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73-666: The Monti Cimini , in English: Cimini Hills , are a range of densely wooded volcanic hills approximately 56 km (35 mi) north-west of Rome . They are part of the Antiapennine range, facing the Apennines main range towards the Tyrrhenian Sea . They are situated in the centre of Tuscia Viterbese , the highest point at Mount Cimino , 1,053 m (3,455 ft) above sea level . Lake Vico ,

146-468: A ghost town ) and Fourpeaked Mountain in Alaska, which, before its September 2006 eruption, had not erupted since before 8000 BCE. Aeolian Islands There are seven significant islands: Lipari , Vulcano , Salina , Stromboli , Filicudi , Alicudi and Panarea , and a set of minor islands and rocks. The Aeolian Islands are 30 to 80 kilometres (19 to 50 mi) off the north coast of Sicily in

219-886: A mid-ocean ridge , such as the Mid-Atlantic Ridge , has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift , the Wells Gray-Clearwater volcanic field , and the Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from

292-428: A volcanic crater lake , is situated in the hills. The vegetation is predominantly beech forestation. The area is renowned for its hot springs , renaissance villas and Etruscan ruins. 42°21′30″N 12°10′40″E  /  42.3582°N 12.1777°E  / 42.3582; 12.1777 This Lazio location article is a stub . You can help Misplaced Pages by expanding it . Volcanic A volcano

365-437: A graduated spectrum, with much overlap between categories, and does not always fit neatly into only one of these three separate categories. The USGS defines a volcano as "erupting" whenever the ejection of magma from any point on the volcano is visible, including visible magma still contained within the walls of the summit crater. While there is no international consensus among volcanologists on how to define an active volcano,

438-462: A huge outdoor terrace, usually shaded by grape and flowering vines. In Homer 's epic poem, the Odyssey , Aeolus , son of Hippotes , was the divine keeper of the winds and king of the mythical, floating island of Aeolia. He kept the violent winds locked safely away inside the interior of his isle, releasing them only at the command of greatest gods to wreak devastation upon the world. The hero of

511-443: A paper was published suggesting a new definition for the word 'volcano' that includes processes such as cryovolcanism . It suggested that a volcano be defined as 'an opening on a planet or moon's surface from which magma , as defined for that body, and/or magmatic gas is erupted.' This article mainly covers volcanoes on Earth. See § Volcanoes on other celestial bodies and cryovolcano for more information. The word volcano

584-740: A rumour appeared in international newspapers that the Aeolian Islands had been "swallowed up by the sea" during a time of volcanic activity. While communication with the islands was interrupted for a time, they were not otherwise inconvenienced. During World War II , all of the Aeolian Islands were captured by the Allies in August 1943, during the invasion of Sicily . The islands were then extensively searched by archeologists Madeleine Cavalier and Luigi Bernabò Brea after World War II . The Aeolian Islands were listed by UNESCO in 2000 as

657-632: A volcano is largely determined by the composition of the lava it erupts. The viscosity (how fluid the lava is) and the amount of dissolved gas are the most important characteristics of magma, and both are largely determined by the amount of silica in the magma. Magma rich in silica is much more viscous than silica-poor magma, and silica-rich magma also tends to contain more dissolved gases. Lava can be broadly classified into four different compositions: Mafic lava flows show two varieties of surface texture: ʻAʻa (pronounced [ˈʔaʔa] ) and pāhoehoe ( [paːˈho.eˈho.e] ), both Hawaiian words. ʻAʻa

730-555: A volcano is of a conical mountain, spewing lava and poisonous gases from a crater at its summit; however, this describes just one of the many types of volcano. The features of volcanoes are varied. The structure and behaviour of volcanoes depend on several factors. Some volcanoes have rugged peaks formed by lava domes rather than a summit crater while others have landscape features such as massive plateaus . Vents that issue volcanic material (including lava and ash ) and gases (mainly steam and magmatic gases) can develop anywhere on

803-465: A volcano that has experienced one or more eruptions that produced over 1,000 cubic kilometres (240 cu mi) of volcanic deposits in a single explosive event. Such eruptions occur when a very large magma chamber full of gas-rich, silicic magma is emptied in a catastrophic caldera -forming eruption. Ash flow tuffs emplaced by such eruptions are the only volcanic product with volumes rivalling those of flood basalts . Supervolcano eruptions, while

