Where are most Composite (Strata Cone) Volcanoes usually located?
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You can find the general or exact locations on this site:\n\nhttp://www.volcano.si.edu/world/\n\nIt takes just that little bit of work to find them... and if it doesn't work, type every keyword you know into Google.
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Subduction zone. Strato Volcano. Basaltic Oceanic Plate is subducting under a granitic Continental Plate.
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Below are the most active volcanoes in order of how long that have been active.\nEtna Italy 3500 years \nStromboli Italy 2000 years \nYasur Vanuatu 800 years \nAmbrym Vanuatu 1935- \nTinakula Solomon Islands 1951?- \nErta Ale Ethiopia 1967- \nManam Papua New Guinea 1974- \nLangila Papua New Guinea 1960- \nBagana Papua New Guinea 1972- \nSemeru Indonesia 1967- \nMerapi Indonesia 1967- \nDukono Indonesia 1933- \nSakura-jima Japan 1955- \nSuwanose-jima Japan 1949- \nSanta Maria Guatemala 1922- \nPacaya Guatemala 1965- \nArenal Costa Rica 1968- \nSangay Ecuador 1934- \nErebus Antarctica 1972- \nPiton de la Fournaise Reunion 1920- \nKilauea Hawaii 1983- \n\nThe following 4 volcanoes emit the most lava. \nKilauea (Hawaii) \nMt Etna (Italy) \nPiton de la Fournaise, (Réunion) \nNyamuragira, (D.R. Congo) \n\nThis website also looks to have a lot of information on the most active volcanoes in the world. It breaks them down by continent.\nhttp://www.volcanodiscovery.com/volcano-tours/558.html
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Those would be the Eurasian and Australian plates:\n\nhttp://www.cotf.edu/ete/modules/msese/earthsysflr/plates1.html\n\nTambora was affected by the subduction of the Australian plate under the Eurasian in the same way subduction affects most plate-boundary volcanoes; by the partial melting of the the descending plate, which created magma that ultimately fed the volcano.
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I think its called 'subduction', where one tectonic plate goes under another. It occurs at 'subduction zones', such as on the west coast of the United States. The reason it occurs is that one plate is expanding and the edges need to go somewhere (under another plate). For example, the Atlantic plate is expanding from the center because there is a north-to-south line of underwater volcanoes, spewing out magma and forcing the 2 halves of the plate apart to the west and east.
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The most common place to find shield volcanoes is over hotspots (such as Hawai'i, the Galapagos, etc.). This is because hotspot magmas are almost always hot basalts and therefore the erupted lavas have low viscosities. Low viscosity lavas cannot be piled up very steeply so they form shield volcanoes.\nSubduction-zone magmas are almost always cooler and they are higher in silica, both qualities that make the lavas more viscous. These magmas are able to pile up into steep domes and additionally make the volcanoes more explosive so that they have a greater percentage of ash. This makes the volcanoes steep strato-cones instead of shields. It isn't impossible to find shield volcanoes along lines of arc volcanoes (for example Masaya in Nicaragua), but it is rare.
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Mount Saint Helens is an active composite cone
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Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes. \n\nIn regard to your question, Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most cinder cones have a bowl-shaped crater at the summit and rarely rise more than a thousand feet or so above their surroundings. Cinder cones are numerous in western North America as well as throughout other volcanic terrains of the world.\n\nShield volcanoes are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior's shield. They are built up slowly by the accretion of thousands of highly fluid lava flows called basalt lava that spread widely over great distances, and then cool as thin, gently dipping sheets. Lavas also commonly erupt from vents along fractures (rift zones) that develop on the flanks of the cone. Some of the largest volcanoes in the world are shield volcanoes. In northern California and Oregon, many shield volcanoes have diameters of 3 or 4 miles and heights of 1,500 to 2,000 feet. The Hawaiian Islands are composed of linear chains of these volcanoes including Kilauea and Mauna Loa on the island of Hawaii-- two of the world's most active volcanoes. The floor of the ocean is more than 15,000 feet deep at the bases of the islands. As Mauna Loa, the largest of the shield volcanoes (and also the world's largest active volcano), projects 13,677 feet above sea level, its top is over 28,000 feet above the deep ocean floor.
