Mud volcano

A mud volcano or mud dome is a landform created by the eruption of mud or slurries, water and gases.[1][2][3] Several geological processes may cause the formation of mud volcanoes. Mud volcanoes are not true igneous volcanoes as they do not produce lava and are not necessarily driven by magmatic activity. The Earth continuously exudes a mud-like substance, which may sometimes be referred to as a "mud volcano". Mud volcanoes may range in size from merely 1 or 2 meters high and 1 or 2 meters wide, to 700 meters high and 10 kilometers wide.[4] Smaller mud exudations are sometimes referred to as mud-pots.

A group of mud volcanoes in Gobustan, Azerbaijan
Mud volcano in the Gulf of Mexico sea bottom
Hydrate-bearing sediments, which often are associated with mud volcano activity. Source: USGS, 1996.
The geothermal phenomena known as "mud volcanoes" are often not true mud volcanoes (pelovolcano). See mudpot for further information.

The mud produced by mud volcanoes is mostly formed as hot water, which has been heated deep below the Earth's surface, begins to mix and blend with subterranean mineral deposits, thus creating the mud slurry exudate. This material is then forced upwards through a geological fault or fissure due to local subterranean pressure imbalances. Mud volcanoes are associated with subduction zones and about 1100 have been identified on or near land. The temperature of any given active mud volcano generally remains fairly steady and is much lower than the typical temperatures found in igneous volcanoes. Mud volcano temperatures can range from near 100 °C (212 °F) to occasionally 2 °C (36 °F), some being used as popular "mud baths".

About 86% of the gas released from these structures is methane, with much less carbon dioxide and nitrogen emitted. Ejected materials are most often a slurry of fine solids suspended in water that may contain a mixture of salts, acids and various hydrocarbons.

Possible mud volcanoes have been identified on Mars.[5]

Details

A mud volcano may be the result of a piercement structure created by a pressurized mud diapir that breaches the Earth's surface or ocean bottom. Their temperatures may be as low as the freezing point of the ejected materials, particularly when venting is associated with the creation of hydrocarbon clathrate hydrate deposits. Mud volcanoes are often associated with petroleum deposits and tectonic subduction zones and orogenic belts; hydrocarbon gases are often erupted. They are also often associated with lava volcanoes; in the case of such close proximity, mud volcanoes emit incombustible gases including helium, whereas lone mud volcanoes are more likely to emit methane.

Approximately 1,100 mud volcanoes have been identified on land and in shallow water. It has been estimated that well over 10,000 may exist on continental slopes and abyssal plains.

Features
  • Gryphon: steep-sided cone shorter than 3 meters that extrudes mud
  • Mud cone: high cone shorter than 10 meters that extrudes mud and rock fragments
  • Scoria cone: cone formed by heating of mud deposits during fires
  • Salse: water-dominated pools with gas seeps
  • Spring: water-dominated outlets smaller than 0.5 metres
  • Mud shield

Emissions

Most liquid and solid material is released during eruptions, but seeps occur during dormant periods.

The mud is rich in halite (rock salt).

First-order estimates of mud volcano emissions have been made (1 Tg = 1 million metric tonnes).