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876-427: Is Lipari (37.5 km  [14.5 sq mi]), followed by Salina (26.8 km  [10.3 sq mi]), Vulcano (21.2 km  [8.2 sq mi]), Stromboli (12.6 km  [4.9 sq mi]), Filicudi (9.5 km  [3.7 sq mi]) and Alicudi (5.2 km  [2.0 sq mi]). The smallest island, at 3.4 km (1.3 sq mi), is Panarea. The highest elevation of

949-739: Is a volcanic field of over 60 cinder cones. Based on satellite images, it has been suggested that cinder cones might occur on other terrestrial bodies in the Solar system too; on the surface of Mars and the Moon. Stratovolcanoes (composite volcanoes) are tall conical mountains composed of lava flows and tephra in alternate layers, the strata that gives rise to the name. They are also known as composite volcanoes because they are created from multiple structures during different kinds of eruptions. Classic examples include Mount Fuji in Japan, Mayon Volcano in

1022-445: Is a rupture in the crust of a planetary-mass object , such as Earth , that allows hot lava , volcanic ash , and gases to escape from a magma chamber below the surface. The process that forms volcanoes is called volcanism . On Earth, volcanoes are most often found where tectonic plates are diverging or converging , and because most of Earth's plate boundaries are underwater, most volcanoes are found underwater. For example,

1095-412: Is characterized by a rough, clinkery surface and is the typical texture of cooler basalt lava flows. Pāhoehoe is characterized by its smooth and often ropey or wrinkly surface and is generally formed from more fluid lava flows. Pāhoehoe flows are sometimes observed to transition to ʻaʻa flows as they move away from the vent, but never the reverse. More silicic lava flows take the form of block lava, where

1168-565: Is derived from the name of Vulcano , a volcanic island in the Aeolian Islands of Italy whose name in turn comes from Vulcan , the god of fire in Roman mythology . The study of volcanoes is called volcanology , sometimes spelled vulcanology . According to the theory of plate tectonics, Earth's lithosphere , its rigid outer shell, is broken into sixteen larger and several smaller plates. These are in slow motion, due to convection in

1241-584: Is expressed using the volcanic explosivity index (VEI), which ranges from 0 for Hawaiian-type eruptions to 8 for supervolcanic eruptions. As of December 2022 , the Smithsonian Institution 's Global Volcanism Program database of volcanic eruptions in the Holocene Epoch (the last 11,700 years) lists 9,901 confirmed eruptions from 859 volcanoes. The database also lists 1,113 uncertain eruptions and 168 discredited eruptions for

1314-537: Is one of the several tuyas in the area of the Tuya River and Tuya Range in northern British Columbia. Tuya Butte was the first such landform analysed and so its name has entered the geological literature for this kind of volcanic formation. The Tuya Mountains Provincial Park was recently established to protect this unusual landscape, which lies north of Tuya Lake and south of the Jennings River near

1387-535: Is said around 9,000 of the 10,000 citizens of Lipari were captured and enslaved although a couple of more recent scholars have questioned this number arguing for a lower population at the time of Barbarossa. A number of citizens were ransomed in Messina and returned to the islands but most of those captured never returned. Only after the tragedy did the Spanish authorities turn their attention to Lipari and repopulate

1460-471: Is typically low in silica, shield volcanoes are more common in oceanic than continental settings. The Hawaiian volcanic chain is a series of shield cones, and they are common in Iceland , as well. Lava domes are built by slow eruptions of highly viscous lava. They are sometimes formed within the crater of a previous volcanic eruption, as in the case of Mount St. Helens , but can also form independently, as in

1533-603: The Byzantine Empire . According to a Christian legend, in 264 a coffin which contained the body of Bartholomew washed up on the beach of Lipari, with the result that Bartholomew was immediately elected the patron saint of the Aeolian Islands. In 836 the Aghlabids of Ziyadat Allah I of Ifriqiya sacked Lipari, massacred most of the population, enslaved the survivors and annexed the Liparian Islands into

