deino |first3=Alan L. |last4=Grommé |first4=C. Sherman |last5=Tingey |first5=David G. |title=Correlation and emplacement of a large, zoned, discontinuously exposed ash flow sheet: The 40 Ar/ 39 Ar chronology, paleomagnetism, and petrology of the Pahranagat Formation, Nevada |journal=Journal of Geophysical Research: Solid Earth |date=10 December 1995 |volume=100 |issue=B12 |pages=24593–24609 |doi=10.1029/95JB01690|bibcode=1995JGR...10024593B }}{{cite journal |last1=Cook |first1=Geoffrey W. |last2=Wolff |first2=John A. |last3=Self |first3=Stephen |title=Estimating the eruptive volume of a large pyroclastic body: the Otowi Member of the Bandelier Tuff, Valles caldera, New Mexico |journal=Bulletin of Volcanology |date=February 2016 |volume=78 |issue=2 |pages=10 |doi=10.1007/s00445-016-1000-0|bibcode=2016BVol...78...10C |s2cid=130061015 }}

If magma continues to be injected into the collapsed magma chamber, the center of the caldera may be uplifted in the form of a resurgent dome such as is seen at the Valles Caldera, Lake Toba, the San Juan volcanic field,{{cite journal |last1=Smith |first1=Robert L. |last2=Bailey |first2=Roy A. |title=Resurgent Cauldrons |journal=Geological Society of America Memoirs |date=1968 |volume=116 |pages=613–662 |doi=10.1130/MEM116-p613}} Cerro Galán,{{cite journal |last1=Grocke |first1=Stephanie B. |last2=Andrews |first2=Benjamin J. |last3=de Silva |first3=Shanaka L. |title=Experimental and petrological constraints on long-term magma dynamics and post-climactic eruptions at the Cerro Galán caldera system, NW Argentina |journal=Journal of Volcanology and Geothermal Research |date=November 2017 |volume=347 |pages=296–311 |doi=10.1016/j.jvolgeores.2017.09.021|bibcode=2017JVGR..347..296G |doi-access=free }} Yellowstone,{{cite journal |last1=Tizzani |first1=P. |last2=Battaglia |first2=M. |last3=Castaldo |first3=R. |last4=Pepe |first4=A. |last5=Zeni |first5=G. |last6=Lanari |first6=R. |title=Magma and fluid migration at Yellowstone Caldera in the last three decades inferred from InSAR, leveling, and gravity measurements |journal=Journal of Geophysical Research: Solid Earth |date=April 2015 |volume=120 |issue=4 |pages=2627–2647 |doi=10.1002/2014JB011502|bibcode=2015JGRB..120.2627T |doi-access=free |hdl=11573/779666 |hdl-access=free }} and many other calderas.

Because a silicic caldera may erupt hundreds or even thousands of cubic kilometers of material in a single event, it can cause catastrophic environmental effects. Even small caldera-forming eruptions, such as Krakatoa in 1883{{cite journal |last1=Schaller |first1=N |last2=Griesser |first2=T |last3=Fischer |first3=A |last4=Stickler |first4=A. and |last5=Brönnimann |first5=S. |year=2009 |title=Climate effects of the 1883 Krakatoa eruption: Historical and present perspectives |journal=VJSCHR. Natf. Ges. Zürich |volume=154 |pages=31–40 |url=https://www.researchgate.net/publication/255700466 |access-date=29 December 2020}} or Mount Pinatubo in 1991,{{cite journal |last1=Robock |first1=A. |title=PINATUBO ERUPTION: The Climatic Aftermath |journal=Science |date=15 February 2002 |volume=295 |issue=5558 |pages=1242–1244 |doi=10.1126/science.1069903|pmid=11847326 |s2cid=140578928 }} may result in significant local destruction and a noticeable drop in temperature around the world. Large calderas may have even greater effects. The ecological effects of the eruption of a large caldera can be seen in the record of the Lake Toba eruption in Indonesia.