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A subglacial volcano is a volcanic form produced by eruptions beneath a glacier or beneath the surface of a lake within a glacier. Today they are most common in Iceland and Antarctica; older formations of this type are found also in parts of Canada. Their shape tends to be characteristic and unusual, with flat top and steep sides. If the heat produced by the volcano is high enough to melt through the ice layer, however, the volcano assumes a more conventional shape.
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Japan. Here are links to more info on Mount Fuji:\n\nhttp://en.wikipedia.org/wiki/Mount_Fuji\nhttp://www.japan-guide.com/e/e2172.html\nhttp://volcano.und.nodak.edu/vwdocs/volc_images/img_fuji.html\nhttp://www.mt-fuji.co.jp/index-e.html
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A.Types of Islands: High Islands\nHigh islands are further classified as either continental or oceanic. The continental high islands were once part of the eastern edge of the Australian and Asian continents and are composed of substances similar to their former continents: ancient metamorphic rocks and sediments as well as rocks such as schist, gneiss, clay, and sandstone. Continental islands include New Guinea and most islands of Melanesia, which together account for more than three-fourths of Oceania’s land area.\n\nThe oceanic high islands, sometimes called volcanic islands, are divided from the continental high islands by a north-south boundary of rock formations beneath the sea called the Andesite line. The oceanic islands are composed of volcanic materials that were forced upward through cracks, or fissures, in the ocean floor and from newly deposited sediments. The islands, then, are merely the tops of undersea mountains. Typically, the mountains (and thus the islands) extend in curving chains. These high oceanic islands are common in Polynesia and Micronesia. The island of Hawaii, in Polynesia, contains the peaks Mauna Loa and Mauna Kea, which are considered the world’s largest mountains in terms of mass and height above the ocean floor. Although both peaks rise less than 4300 m (14,000 ft) above sea level, they rise about 10,000 m (33,000 ft) from the sea floor. Other examples of high oceanic islands in Polynesia include the Samoas, Tahiti and the Marquesas, and Rarotonga in the Cook Islands. In Micronesia, Kosrae and Pohnpei of the Caroline Islands are examples.
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Hawaii and Iceland are examples of places where volcanoes extrude huge quantities of basaltic lava that gradually build a wide mountain with a cone-like profile. Olympus Mons is the largest cone volcano on Mars, and is the tallest known mountain in the solar system. Smaller versions of cone volcanoes include lava cones, and lava mounds.\n\nQuiet eruptions spread out basaltic lava in flat layers. The buildup of these layers form a broad volcano with gently sloping sides called a shield volcano or a cone Examples of shield volcanoes are the Hawaiian Islands.
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The "Ring of Fire" is an arc stretching from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the coast of North and South America. It is composed over 75% of the world's active and dormant volcanoes.
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It's a pretty impressive stratovolcano also called Fuji-san. It towers almost 11,500 feet above the surrounding area. The most recent eruption was in 1707 on the southeast side of the cone. That eruption blew out about 0.8 cubic kilometers of volcanic ash. By comparison Mt.St.Helens in 1980 ejected 1.25 cubic km of ash. There have been 16 eruptions recorded since 781 AD. \n\nIt appears from looking at the Global Volcanism Program that there has been no earthquake activity in the volcano since 2001. It seems quiet, but is a young volcano still. \n\nHere is a great collection of Mt Fuji photos:\nhttp://live-fuji.jp/fuji/beste.htm\nHere is a live web cam link of Mt Fuji:\nhttp://live-fuji.jp/fuji/livee.htm
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Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most cinder cones have a bowl-shaped crater at the summit and rarely rise more than a thousand feet or so above their surroundings. Cinder cones are numerous in western North America as well as throughout other volcanic terrains of the world.