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1606-930: The Carthaginians against Rome during the Punic Wars . Although the Battle of the Lipari Islands in 260 BC led to a Carthaginian victory, the Romans later sacked Lipari and their domination led to a period of poverty. At the fall of the Western Roman Empire , the Aeolian Islands came under the sway of the Visigoths , the Vandals and the Ostrogoths , followed by the domination of

1679-617: The Cascade Volcanoes or the Japanese Archipelago , or the eastern islands of Indonesia . Hotspots are volcanic areas thought to be formed by mantle plumes , which are hypothesized to be columns of hot material rising from the core-mantle boundary. As with mid-ocean ridges, the rising mantle rock experiences decompression melting which generates large volumes of magma. Because tectonic plates move across mantle plumes, each volcano becomes inactive as it drifts off

1752-641: The Emirate of Sicily . The Norman conquest of Sicily from the Emirate of Sicily in 1061 resulted in the annexation of the islands. Roger II of Sicily sent the Benedictine monks to Lipari , which gave rise to considerable development on the islands. A cathedral dedicated to Saint Bartholomew was built, as well as the Benedictine monastery in the castle. In 1208 Frederick II of Swabia acceded to

1825-804: The core–mantle boundary , 3,000 kilometres (1,900 mi) deep within Earth. This results in hotspot volcanism , of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide past one another. Large eruptions can affect atmospheric temperature as ash and droplets of sulfuric acid obscure the Sun and cool Earth's troposphere . Historically, large volcanic eruptions have been followed by volcanic winters which have caused catastrophic famines. Other planets besides Earth have volcanoes. For example, volcanoes are very numerous on Venus. Mars has significant volcanoes. In 2009,

1898-834: The landform and may give rise to smaller cones such as Puʻu ʻŌʻō on a flank of Kīlauea in Hawaii. Volcanic craters are not always at the top of a mountain or hill and may be filled with lakes such as with Lake Taupō in New Zealand. Some volcanoes can be low-relief landform features, with the potential to be hard to recognize as such and be obscured by geological processes. Other types of volcano include cryovolcanoes (or ice volcanoes), particularly on some moons of Jupiter , Saturn , and Neptune ; and mud volcanoes , which are structures often not associated with known magmatic activity. Active mud volcanoes tend to involve temperatures much lower than those of igneous volcanoes except when

1971-583: The Aeolian Islands were occupied by the Ausones led by Liparus . Liparus was succeeded by Aeolus whose house, according to the Odyssey by Homer , gave hospitality to Odysseus . In 580 BC, Greeks exiled from Rhodes and Knidos landed at Lipari and began a period of Greek domination , which was known for acts of piracy against Etruscan and Phoenician shipping. There was production of vases and other ceramics . The islanders were allies of

2044-421: The Aeolian Islands were visited by Archduke Ludwig Salvator of Austria —a friend of the islands and also a man with a profound knowledge of the archipelago. Between the years 1893–96 he published a work of eight volumes on the Aeolian Islands. In August 1888, the crater named Fossa on Vulcano erupted and caused many deaths in the sulphur mines . The eruptions continued for 19 months. On New Year's Day in 1909,

2117-443: The Aeolian Islands, together with Ustica and a series of submarine volcanoes named Magnani, Vavilov, Marsili and Palinuro , as well as two that are unnamed. The present shape of the Aeolian Islands is the result of volcanic activity over a period of 260,000 years. There are two active volcanoes – Stromboli and Vulcano . Steaming fumaroles and thermal waters are on most of the islands. The volcanic activity has also left

2190-663: The French fleet without resistance, and in return obtained various commercial and fiscal benefits. In the mid-15th century, Naples and Palermo united into the Kingdom of the Two Sicilies under the crown of Alfonso V of Aragon . On June 30, 1544, a fleet of 180 Ottoman vessels under the command of the corsair Hayreddin Barbarossa occupied Lipari and laid siege to the castle. The defenders surrendered. Historically, it

2263-477: The Lipari Islands is Monte Fossa delle Felci  [ it ] on Salina, which reaches a height of 962 m (3,156 ft). The seven Aeolian Islands, covering an area of 1,600 km (620 sq mi), originated in the Tyrrhenian Basin , a great plain at the bottom of the Tyrrhenian Sea . Emissions of lava from depths of up to 3,600 m (11,800 ft) resulted in the formation of