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 Eocene Rum Complex of Scotland, the San Juan Mountains of Colorado (formed during the Oligocene, Miocene, and Pliocene epochs) or the Saint Francois Mountain Range of Missouri (erupted during the Proterozoic eon).{{cite book |last1=Kisvarsanyi |first1=Eva B. |title=Geology of the Precambrian St. Francois Terrane, Southeastern Missouri |date=1981 |publisher=Missouri Department of Natural Resources, Division of Geology and Land Survey |oclc=256041399 }}{{page needed|date=November 2019}}

File:Valle Caldera, New Mexico.jpg

{{Main|Valles Caldera}}

For their 1968 paper that first introduced the concept of a resurgent caldera to geology, R.L. Smith and R.A. Bailey chose the Valles caldera as their model. Although the Valles caldera is not unusually large, it is relatively young (1.25 million years old) and unusually well preserved,{{cite journal |last1=Goff |first1=Fraser |last2=Gardner |first2=Jamie N. |last3=Reneau |first3=Steven L. |last4=Kelley |first4=Shari A. |last5=Kempter |first5=Kirt A. |last6=Lawrence |first6=John R. |title=Geologic map of the Valles caldera, Jemez Mountains, New Mexico |journal=New Mexico Bureau of Geology and Mineral Resources Map Series |date=2011 |volume=79 |bibcode=2011AGUFM.V13C2606G |url=https://geoinfo.nmt.edu/publications/maps/geologic/gm/79/ |access-date=18 May 2020}} and it remains one of the best studied examples of a resurgent caldera. The ash flow tuffs of the Valles caldera, such as the Bandelier Tuff, were among the first to be thoroughly characterized.{{cite journal |last1=Ross |first1=Clarence S. |last2=Smith |first2=Robert L. |title=Ash-flow tuffs: Their origin, geologic relations, and identification |journal=U.S. Geological Survey Professional Paper |series=Professional Paper |date=1961 |volume=366 |page=7 |doi=10.3133/pp366|doi-access=free |bibcode=1961usgs.rept....7R |hdl=2027/ucbk.ark:/28722/h26b1t |hdl-access=free }}

{{Main|Lake Toba|Toba catastrophe theory}}

About 74,000 years ago, this Indonesian volcano released about {{convert|2800|km3}} dense-rock equivalent of ejecta. This was the largest known eruption during the ongoing Quaternary period (the last 2.6 million years) and the largest known explosive eruption during the last 25 million years. In the late 1990s, anthropologist Stanley Ambrose{{cite web | url=http://www.anthro.illinois.edu/people/ambrose | title=Stanley Ambrose page | publisher=University of Illinois at Urbana-Champaign | access-date=20 March 2014}} 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. More recently, Lynn Jorde and Henry Harpending proposed that the human species was reduced to approximately 5,000–10,000 people.[http://www.bbc.co.uk/science/horizon/1999/supervolcanoes_script.shtml Supervolcanoes], BBC2, 3 February 2000 There is no direct evidence, however, that either theory is correct, and there is no evidence for any other animal decline or extinction, even in environmentally sensitive species.{{cite journal |last1=Gathorne-Hardy |first1=F.J |last2=Harcourt-Smith |first2=W.E.H |title=The super-eruption of Toba, did it cause a human bottleneck? |journal=Journal of Human Evolution |date=September 2003 |volume=45 |issue=3 |pages=227–230 |doi=10.1016/s0047-2484(03)00105-2 |pmid=14580592 |bibcode=2003JHumE..45..227G }} There is evidence that human habitation continued in India after the eruption.{{cite journal |last1=Petraglia |first1=M. |last2=Korisettar |first2=R. |last3=Boivin |first3=N. |last4=Clarkson |first4=C. |last5=Ditchfield |first5=P. |last6=Jones |first6=S. |last7=Koshy |first7=J. |last8=Lahr |first8=M. M. |last9=Oppenheimer |first9=C. |last10=Pyle |first10=D. |last11=Roberts |first11=R. |last12=Schwenninger |first12=J.-L. |last13=Arnold |first13=L. |last14=White |first14=K. |title=Middle Paleolithic Assemblages from the Indian Subcontinent Before and After the Toba Super-Eruption |journal=Science |date=6 July 2007 |volume=317 |issue=5834 |pages=114–116 |doi=10.1126/science.1141564 |pmid=17615356 |bibcode=2007Sci...317..114P |s2cid=20380351 }}