  • 2002: L. I. Dimitrov estimated that 10.2–12.6 Tg/yr of methane is released from onshore and shallow offshore mud volcanoes.
  • 2002: Etiope and Klusman estimated at least 1–2 and as much as 10–20 Tg/yr of methane may be emitted from onshore mud volcanoes.
  • 2003: Etiope, in an estimate based on 120 mud volcanoes: "The emission results to be conservatively between 5 and 9 Tg/yr, that is 3–6% of the natural methane sources officially considered in the atmospheric methane budget. The total geologic source, including MVs (this work), seepage from seafloor (Kvenvolden et al., 2001), microseepage in hydrocarbon-prone areas and geothermal sources (Etiope and Klusman, 2002), would amount to 35–45 Tg/yr."[6]
  • 2003: analysis by Milkov et al. suggests that the global gas flux may be as high as 33 Tg/yr (15.9 Tg/yr during quiescent periods plus 17.1 Tg/yr during eruptions). Six teragrams per year of greenhouse gases are from onshore and shallow offshore mud volcanoes. Deep-water sources may emit 27 Tg/yr. Total may be 9% of fossil CH4 missing in the modern atmospheric CH4 budget, and 12% in the preindustrial budget.[7]
  • 2003: Alexei Milkov estimated approximately 30.5 Tg/yr of gases (mainly methane and CO2) may escape from mud volcanoes to the atmosphere and the ocean.[8]
  • 2003: Achim J. Kopf estimated 1.97×1011 to 1.23×1014 m³ of methane is released by all mud volcanoes per year, of which 4.66×107 to 3.28×1011 m³ is from surface volcanoes.[9] That converts to 141–88,000 Tg/yr from all mud volcanoes, of which 0.033–235 Tg is from surface volcanoes.

Locations

Europe
Two mud volcanoes on the Taman Peninsula near Taman Stanitsa, Russia

Dozens of mud volcanoes can be found on the Taman Peninsula of Russia and the Kerch Peninsula of Crimea along with the south-western portion of Bulgaria near Rupite. In Italy, they are common in the northern front of the Apennines and in Sicily. On August 24, 2013, a mud volcano appeared in the centre of the via Coccia di Morto roundabout in Fiumicino near Rome.[10][11]

Mud volcanoes can be found in the Berca Mud Volcanoes near Berca in Buzău County, Romania, close to the Carpathian Mountains.

Asia

Indonesia

Mud volcanism is a common phenomena in Indonesia with dozens of structures present onshore and offshore.[12][13]

The Indonesian Lusi mud eruption is a hybrid mud volcano, driven by pressure from steam and gas from a nearby (igneous) volcanic system, and from natural gas. Geochemical, petrography and geophysical results reveal that it is a sediment-hosted hydrothermal system connected at depth with the neighboring Arjuno Welirang volcanic complex.[14][15][16][17][18]

Drilling or an earthquake[19][20] in the Porong subdistrict of East Java province, Indonesia, may have resulted in the Sidoarjo mud flow on May 29, 2006,.[21][22][23] The mud covered about 440 hectares, 1,087 acres (4.40 km2) (2.73 mi2), and inundated four villages, homes, roads, rice fields, and factories, displacing about 24,000 people and killing 14. The gas exploration company involved was operated by PT Lapindo Brantas and the earthquake that may have triggered the mud volcano was the 6.3 magnitude Yogyakarta earthquake of May 27, 2006. According to geologists who have been monitoring Lusi and the surrounding area, the system is beginning to show signs of catastrophic collapse. It was forecasted that the region could sag the vent and surrounding area by up to 150 metres (490 ft) in the next decade. In March 2008, the scientists observed drops of up to 3 metres (9.8 ft) in one night. Most of the subsidence in the area around the volcano is more gradual, at around 1 millimetre (0.039 in) per day. A study by a group of Indonesian geo-scientists led by Bambang Istadi predicted the area affected by the mudflow over a ten-year period.[24] More recent studies carried out in 2011 predict that the mud will flow for another 20 years, or even longer.[25] Now named Lusi – a contraction of Lumpur Sidoarjo, where lumpur is the Indonesian word for "mud" – the eruption represent an active hybrid system.

In the Suwoh depression in Lampung, dozens of mud cones and mudpots varying in temperature are found.

Central Asia

Many mud volcanoes exist on the shores of the Black Sea and Caspian Sea. Tectonic forces and large sedimentary deposits around the latter have created several fields of mud volcanoes, many of them emitting methane and other hydrocarbons. Features over 200 metres (656 ft) high occur in Azerbaijan, with large eruptions sometimes producing flames of similar scale. There are mud volcanoes in Georgia, such as the one at Akhtala.