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2336-622: The Philippines, and Mount Vesuvius and Stromboli in Italy. Ash produced by the explosive eruption of stratovolcanoes has historically posed the greatest volcanic hazard to civilizations. The lavas of stratovolcanoes are higher in silica, and therefore much more viscous, than lavas from shield volcanoes. High-silica lavas also tend to contain more dissolved gas. The combination is deadly, promoting explosive eruptions that produce great quantities of ash, as well as pyroclastic surges like

2409-555: The Tyrrhenian Sea. Vulcano is located closest to the Sicilian coast. Lipari and Salina follow to the north, Filicudi and Alicudi to the west, and Panarea and Stromboli to the northeast. In addition to these seven inhabited islands, there are a number of smaller, uninhabited islands and rocky cliffs, such as Basiluzzo , Strombolicchio , Dattilo  [ it ] and Lisca Bianca  [ it ] . The largest island

2482-613: The USGS defines a volcano as active whenever subterranean indicators, such as earthquake swarms , ground inflation, or unusually high levels of carbon dioxide or sulfur dioxide are present. The USGS defines a dormant volcano as any volcano that is not showing any signs of unrest such as earthquake swarms, ground swelling, or excessive noxious gas emissions, but which shows signs that it could yet become active again. Many dormant volcanoes have not erupted for thousands of years, but have still shown signs that they may be likely to erupt again in

2555-510: The boundary with the Yukon Territory . Mud volcanoes (mud domes) are formations created by geo-excreted liquids and gases, although several processes may cause such activity. The largest structures are 10 kilometres in diameter and reach 700 meters high. The material that is expelled in a volcanic eruption can be classified into three types: The concentrations of different volcanic gases can vary considerably from one volcano to

2628-402: The case of Lassen Peak . Like stratovolcanoes, they can produce violent, explosive eruptions, but the lava generally does not flow far from the originating vent. Cryptodomes are formed when viscous lava is forced upward causing the surface to bulge. The 1980 eruption of Mount St. Helens was an example; lava beneath the surface of the mountain created an upward bulge, which later collapsed down

2701-474: The city with Sicilian, Calabrian and Spanish families. The city walls and houses were rebuilt and an Aeolian fleet was constructed which was able to successfully defend the Tyrrhenian Sea from the Ottomans. In 1693, an earthquake destroyed all the towns in eastern Sicily, causing around 60,000 deaths. After the population invoked the protection of Saint Bartholomew during prayers in the cathedral , there

2774-799: The enormous area they cover, and subsequent concealment under vegetation and glacial deposits, supervolcanoes can be difficult to identify in the geologic record without careful geologic mapping . Known examples include Yellowstone Caldera in Yellowstone National Park and Valles Caldera in New Mexico (both western United States); Lake Taupō in New Zealand; Lake Toba in Sumatra , Indonesia; and Ngorongoro Crater in Tanzania. Volcanoes that, though large, are not large enough to be called supervolcanoes, may also form calderas in

2847-534: The epic poem, Odysseus , on his travels to return home from Troy , visited Aiolos' isle and was entrusted with a bag containing all of the winds to ensure a safe voyage home. However, during the trip, the hero's companions opened the bag and the escaping winds carried their ship all the way back to Aiolos' shore. The first evidence of Sicilian migration was in Lipari ( Castellaro Vecchio culture  [ it ] ). The manufacture and commerce of obsidian objects

2920-431: The flow is covered with angular, vesicle-poor blocks. Rhyolitic flows typically consist largely of obsidian . Tephra is made when magma inside the volcano is blown apart by the rapid expansion of hot volcanic gases. Magma commonly explodes as the gas dissolved in it comes out of solution as the pressure decreases when it flows to the surface . These violent explosions produce particles of material that can then fly from

2993-610: The formation of a submarine volcano off the coast of Mayotte . Subglacial volcanoes develop underneath ice caps . They are made up of lava plateaus capping extensive pillow lavas and palagonite . These volcanoes are also called table mountains, tuyas , or (in Iceland) mobergs. Very good examples of this type of volcano can be seen in Iceland and in British Columbia . The origin of the term comes from Tuya Butte , which