File:La Cumbre - ISS.JPG in the Galápagos archipelago]]

File:Nemrut Caldera aerial.jpg, Van Lake, Eastern Turkey]]

File:Iss038e012569, Caldera Sollipulli.jpg Caldera, located in central Chile near the border with Argentina, filled with ice. The volcano is in the southern Andes Mountains within Chile's Parque Nacional Villarica.{{cite web | url=http://earthobservatory.nasa.gov/IOTD/view.php?id=82676 | title=EO | website=Earthobservatory.nasa.gov | access-date=20 March 2014| date=2013-12-23 }}]]

Some volcanoes, such as the large shield volcanoes Kīlauea and Mauna Loa 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 collapsed in 1968 when parts of the caldera floor dropped {{convert|350|m}}.{{cite gvp | vn=353010&vtab=Photos | title=Fernandina: Photo}}

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 crewed and uncrewed 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).{{Cite book | last1 = Parfitt | first1 = L. | last2 = Wilson | first2 = L. | title = Fundamentals of Physical Volcanology | url = https://archive.org/details/fundamentalsphys00parf | url-access = limited | place = Malden, MA | publisher = Blackwell Publishing| date= 19 February 2008| chapter = Volcanism on Other Planets| pages = [https://archive.org/details/fundamentalsphys00parf/page/n211 190]–212| chapter-url = http://google.com/books?id=ptpCiNkwLj8C&printsec=frontcover| isbn = 978-0-632-05443-5 | oclc = 173243845}} Caldera structure is similar on all of these planetary bodies, though the size varies considerably. The average caldera diameter on Venus is {{cvt|68|km|||}}. The average caldera diameter on Io is close to {{cvt|40|km|||}}, and the mode is {{cvt|6|km|||}}; Tvashtar Paterae is likely the largest caldera with a diameter of {{cvt|290|km|||}}. The average caldera diameter on Mars is {{cvt|48|km|||}}, smaller than Venus. Calderas on Earth are the smallest of all planetary bodies and vary from {{cvt|1.6–80|km|0||}} as a maximum.{{cite book |doi=10.1016/S1871-644X(07)00008-3 |chapter=Magma-Chamber Geometry, Fluid Transport, Local Stresses and Rock Behaviour During Collapse Caldera Formation |title=Caldera Volcanism: Analysis, Modelling and Response |volume=10 |pages=313–349 |series=Developments in Volcanology |year=2008 |last1=Gudmundsson |first1=Agust |isbn=978-0-444-53165-0 }}

{{Further|Volcanism on the Moon}}

The 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 are currently believed to have been formed by meteorites, nearly all of which took place in the first few hundred million years after the 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. 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 is thought to be a caldera, possibly an ash-flow caldera.{{cite journal |last1=Chauhan |first1=M. |last2=Bhattacharya |first2=S. |last3=Saran |first3=S. |last4=Chauhan |first4=P. |last5=Dagar |first5=A. |title=Compton–Belkovich Volcanic Complex (CBVC): An ash flow caldera on the Moon |journal=Icarus |date=June 2015 |volume=253 |pages=115–129 |doi=10.1016/j.icarus.2015.02.024 |bibcode=2015Icar..253..115C }}

{{Further|Volcanism on Mars}}

The volcanic activity of Mars is concentrated in two major provinces: 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. Mars has the tallest 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.Philip's World Reference Atlas including Stars and Planets {{ISBN|0-7537-0310-6}} Publishing House Octopus publishing Group Ltd p. 9

{{Further|Volcanism on 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 {{cvt|150–400|km|round=5||}} in diameter and {{cvt|2–4|km|||}} high. More than 80 of these large shield volcanoes have summit calderas averaging {{cvt|60|km|||}} across.

{{Further|Volcanism on Io}}

Io, unusually, is heated by solid flexing due to the tidal influence of Jupiter and Io's orbital resonance with neighboring large moons Europa and Ganymede, which keep its orbit slightly eccentric. Unlike any of the planets mentioned, Io is continuously volcanically active. For example, the NASA Voyager 1 and Voyager 2 spacecraft detected nine erupting volcanoes while passing Io in 1979. Io has many calderas with diameters tens of kilometers across.