Iran and Pakistan possess mud volcanoes in the Makran range of mountains in the south of the two countries. A large mud volcano is located in Balochistan, Pakistan. It is known as Baba Chandrakup (literally Father Moonwell) on the way to Hinglaj and is a Hindu pilgrim site.[26]

Azerbaijan
Mud volcanoes in Gobustan, Azerbaijan
  • Azerbaijan and its Caspian coastline are home to nearly 400 mud volcanoes, more than half the total throughout the continents.[27] In 2001, one mud volcano 15 kilometres (9 mi) from Baku made world headlines when it started ejecting flames 15 metres (49 ft) high.[28]
  • In Azerbaijan, eruptions are driven from a deep mud reservoir which is connected to the surface even during dormant periods, when seeping water shows a deep origin. Seeps have temperatures that are generally above ambient ground temperature by 2 °C (3.6 °F) – 3 °C (5.4 °F).[29] Lökbatan Mud Volcano since 1998 submitted to UNESCO's World Heritage Site tentative list.[30]
  • In 2017 CNN Travel included the Gobustan State Reserve in its list of 50 natural wonders of the world.[31]

India

Baratang island, part of the Great Andaman archipelago in the Andaman Islands, Indian Ocean, has several sites of mud volcanic activity.

Iran
Mud volcano in Hormozgan Province, southern Iran

There are many mud volcanoes in Iran: in particular, in the provinces of Golestan, Hormozgan, and Sistan and Baluchestan, where Pirgel is located.

Pakistan
Satellite image of mud volcanoes in Pakistan

In Pakistan there are more than 80 active mud volcanoes in Balochistan province; there are about 10 locations with clusters of mud volcanoes. In the west, in Gwadar District, the mud volcanoes are very small and mostly sit in the south of Jabal-e-Mehdi toward Sur Bandar. Many more are in the northeast of Ormara. The remainder are in Lasbela District and are scattered between south of Gorangatti on Koh Hinglaj to Koh Kuk in the North of Miani Hor in the Hangol Valley. In this region, the heights of mud volcanoes range between 800 to 1,550 feet (243.8 to 472.4 m). The most famous is Chandragup. The biggest crater found at 25°33'13.63"N. 65°44'09.66"E is about 450 feet (137.16 m) in diameter. Most mud volcanoes in this region are in out-of-reach areas having very difficult terrain. Dormant mud volcanoes stand like columns of mud in many other areas.

Philippines

In the Turtle Islands, in the province of Tawi-Tawi, the southwestern edge of the Philippines bordering Malaysia, presence of mud volcanoes are evident on three of the islands – Lihiman, Great Bakkungan and Boan Islands. The northeastern part of Lihiman Island is distinguished for having a more violent kind of mud extrusions mixed with large pieces of rocks, creating a 20-m (66-ft) wide crater on that hilly part of the island.[32] Such extrusions are reported to be accompanied by mild earthquakes and evidence of extruded materials can be found high in the surrounding trees. Submarine mud extrusions off the island have been observed by local residents.[33]

Other Asian locations
Mud volcano landscape at Oesilo, Oecusse District, Timor-Leste
  • China has a number of mud volcanoes in Xinjiang province.
  • There are mud volcanoes at the Minn Buu Township, Magway division in Myanmar (Burma).
  • There are two active mud volcanoes in South Taiwan and several inactive ones. The Wushan Mud Volcanoes are in the Yanchao District of Kaohsiung City. There are active mud volcanoes in Wandan township of Pingtung County.
  • There are mud volcanoes on the island of Pulau Tiga, off the western coast of the Malaysian state of Sabah on Borneo.
  • The Meritam Volcanic Mud, locally called the 'lumpur bebuak', located about 35 km from Limbang, Sarawak, Malaysia is a tourist attraction.[34]
  • A drilling accident offshore of Brunei on Borneo in 1979 caused a mud volcano which took 20 relief wells and nearly 30 years to halt.
  • Active mud volcanoes occur in Oesilo (Oecusse District, East Timor). A mud volcano in Bibiluto (Viqueque District) erupted between 1856 and 1879.[35]

North America
A cold mud pot in Northern California, showing the scale
A cold mud pot in Glenblair, California
Aerial view of mud volcanoes on the Nahlin Plateau, British Columbia. Scale – each volcano approximately 20 m in diameter.