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3066-585: The future. In an article justifying the re-classification of Alaska's Mount Edgecumbe volcano from "dormant" to "active", volcanologists at the Alaska Volcano Observatory pointed out that the term "dormant" in reference to volcanoes has been deprecated over the past few decades and that "[t]he term "dormant volcano" is so little used and undefined in modern volcanology that the Encyclopedia of Volcanoes (2000) does not contain it in

3139-466: The glossaries or index", however the USGS still widely employs the term. Previously a volcano was often considered to be extinct if there were no written records of its activity. Such a generalization is inconsistent with observation and deeper study, as has occurred recently with the unexpected eruption of the Chaitén volcano in 2008. Modern volcanic activity monitoring techniques, and improvements in

3212-492: The interior of a continent and lead to rifting. Early stages of rifting are characterized by flood basalts and may progress to the point where a tectonic plate is completely split. A divergent plate boundary then develops between the two halves of the split plate. However, rifting often fails to completely split the continental lithosphere (such as in an aulacogen ), and failed rifts are characterized by volcanoes that erupt unusual alkali lava or carbonatites . Examples include

3285-619: The islands except Salina comprise the commune of Lipari within that province; Salina forms three separate communes: Malfa , Leni and Santa Marina Salina . Curbing urban development has been a key in preserving the Aeolian islands in a natural state. New buildings are severely restricted. Existing residences can be bought and restored but they must be constructed to resemble its whitewashed houses. Traditional houses consist of modular cubes constructed from indigenous building materials like stone, lava, pumice, and tufo. Almost all houses have

3358-530: The islands with a very fertile soil that is beneficial in the growth of natural flora . Geologically the archipelago is defined as a volcanic arc . The origin of the Aeolian Islands is due to movement of the Earth's crust as a result of plate tectonics . The African continental shelf is in constant movement towards Europe . Its subduction underneath the Eurasian plate generates magma , which rises to

3431-419: The mid-oceanic ridge is above sea level, volcanic islands are formed, such as Iceland . Subduction zones are places where two plates, usually an oceanic plate and a continental plate, collide. The oceanic plate subducts (dives beneath the continental plate), forming a deep ocean trench just offshore. In a process called flux melting , water released from the subducting plate lowers the melting temperature of

3504-551: The modelling of the factors that produce eruptions, have helped the understanding of why volcanoes may remain dormant for a long time, and then become unexpectedly active again. The potential for eruptions, and their style, depend mainly upon the state of the magma storage system under the volcano, the eruption trigger mechanism and its timescale. For example, the Yellowstone volcano has a repose/recharge period of around 700,000 years, and Toba of around 380,000 years. Vesuvius

3577-415: The most dangerous type, are very rare; four are known from the last million years , and about 60 historical VEI 8 eruptions have been identified in the geologic record over millions of years. A supervolcano can produce devastation on a continental scale, and severely cool global temperatures for many years after the eruption due to the huge volumes of sulfur and ash released into the atmosphere. Because of

3650-438: The mud volcano is actually a vent of an igneous volcano. Volcanic fissure vents are flat, linear fractures through which lava emerges. Shield volcanoes, so named for their broad, shield-like profiles, are formed by the eruption of low-viscosity lava that can flow a great distance from a vent. They generally do not explode catastrophically but are characterized by relatively gentle effusive eruptions . Since low-viscosity magma

3723-452: The next. Water vapour is typically the most abundant volcanic gas, followed by carbon dioxide and sulfur dioxide . Other principal volcanic gases include hydrogen sulfide , hydrogen chloride , and hydrogen fluoride . A large number of minor and trace gases are also found in volcanic emissions, for example hydrogen , carbon monoxide , halocarbons , organic compounds, and volatile metal chlorides. The form and style of an eruption of