{{See also|Category:Calderas}}

File:Nabro and Mallahle Volcanoes-NASA.jpg topographical relief image of Nabro (top) and Mallahle volcanic calderas (centre left)]]

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

File:Deception island.jpg by Sentinel-2 (March 2023)]]

• Deception Island
• Kemp Caldera

File:Mount Tambora Volcano, Sumbawa Island, Indonesia.jpg]]

File:Pinatubo92pinatubo caldera crater lake.jpg, Philippines]]

• China
• Dakantou Caldera (大墈头) (Shanhuyan Village, Taozhu Town, Linhai, Zhejiang)
• Ma'anshan Caldera (马鞍山) (Shishan Town (石山镇), Xiuying, Hainan)
• Yiyang Caldera (宜洋) (Shuangxi Town (双溪镇宜洋村), Pingnan County, Fujian)
• Indonesia
• Batur (Bali)
• Krakatoa (Sunda Strait)
• Lake Maninjau (Sumatra)
• Lake Toba (Sumatra)
• Mount Rinjani (Lombok)
• Mount Tondano (Sulawesi)
• Mount Tambora (Sumbawa)
• Tengger Caldera (Java)
• Japan
• Aira Caldera (Kagoshima Prefecture)
• Kussharo (Hokkaido)
• Kuttara (Hokkaido)
• Mashū (Hokkaido)
• Aso Caldera, Mount Aso (Kumamoto Prefecture)
• Kikai Caldera (Kagoshima Prefecture)
• Towada (Aomori Prefecture)
• Tazawa (Akita Prefecture)
• Hakone (Kanagawa Prefecture)
• Korean Peninsula
• Mount Halla (Jeju-do, South Korea)
• Heaven Lake (Baekdu Mountain, North Korea/Changbai Mountains, China)
• Philippines
• Apolaki Caldera (Benham Rise)
• Corregidor Caldera (Manila Bay)
• Mount Pinatubo (Luzon)
• Taal Volcano (Luzon)
• Laguna Caldera (Luzon)
• Irosin Caldera (Luzon)
• Turkey
• Derik (Mardin)
• Nemrut (volcano)
• Russia File:Yankicha.jpg, Kuril Islands]]
• Akademia Nauk (Kamchatka Peninsula)
• Golovnin (Kuril Islands)
• Karymsky Caldera (Kamchatka Peninsula)
• Karymshina (Kamchatka Peninsula)
• Khangar (Kamchatka Peninsula)
• Ksudach (Kamchatka Peninsula)
• Kurile Lake (Kamchatka Peninsula)
• Pauzhetka caldera (hosts Kurile Lake caldera, Kamchatka Peninsula){{cite web |title = Diky Greben|url = https://volcano.si.edu/volcano.cfm?vn=300022 |date=2022-03-15 }}
• Lvinaya Past (Kuril Islands)
• Tao-Rusyr Caldera (Kuril Islands)
• Uzon (Kamchatka Peninsula)
• Zavaritski Caldera (Kuril Islands)
• Yankicha/Ushishir (Kuril Islands)
• Chegem Caldera (Kabardino-Balkarian Republic, North Caucasus)

File:Santorini 3D version 1.gif aerial spinning view over Santorini, Greece]] File:Laacher_See_-_Luftaufnahme.jpg, Germany]] File:Cratere degli Astroni visto dall'alto.jpg near Naples, Italy]] File:Caldeira Faial ca 580 m.ü.NN. Kesselboden.JPG, Faial Island, Azores]]