Mud volcanoes of the North American continent include:

  • A field of small (<2 metres (6.6 ft) high) fault-controlled, cold mud volcanoes is on California's Mendocino Coast, near Glenblair and Fort Bragg, California. The fine-grained clay is occasionally harvested by local potters.[36]
  • Shrub and Klawasi mud volcanoes in the Copper River basin by the Wrangell Mountains, Alaska. Emissions are mostly CO2 and nitrogen; the volcanoes are associated with magmatic processes.
  • An unnamed mud volcano 30 metres (98 ft) high and with a top about 100 metres (328 ft) wide, 24 kilometres (15 mi) off Redondo Beach, California, and 800 metres (2,620 ft) under the surface of the Pacific Ocean.
  • A field of small (<3 metres (9.8 ft)) mud volcanoes in the Salton Sea geothermal area near the town of Niland, California.[37] Emissions are mostly CO2. One, known as the Niland Geyser, continues to move erratically.[38]
  • Smooth Ridge mud volcano in 1,000 metres (3,280 ft) of water near Monterey Canyon, California.
  • Kaglulik mud volcano, 43 metres (141 ft) under the surface of the Beaufort Sea, near the northern boundary of Alaska and Canada. Petroleum deposits are believed to exist in the area.
  • Maquinna mud volcano, located 16–18 kilometres (9.9–11.2 mi) west of Vancouver Island, British Columbia, Canada.

Yellowstone's "Mud Volcano"
Yellowstone's "Mud Volcano"[39]

The name of Yellowstone National Park's "Mud Volcano" feature and the surrounding area is misleading; it consists of hot springs, mud pots and fumaroles, rather than a true mud volcano. Depending upon the precise definition of the term mud volcano, the Yellowstone formation could be considered a hydrothermal mud volcano cluster. The feature is much less active than in its first recorded description, although the area is quite dynamic. Yellowstone is an active geothermal area with a magma chamber near the surface, and active gases are chiefly steam, carbon dioxide, and hydrogen sulfide.

However, there are mud volcanoes and mud geysers elsewhere in Yellowstone.[40] One, the "Vertically Gifted Cyclic Mud Pot" sometimes acts as a geyser, throwing mud up to 30 feet high.

The mud volcano in Yellowstone was previously a mound until a thermal explosion in the 1800s ripped it apart.[41]

Caribbean
Photo of mud volcano in southern Trinidad c. 1967
One of the Devil's Woodyard Volcano (Trinidad & Tobago)
  • There are many mud volcanoes in Trinidad and Tobago in the Caribbean, near oil reserves in southern parts of the island of Trinidad. As of August 15, 2007, the mud volcano titled the Moruga Bouffle was said to being spitting up methane gas which shows that it is active. There are several other mud volcanoes in the tropical island which include:
    • the Devils Woodyard mud volcano near Trinidad and Tobago
    • the Moruga Bouffe mud volcano near Moruga
    • the Piparo mud volcano
    • the Chatham mud volcano underwater in the Columbus Channel; this mud volcano periodically produces a short-lived island.
    • the Erin Bouffe mud volcano near Los Iros beach
    • L'eau Michel mud volcano in Bunsee Trace, Penal
  • A number of large mud volcanoes have been identified on the Barbados accretionary complex, offshore Barbados.[42]

South America

Venezuela
Yagrumito mud volcano in Monagas, Venezuela (6 km from Maturín)

The eastern part of Venezuela contains several mud volcanoes (or mud domes), all of them having an origin related to oil deposits. The mud of 6 kilometres (3.7 mi) from Maturín, contains water, biogenic gas, hydrocarbons and an important quantity of salt. Cattle from the savanna often gather around to lick the dried mud for its salt content.