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3796-876: The north side of the mountain. Cinder cones result from eruptions of mostly small pieces of scoria and pyroclastics (both resemble cinders, hence the name of this volcano type) that build up around the vent. These can be relatively short-lived eruptions that produce a cone-shaped hill perhaps 30 to 400 metres (100 to 1,300 ft) high. Most cinder cones erupt only once and some may be found in monogenetic volcanic fields that may include other features that form when magma comes into contact with water such as maar explosion craters and tuff rings . Cinder cones may form as flank vents on larger volcanoes, or occur on their own. Parícutin in Mexico and Sunset Crater in Arizona are examples of cinder cones. In New Mexico , Caja del Rio

3869-549: The ocean surface as new islands or floating pumice rafts . In May and June 2018, a multitude of seismic signals were detected by earthquake monitoring agencies all over the world. They took the form of unusual humming sounds, and some of the signals detected in November of that year had a duration of up to 20 minutes. An oceanographic research campaign in May 2019 showed that the previously mysterious humming noises were caused by

3942-420: The ocean surface, due to the rapid cooling effect and increased buoyancy in water (as compared to air), which often causes volcanic vents to form steep pillars on the ocean floor. Hydrothermal vents are common near these volcanoes, and some support peculiar ecosystems based on chemotrophs feeding on dissolved minerals. Over time, the formations created by submarine volcanoes may become so large that they break

4015-471: The ocean's surface. In the deep ocean basins, the tremendous weight of the water prevents the explosive release of steam and gases; however, submarine eruptions can be detected by hydrophones and by the discoloration of water because of volcanic gases . Pillow lava is a common eruptive product of submarine volcanoes and is characterized by thick sequences of discontinuous pillow-shaped masses which form underwater. Even large submarine eruptions may not disturb

4088-468: The one that destroyed the city of Saint-Pierre in Martinique in 1902. They are also steeper than shield volcanoes, with slopes of 30–35° compared to slopes of generally 5–10°, and their loose tephra are material for dangerous lahars . Large pieces of tephra are called volcanic bombs . Big bombs can measure more than 1.2 metres (4 ft) across and weigh several tons. A supervolcano is defined as

4161-425: The overlying mantle wedge, thus creating magma . This magma tends to be extremely viscous because of its high silica content, so it often does not reach the surface but cools and solidifies at depth . When it does reach the surface, however, a volcano is formed. Thus subduction zones are bordered by chains of volcanoes called volcanic arcs . Typical examples are the volcanoes in the Pacific Ring of Fire , such as

4234-619: The plume, and new volcanoes are created where the plate advances over the plume. The Hawaiian Islands are thought to have been formed in such a manner, as has the Snake River Plain , with the Yellowstone Caldera being part of the North American plate currently above the Yellowstone hotspot . However, the mantle plume hypothesis has been questioned. Sustained upwelling of hot mantle rock can develop under

4307-496: The remains of the ex-penitentiary in the castle. However, not long after, the castle was converted to accommodate anti-Fascist political prisoners in enforced exile. Liparians fraternised with these exiles until the Allies ' liberation. After the war, the same room that had housed the opponents of Fascism became the Aeolian Archaeological Museum  [ it ] . Towards the end of the 19th century,

4380-435: The same time interval. Volcanoes vary greatly in their level of activity, with individual volcanic systems having an eruption recurrence ranging from several times a year to once in tens of thousands of years. Volcanoes are informally described as erupting , active , dormant , or extinct , but the definitions of these terms are not entirely uniform among volcanologists. The level of activity of most volcanoes falls upon

4453-492: The same way; they are often described as "caldera volcanoes". Submarine volcanoes are common features of the ocean floor. Volcanic activity during the Holocene Epoch has been documented at only 119 submarine volcanoes, but there may be more than one million geologically young submarine volcanoes on the ocean floor. In shallow water, active volcanoes disclose their presence by blasting steam and rocky debris high above

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4526-622: The solidified erupted material that makes up the mantle of a volcano may be stripped away that its inner anatomy becomes apparent. Using the metaphor of biological anatomy , such a process is called "dissection". Cinder Hill , a feature of Mount Bird on Ross Island , Antarctica , is a prominent example of a dissected volcano. Volcanoes that were, on a geological timescale, recently active, such as for example Mount Kaimon in southern Kyūshū , Japan , tend to be undissected. Eruption styles are broadly divided into magmatic, phreatomagmatic, and phreatic eruptions. The intensity of explosive volcanism

