Mud volcano in Htee Pwint Kan Umbrella Pond (
Hydrate-bearing sediments, which often are associated with mud volcano activity. Source:
A mud volcano or mud dome is a
landform created by the eruption of
slurries, water and gases. Several geological processes may cause the formation of mud volcanoes. Mud volcanoes are not true
igneousvolcanoes as they do not produce
lava and are not necessarily driven by
magmatic activity. 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. Smaller mud exudations are sometimes referred to as mud-pots.
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".
A mud volcano may be the result of a
piercement structure created by a pressurized
muddiapir 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
hydrocarbonclathrate 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
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
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
On top of Gekpatlawuk mud volcano, Western Turkmenistan
Most liquid and solid material is released during eruptions, but seeps occur during dormant periods.
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."
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.
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.
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. That converts to 141–88,000 Tg/yr from all mud volcanoes, of which 0.033–235 Tg is from surface volcanoes.
Many mud volcanoes exist on the shores of the
Black Sea and
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.
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
Azerbaijan and its
Caspian coastline are home to nearly
400 mud volcanoes, more than half the total throughout the continents. Most mud volcanoes in Azerbaijan are active; some are protected by the Azerbaijan Ministry of Ecology and Natural Resources, and the admission of people, for security reasons, is prohibited. In 2001, one mud volcano 15 kilometres (9 mi) from
Baku made world headlines when it started ejecting flames 15 metres (49 ft) high.
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).
On 4 July 2021, a mud volcano eruption on
Dashli Island in the Caspian Sea, near an oil platform off the coast of Azerbaijan, caused a massive explosion and fireball, which was seen across the region, including from the capital
Baku, which is 74 kilometres (46 mi) to the north. The flames towered 500 metres (1,640 ft) into the air. There were no reports of injuries or damage to any oil platforms. The last previous volcanic eruption on the island was recorded in 1945 and the preceding one in 1920.
Mud volcanism is a common phenomenon in
Indonesia with dozens of structures present onshore and offshore.
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[clarification needed] hydrothermal system connected at depth with the neighboring
Arjuno-Welirang volcanic complex.
Drilling or an
earthquake in the
Porong subdistrict of
East Java province,
Indonesia, may have resulted in the
Sidoarjo mud flow on 29 May 2006. 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 magnitudeYogyakarta earthquake of 27 May 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 geoscientists led by Bambang Istadi predicted the area affected by the mudflow over a ten-year period. More recent studies carried out in 2011 predict that the mud will flow for another 20 years, or even longer. Now named
Lusi – a contraction of Lumpur
Sidoarjo, where lumpur is the Indonesian word for "mud" – the eruption represent an active hybrid system.
Suwoh depression in Lampung, dozens of mud cones and mud pots varying in temperature are found.
Grobogan, Bledug Kuwu mud volcano erupts at regular intervals, about every 2 or 3 minutes.
There are 10 active mud volcanoes in the
Izu–Bonin–Mariana Arc which can be found along a north to south trend, parallel to the Mariana trench. The material erupted at these mud volcanoes consists primarily of blue and green
serpentinite mud which contains fresh and serpentinized
peridotite material from the subduction channel. Fluid from the descending
Pacific Plate is released by dehydration and alteration of rocks and sediment. This fluid interacts with
ultramafic rocks in the descending Pacific Plate and overriding
Philippine Plate, resulting in the formation of serpentinite mud. All of these mud volcanoes are associated with faults, indicating that the faults act as conduits for the serpentine mud to migrate from the subduction channel to the surface. These mud volcanoes are large features on the forearc, the largest of which has a diameter of ~50 kilometres (31 mi) and is over 2 kilometres (1.2 mi) high.
Satellite image of mud volcanoes in Pakistan
Mount Mehdi Mud Volcano and its mud glacier in Balochistan province of Pakistan
Pakistan there are more than 130 active mud volcanoes or vents 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 300 to 2,600 feet (91.4 to 792.5 m). The most famous is
Chandragup. The biggest crater is of V15 mud volcano 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.
Mount Mehdi Mud Volcano near Miani Hor is also famous for large mud glacier around its caldera. Dormant mud volcanoes stand like columns of mud in many other areas.
Turtle Islands, in the
Tawi-Tawi, the southwestern edge of the
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. 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.
Other Asian locations
Mud volcano landscape at Oesilo, Oecusse District, East Timor
There are two active mud volcanoes in southern 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 kilometres (22 mi) from
Sarawak, Malaysia is a tourist attraction.
A drilling accident offshore of
Borneo in 1979 caused a mud volcano which took 20
relief wells and nearly 30 years to halt.
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
The name of
Yellowstone National Park's "Mud Volcano" feature and the surrounding area is misleading; it consists of
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
However, there are mud volcanoes and mud geysers elsewhere in Yellowstone. One, the "Vertically Gifted Cyclic Mud Pot" sometimes acts as a geyser, throwing mud up to 30 feet high.
The mud volcano feature in Yellowstone was previously a mound until a thermal explosion in the 1800s ripped it apart.[page needed]
One of the Devil's Woodyard Volcano (Trinidad & Tobago)
There are many mud volcanoes in
Trinidad and Tobago in the
oil reserves in southern parts of the island of
Trinidad. As of 15 August 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:
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
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.
El Totumo, which marks the division between
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.
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