Colombia

Volcan El Totumo,[43] which marks the division between Bolívar and Atlantico in Colombia. This volcano is approximately 50 feet (15 m) high and can accommodate 10 to 15 people in its crater; many tourists and locals visit this volcano due to the alleged medicinal benefits of the mud; it is next to a cienaga, or lake. This volcano is under legal dispute between the Bolívar and Atlántico Departamentos because of its tourist value.

See also

References
  1. Mazzini, Adriano; Etiope, Giuseppe (2017). "Mud volcanism: An updated review". Earth-Science Reviews. 168: 81–112. doi:10.1016/j.earscirev.2017.03.001. hdl:10852/61234. ISSN 0012-8252.
  2. Kopf, Achim J. (2002). "Significance of mud volcanism". Reviews of Geophysics. 40 (2): 1005. Bibcode:2002RvGeo..40.1005K. doi:10.1029/2000rg000093. ISSN 8755-1209.
  3. Dimitrov, Lyobomir I (2002). "Mud volcanoes—the most important pathway for degassing deeply buried sediments". Earth-Science Reviews. 59 (1–4): 49–76. Bibcode:2002ESRv...59...49D. doi:10.1016/s0012-8252(02)00069-7. ISSN 0012-8252.
  4. Kioka, Arata; Ashi, Juichiro (28 October 2015). "Episodic massive mud eruptions from submarine mud volcanoes examined through topographical signatures". Geophysical Research Letters. 42 (20): 8406–8414. Bibcode:2015GeoRL..42.8406K. doi:10.1002/2015GL065713.
  5. "Mars domes may be 'mud volcanoes'". BBC. March 26, 2009. Retrieved 2009-03-27.
  6. Etiope, Giuseppe (2003). "A new estimate of global methane flux from onshore and shallow submarine mud volcanoes". Geological Society of America Abstracts with Programs. p. 115. "A new estimate of global methane flux from onshore and shallow submarine mud volcanoes". XVI INQUA Congress. Archived from the original on September 4, 2006. Retrieved April 20, 2005.
  7. Milkov, A. V., R. Sassen, T. V. Apanasovich, and F. G. Dadashev (2003). "Global gas flux from mud volcanoes: A significant source of fossil methane in the atmosphere and the ocean". Geophys. Res. Lett. 30 (2): 1037. Bibcode:2003GeoRL..30.1037M. doi:10.1029/2002GL016358.CS1 maint: multiple names: authors list (link)
  8. "Global Distribution and Significance of Mud Volcanoes". AAPG Annual Meeting 2003: Energy – Our Monumental Task. Archived from the original on November 18, 2005. Retrieved April 20, 2005.
  9. Achim J. Kopf (2003). "Global methane emission through mud volcanoes and its past and present impact on the Earth's climate". International Journal of Earth Sciences. 92 (5): 806–816. Bibcode:2003IJEaS..92..806K. doi:10.1007/s00531-003-0341-z. ISSN 1437-3254 (Paper) ISSN 1437-3262 (Online)
  10. "Mini volcano pops up in Rome". 2013-08-28.
  11. "Il mini- vulcano con eruzioni fino a tre metri".
  12. Satyana, A.H. (2008). "Mud diapirs and mud volcanoes in depressions of Java to Madura : origins, natures, and implicatons to petroleum system". Proc. Indon Petrol. Assoc., 32nd Ann. Conv. doi:10.29118/ipa.947.08.g.139.