4599-525: The surface to form the volcanoes . The "Aeolian Arc" extends for more than 140 km (87 mi). It is a section of a larger area of geological instability across the Mediterranean region, caused by the collision of Africa and Europe , which includes Sicily , Calabria , and Campania together with Greece and the Aegean islands . The islands form part of the Sicilian province of Messina . All

4672-406: The surrounding areas, and initially not seismically monitored before its unanticipated and catastrophic eruption of 1991. Two other examples of volcanoes that were once thought to be extinct, before springing back into eruptive activity were the long-dormant Soufrière Hills volcano on the island of Montserrat , thought to be extinct until activity resumed in 1995 (turning its capital Plymouth into

4745-434: The theory of plate tectonics. For example, some volcanoes are polygenetic with more than one period of activity during their history; other volcanoes that become extinct after erupting exactly once are monogenetic (meaning "one life") and such volcanoes are often grouped together in a geographical region. At the mid-ocean ridges , two tectonic plates diverge from one another as hot mantle rock creeps upwards beneath

4818-444: The thinned oceanic crust . The decrease of pressure in the rising mantle rock leads to adiabatic expansion and the partial melting of the rock, causing volcanism and creating new oceanic crust. Most divergent plate boundaries are at the bottom of the oceans, and so most volcanic activity on Earth is submarine, forming new seafloor . Black smokers (also known as deep sea vents) are evidence of this kind of volcanic activity. Where

4891-635: The throne of the Kingdom of Sicily . The period of prosperity which followed, ended with the domination of the Angevins and the rebellion of the Sicilians which culminated in the revolt of the Sicilian Vespers . The Aeolians however, remained loyal to Charles of Anjou , and commercial links were established with Naples , the capital of the Angevin kingdom. In 1337 Lipari opened its gates to

4964-431: The underlying ductile mantle , and most volcanic activity on Earth takes place along plate boundaries, where plates are converging (and lithosphere is being destroyed) or are diverging (and new lithosphere is being created). During the development of geological theory, certain concepts that allowed the grouping of volcanoes in time, place, structure and composition have developed that ultimately have had to be explained in

5037-492: The volcano. Solid particles smaller than 2 mm in diameter ( sand-sized or smaller) are called volcanic ash. Tephra and other volcaniclastics (shattered volcanic material) make up more of the volume of many volcanoes than do lava flows. Volcaniclastics may have contributed as much as a third of all sedimentation in the geologic record. The production of large volumes of tephra is characteristic of explosive volcanism. Through natural processes, mainly erosion , so much of

5110-424: The volcanoes of the East African Rift . A volcano needs a reservoir of molten magma (e.g. a magma chamber), a conduit to allow magma to rise through the crust, and a vent to allow the magma to escape above the surface as lava. The erupted volcanic material (lava and tephra) that is deposited around the vent is known as a volcanic edifice , typically a volcanic cone or mountain. The most common perception of

5183-421: Was described by Roman writers as having been covered with gardens and vineyards before its unexpected eruption of 79 CE , which destroyed the towns of Herculaneum and Pompeii . Accordingly, it can sometimes be difficult to distinguish between an extinct volcano and a dormant (inactive) one. Long volcano dormancy is known to decrease awareness. Pinatubo was an inconspicuous volcano, unknown to most people in

5256-690: Was highly developed until the introduction of metals . During the Bronze Age , the Aeolians prospered by means of maritime commerce in an area which extended from Mycenae to the British Isles , from where tin was imported. Villages on the Aeolian islands flourished on Capo Graziano (Filicudi), Castello (Lipari), Serro dei Cianfi (Salina), Capo Milazzese (Panarea), and Portella (Salina). All these settlements were destroyed by new Italic invasions in 1250 BC. According to Diodorus Siculus ,

5329-589: Was not a single victim on the Aeolian Islands. The economic conditions of the islands improved greatly during the 17th century with agricultural progress ( malvasia grapes), capers , and a variety of fruit, vegetables and fishing). With the Bourbons came the introduction of criminal and political prisoners to the islands. In 1916, the penal colony was closed, but the Fascist regime unsuccessfully tried to reopen it in 1926. The island population reacted by pulling down

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