• Georgia
• Bakuriani/Didveli Caldera
• Samsari
• Germany
• Laacher See
• Greece
• Santorini
• Nisyros
• Iceland
• Askja
• Grímsvötn
• Bárðarbunga
• Katla
• Krafla
• Italy
• Phlegraean Fields
• Lake Bracciano
• Lake Bolsena
• Mount Somma which contains Mount Vesuvius
• Portugal
• Lagoa das Sete Cidades & Furnas (São Miguel, the Azores)
• Caldeira do Faial (Faial)
• Caldeirão do Corvo (Corvo)
• United Kingdom
• Glen Coe (Scotland)
• Scafell Caldera (Lake District, England){{Cite web | url=http://earthwise.bgs.ac.uk/index.php/Borrowdale_Volcanic_Group,_upper_silicic_eruptive_phase,_Caradoc_magmatism,_Ordovician,_Northern_England | title=Borrowdale Volcanic Group, upper silicic eruptive phase, Caradoc magmatism, Ordovician, Northern England – Earthwise}}
• Slovakia
• Banská Štiavnica
• Spain
• Las Cañadas (Tenerife, Canary Islands)

File:Teopan.jpg, El Salvador crater lake]]

File:Crater lake oregon.jpg, Oregon, formed around 5,680 BC]]

File:Aniakchak-caldera alaska.jpg-caldera, Alaska]]

• Canada
• Silverthrone Caldera (British Columbia)
• Mount Edziza (British Columbia)
• Bennett Lake Volcanic Complex (British Columbia/Yukon)
• Mount Pleasant Caldera (New Brunswick)
• Sturgeon Lake Caldera (Ontario)
• Mount Skukum Volcanic Complex (Yukon)
• Blake River Megacaldera Complex (Quebec/Ontario)
• New Senator Caldera (Quebec)
• Misema Caldera (Ontario/Quebec)
• Noranda Caldera (Quebec)
• Mexico
• La primavera Caldera (Jalisco)
• Amealco Caldera (Querétaro)
• Las Cumbres Caldera (Veracruz-Puebla)
• Los Azufres Caldera (Michoacán)
• Los Humeros Caldera (Veracruz-Puebla)
• Mazahua Caldera (Mexico State)
• El Salvador
• Lake Ilopango
• Lake Coatepeque
• Guatemala
• Lake Amatitlán
• Lake Atitlán
• Xela
• Barahona
• Nicaragua
• Masaya (Nicaragua)
• United States
• Mount Aniakchak (Aniakchak National Monument and Preserve) (Alaska)
• Cochetopa Caldera (Colorado)
• Crater Lake on Mount Mazama (Crater Lake National Park, Oregon)
• Mount Katmai (Alaska)
• Kīlauea (Hawaii)
• Mauna Loa (Hawaii)
• La Garita Caldera (Colorado)
• Long Valley (California)
• Henry's Fork Caldera (Idaho)
• Island Park Caldera (Idaho, Wyoming)
• Newberry Volcano (Oregon)
• McDermitt Caldera (Oregon)
• Medicine Lake Volcano (California)
• Mount Okmok (Alaska)
• Valles Caldera (New Mexico)
• Yellowstone Caldera (Wyoming)

• Cirque de Cilaos (Réunion)
• Cirque de Mafate (Réunion)
• Cirque de Salazie (Réunion)
• Enclos Fouqué (Réunion)

File:Mokuaweoweo from the air.gif's summit caldera, covered in snow]]

File:Lake taupo landsat.jpg]]

• Australia
• Cerberean Cauldron{{cite journal |last1=Clemens |first1=J.D. |last2=Birch |first2=W.D. |title=Assembly of a zoned volcanic magma chamber from multiple magma batches: The Cerberean Cauldron, Marysville Igneous Complex, Australia |journal=Lithos |date=December 2012 |volume=155 |pages=272–288 |doi=10.1016/j.lithos.2012.09.007 |bibcode=2012Litho.155..272C }}
• Mount Warning
• Prospect Hill
• Hawaii
• Kilauea (Hawaii, US)
• Moku‘āweoweo Caldera on Mauna Loa (Hawaii, US)
• New Zealand
• Kapenga
• Lake Ohakuri
• Lake Okataina
• Lake Rotorua
• Lake Taupō
• Maroa
• Otago Harbour
• Reporoa caldera
• Papua New Guinea
• Dakataua
• Polynesia
• Rano Kau (Easter Island, Chile)

File:Sollipulli Caldera, Southern Chile.jpg caldera, looking east]]