  13. Mazzini, A.; Nermoen, A.; Krotkiewski, M.; Podladchikov, Y.; Planke, S.; Svensen, H. (2009). "Strike-slip faulting as a trigger mechanism for overpressure release through piercement structures. Implications for the Lusi mud volcano, Indonesia". Marine and Petroleum Geology. 26 (9): 1751–1765. doi:10.1016/j.marpetgeo.2009.03.001. ISSN 0264-8172.
  14. Mazzini, Adriano; Scholz, Florian; Svensen, Henrik H.; Hensen, Christian; Hadi, Soffian (2018). "The geochemistry and origin of the hydrothermal water erupted at Lusi, Indonesia" (PDF). Marine and Petroleum Geology. 90: 52–66. doi:10.1016/j.marpetgeo.2017.06.018. ISSN 0264-8172.
  15. Inguaggiato, Salvatore; Mazzini, Adriano; Vita, Fabio; Sciarra, Alessandra (2018). "The Arjuno-Welirang volcanic complex and the connected Lusi system: Geochemical evidences". Marine and Petroleum Geology. 90: 67–76. doi:10.1016/j.marpetgeo.2017.10.015. ISSN 0264-8172.
  16. Malvoisin, Benjamin; Mazzini, Adriano; Miller, Stephen A. (2018). "Deep hydrothermal activity driving the Lusi mud eruption". Earth and Planetary Science Letters. 497: 42–49. Bibcode:2018E&PSL.497...42M. doi:10.1016/j.epsl.2018.06.006. ISSN 0012-821X.
  17. Mazzini, Adriano; Etiope, Giuseppe; Svensen, Henrik (2012). "A new hydrothermal scenario for the 2006 Lusi eruption, Indonesia. Insights from gas geochemistry". Earth and Planetary Science Letters. 317–318: 305–318. Bibcode:2012E&PSL.317..305M. doi:10.1016/j.epsl.2011.11.016. ISSN 0012-821X.
  18. Fallahi, Mohammad Javad; Obermann, Anne; Lupi, Matteo; Karyono, Karyono; Mazzini, Adriano (2017). "The Plumbing System Feeding the Lusi Eruption Revealed by Ambient Noise Tomography". Journal of Geophysical Research: Solid Earth. 122 (10): 8200–8213. Bibcode:2017JGRB..122.8200F. doi:10.1002/2017jb014592. hdl:10852/61236. ISSN 2169-9313.
  19. Mazzini, A., Svensen, H., Akhmanov, G.G., Aloisi, G., Planke, S., Malthe-Sorenssen, A., Istadi, B. (2007). "Triggering and dynamic evolution of the LUSI mud volcano, Indonesia". Earth and Planetary Science Letters. 261 (3–4): 375–388. Bibcode:2007E&PSL.261..375M. doi:10.1016/j.epsl.2007.07.001.CS1 maint: multiple names: authors list (link)
  20. Mazzini, A., Nermoen, A., Krotkiewski, M., Podladchikov, Y., Planke, S., Svensen, H. (2009). "Strike-slip faulting as a trigger mechanism for overpressure release through piercement structures. Implications for the LUSI mud volcano, Indonesia". Marine and Petroleum Geology. 26 (8–9): 1751–1765. doi:10.1016/j.marpetgeo.2009.03.001.CS1 maint: multiple names: authors list (link)
  21. Davies, R.J., Brumm, M., Manga, M., Rubiandini, R., Swarbrick, R., Tingay, M. (2008). "The East Java mud volcano (2006 to present): an earthquake or drilling trigger?". Earth and Planetary Science Letters. 272 (3–4): 627–638. Bibcode:2008E&PSL.272..627D. doi:10.1016/j.epsl.2008.05.029.CS1 maint: multiple names: authors list (link)
  22. Sawolo, N., Sutriono, E., Istadi, B., Darmoyo, A.B. (2009). "The LUSI mud volcano triggering controversy: was it caused by drilling?". Marine and Petroleum Geology. 26 (9): 1766–1784. doi:10.1016/j.marpetgeo.2009.04.002.CS1 maint: multiple names: authors list (link)