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Volcanoes are a result of the Earth trying to lose its internal heat. If the Earth's interior was cold, there would be no volcanoes. So how does a volcano form hey.\n\nWell, deep inside Earth, between the molten iron core and the thin crust at the surface, there is the mantle, a large layer of rock that is largely solid, but flows like plastic. When, for various reasons, rock from the mantle melts, it sometimes moves to the Earth’s surface through weak spots in the crust, releasing heat, gasses, and rock, what do you get when you put all this together..... you got it,  a volcanic eruption.\n\nVolcanoes erupt because magma is less dense than the solid rocks surrounding it in the mantle of the earth. As it nears the surface, gases expand and boil out of the rock, and this force of explosion propels lava from the vent. \n\nVolcanoes can occur by themselves or in belts and chains. The location of these volcanoes splits them into three groups. Rift volcanoes, subduction volcanoes, and hot spot volcanoes. This has a lot to do with plate tectonics, or moving of the segments of the earth's lithosphere. \n\n· Rift volcanoes occur where the plates are moving away from each other. They fill the separations with lava flows, creating new sea floor and mountain ridges beneath the waves. \n\n· Subduction volcanoes form where the plates collide and slide over each other. They create ridges and peaks. The Ring of Fire is a famous chain of volcanoes that rim the Pacific Ocean. About 1,000 live subduction volcanoes occur in this ring, and in any one-year, approximately 40 will be in some state of eruption. The Ring of Fire is composed of stratovolcanoes, which normally occur in chains, and account for over 95% of the world's active volcanoes.\n\nHot spot volcanoes are the exception to the rule of volcanoes occurring along plate margins. There are constant zones of magma within the earth in some places beneath the plates. The magma pierces through the plate. As time passes and the plates move, new volcanoes appear, and the extinct volcanoes are carried away with the drift of the plates. The common forms of hot spot volcanoes are shield volcanoes, like Mauna Loa of the Hawaiian Islands.\n\nMany factors determine the location, appearance, and amount of activity of each volcano. The location and consistency of magma determine the type of explosion, which determine the type of volcano that is formed. \n\nVolcanoes are both facinating and deadly examples of natures power. They are natural wonders that should be not just appreciated, but studied aswell. \n\nSorry this is long its just I studied volcanoes at uni and just find them fascinating.
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Like most of the interior of the earth, the movements and dynamics of magma are poorly understood. However, it is known that an eruption usually follows movement of magma upwards into the solid layer (the earth's crust) beneath a volcano and occupying a magma chamber. Eventually, magma in the chamber is forced upwards and flows out across the planet surface as lava, or the rising magma can heat water in the surrounding landform and cause explosive discharges of steam; either this or escaping gases from the magma can produce forceful ejections of rocks, cinders, volcanic glass, and/or volcanic ash also known as tephra. While always displaying powerful forces, eruptions can vary from effusive to extremely explosive.\n\nMost volcanoes on the land are formed at destructive plate margins: where oceanic crust is forced below the continental crust because oceanic crust is denser than continental crust. As the oceanic crust 'subducts', it is forced into a higher-temperature region called the asthenosphere, and melts. Friction between these moving plates may also be a cause of melting. The reduced density of the melting rock forces the newly formed magma to rise. As the magma rises through weak areas in the continental crust it may eventually erupt as one or more volcanoes. For example, Mount St. Helens is found inland from the margin between the oceanic Juan de Fuca Plate and the continental North American Plate. The oceanic crust is normally a highly-'mafic' (iron and magnesium rich) rock, but as it rises through granitic (more silicic) continental plates, it may cause 'partial melting' of both mantle rocks and the plate rocks, producing magmas of varying silicity. Volcanic arcs forming near subduction zones, on the edges of continental plates, usually form high-silicity (high-viscosity) stratovolcanoes. Examples include the South American Andes and the Cascade range.\n \nA volcano generally presents itself to the imagination as a mountain sending forth from its summit great clouds of smoke with vast sheets of flame. The truth is that a volcano seldom emits either smoke or flame, although various combinations of hydrogen, carbon, oxygen, and sulfur do sometimes ignite. What is mistaken for smoke consists of vast volumes of fine dust (called volcanic ash), mingled with steam and other vapors, chiefly sulfurous. Most of what appears to be flames is the glare from the erupting materials, glowing because of their high temperature; this glare reflects off the clouds of dust and steam, resembling fire.\n\nPerhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular shape, formed by a vent (or vents) from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of vast depth. Very large features of this sort are termed calderas. Some volcanoes consist of a crater alone, with scarcely any mountain at all; but in the majority of cases the crater is situated on top of a mountain (the volcano), which can tower to an enormous height. Volcanoes that terminate in a principal crater are usually of a conical form.\n\nVolcanic cones are usually smaller features composed of loose ash and cinder, with occasional masses of stone which have been tossed violently into the air by the eruptive forces (and are thus called ejecta). Within the crater of a volcano there may be numerous cones from which vapours are continually issuing, with occasional volleys of ashes and stones. In some volcanoes these cones form lower down the mountain, along rift zones or fractures. When the cone is eroded these rifts or lava filled fractures remain as radial near vertical dikes of volcanic rock. For example the radiating dikes at Shiprock in NW New Mexico.