• Argentina
• Aguas Calientes, Salta Province
• Caldera del Atuel, Mendoza Province
• Galán, Catamarca Province
• Bolivia
• Pastos Grandes
• Colombia
• Arenas crater caldera, Nevado del Ruiz volcano, Caldas Department
• Laguna Verde caldera, Azufral volcano, Narino Department
• Chile
• Chaitén
• Cordillera Nevada Caldera
• Laguna del Maule
• Pacana Caldera
• Sollipulli
• Ecuador
• Pululahua Geobotanical Reserve
• Cuicocha
• Quilotoa
• Fernandina Island, Galápagos Islands
• Sierra Negra (Galápagos)
• Chacana Caldera

• Mars
• Olympus Mons caldera
• Venus
• Maat Mons caldera

• Americas
• Guaichane-Mamuta (Chile)
• Mount Tehama (California, US)
• Europe
• Caldera de Taburiente (Spain)
• Oceania
• Tweed Valley (New South Wales, Queensland, Australia)
• Asia
• Chegem Caldera (Kabardino-Balkarian Republic, Northern Caucasus Region, Russia)
• Taal volcano (Philippines) Batangas Province

• {{annotated link|Complex volcano}}
• {{annotated link|Maar}}
• {{annotated link|Somma volcano}}
• {{annotated link|Supervolcano}}
• {{annotated link|Volcanic Explosivity Index}}

{{Reflist|group=note}}

{{Reflist}}

• {{cite journal|last1=Clough|first1=C. T.|last2=Maufe|first2=H. B.|last3=Bailey|first3=E. B.|title=The Cauldron-Subsidence of Glen Coe, and the Associated Igneous Phenomena|journal=Quarterly Journal of the Geological Society|date=1909|volume=65|issue=1–4|pages=611–78|doi=10.1144/GSL.JGS.1909.065.01-04.35|bibcode=1909QJGS...65..611C |s2cid=129342758|url=https://zenodo.org/record/2346903}}
• {{cite book |doi=10.1016/S1871-644X(07)00008-3 |chapter=Magma-Chamber Geometry, Fluid Transport, Local Stresses and Rock Behaviour During Collapse Caldera Formation |title=Caldera Volcanism: Analysis, Modelling and Response |volume=10 |pages=313–349 |series=Developments in Volcanology |year=2008 |last1=Gudmundsson |first1=Agust |isbn=978-0-444-53165-0 }}
• 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}}
• {{cite journal |last1=Williams |first1=Howell |title=Calderas and their origin |journal=University of California Publications Bulletin of the Department of Geological Sciences |date=1941 |volume=25 |pages=239–346 |url=https://babel.hathitrust.org/cgi/pt?id=mdp.39015027553265&view=1up&seq=291 }}

{{Commons category|Calderas}}

{{Wiktionary|caldera}}

• [http://volcanoes.usgs.gov/images/pglossary/caldera.php USGS page on calderas]
• [https://web.archive.org/web/20110717230952/http://www.volcanodb.com/search.php?type=Caldera List of Caldera Volcanoes]
• [https://web.archive.org/web/20070630233550/http://eis.bris.ac.uk/~gljhg/Workgroup/Workgroup_files/Edited-list-publications_calderas-71206.pdf Collection of references on collapse calderas] (43 pages)
• [http://www.bigvolcano.com.au/natural/wollum.htm The Caldera of the Tweed Volcano – Australia]
• [https://web.archive.org/web/20051216160300/http://host.uniroma3.it/progetti/cev/Web%20CEV%20folder/lagarita.html Largest Explosive Eruptions: New results for the 27.8 Ma Fish Canyon Tuff and the La Garita caldera, San Juan volcanic field, Colorado]
• [http://www.bbc.co.uk/science/horizon/1999/supervolcanoes_script.shtml Supervolcanoes]
• [https://www.youtube.com/watch?v=mIK6l5vNT8o Time-lapse video of Kīlauea caldera collapse, 2018]

{{Earth's landforms}}

{{Volcanoes}}

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Category:Depressions (geology)

Category:Igneous rocks

Category:Volcanism

Category:Volcanic landforms

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