  23. Sawolo, N., Sutriono, E., Istadi, B., Darmoyo, A.B. (2010). "Was LUSI caused by drilling? – Authors reply to discussion". Marine and Petroleum Geology. 27 (7): 1658–1675. doi:10.1016/j.marpetgeo.2010.01.018.CS1 maint: multiple names: authors list (link)
  24. Istadi, B., Pramono, G.H., Sumintadireja, P., Alam, S. (2009). "Simulation on growth and potential Geohazard of East Java Mud Volcano, Indonesia". Marine and Petroleum Geology. 26 (9): 1724–1739. doi:10.1016/j.marpetgeo.2009.03.006.CS1 maint: multiple names: authors list (link)
  25. Dennis Normile (24 February 2011). "Indonesia's Infamous Mud Volcano Could Outlive All of Us". Science (AAAS). Archived from the original on 2 March 2011. Retrieved 15 April 2011.
  26. "Mud Volcanoes of Balochistan". 2007-03-02. Archived from the original on 2012-09-15. Retrieved 2009-08-13.
  27. "MUD VOLCANOES OF AZERBAIJAN". www.atlasobscura.com. Retrieved 29 August 2014.
  28. "Azeri mud volcano flares". BBC News. October 29, 2001. Retrieved May 13, 2010.
  29. S. Planke; H. Svensen; M. Hovland; D. A. Banks; B. Jamtveit (December 2003). "Mud and fluid migration in active mud volcanoes in Azerbaijan". Geo-Marine Letters. 23 (3–4): 258–268. Bibcode:2003GML....23..258P. doi:10.1007/s00367-003-0152-z.
  30. ""Lok-Batan" Mud Cone". whc.unesco.org. Retrieved 29 August 2014.
  31. "50 natural wonders: The ultimate list". CNN Travel. 2017-07-12. Retrieved 2017-07-23.
  32. "Geo-physical Features of Philippine Turtle Island". Ocean Ambassadors Track a Turtle. Retrieved on 2010-10-05.
  33. "Lihiman Island". Ocean Ambassadors Track a Turtle. Retrieved on 2010-10-05.
  34. Zulazhar Sheblee (11 October 2017). "'Volcanoes' pull in the crowd". The Star. Retrieved 23 January 2019.
  35. Sammlungen des Geologischen Reichsmuseums in Leiden, Arthur Wichmann: Gesteine von Timor und einiger angrenzenden Inseln. Leiden, E. J. Brill, 1882–1887 1, Bände 10–11, S. 165
  36. "Discover northern california". Independent Travel Tours. Archived from the original on 10 October 2008. Retrieved 25 February 2010.
  37. Howser, Huell (September 7, 2009). "Desert Adventures – California's Gold Special (142)". California's Gold. Chapman University Huell Howser Archive. Archived from the original on June 24, 2013.
  38. A Gurgling Mud Pool Is Creeping Across Southern California Like a Geologic Poltergeist Nov 2018
  39. NPS, Peaco, 1998
  40. "Mud volcano". USGS Photo glossary of volcano terms. Archived from the original on April 4, 2005. Retrieved April 20, 2005.
  41. Whittlesey, Lee (1995) [1995]. Death in Yellowstone: Accidents and Foolhardiness in the First National Park. Lanham, Maryland: Roberts Rinehart Publishers. ISBN 978-1-57098-021-3.
  42. Barnard, A.; Sager, W. W.; Snow, J. E.; Max, M. D. (2015-06-01). "Subsea gas emissions from the Barbados Accretionary Complex". Marine and Petroleum Geology. 64: 31–42. doi:10.1016/j.marpetgeo.2015.02.008.
  43. "Archived copy". Archived from the original on 2007-10-07. Retrieved 2007-02-23.CS1 maint: archived copy as title (link)
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