Volcanoes Volcanoes Aoba, also known as Ambae, is an island in the South Pacific island nation of Vanuatu, located near 15 30' S and 167 30' E. Ambae has a population of less than 10,000, divided into 3-4 discernable language groups (North/East Ambae language centered around the Lombaha area, West Ambae language centered around Nduindui, and South Ambae language centered around Redcliff). The island has no considerable towns, though the Penama provincial center is located at Saratamata on East Ambae, and there are three airstrips with service by Vanair, at Walaha(W), Redcliff(S), and Longana(E). ...more on Wikipedia about "Aoba Island"
The Auckland volcanic field is a monogenetic volcanic field on the North Island of New Zealand. Basaltic in nature, it underlies much of the metropolitan area of Auckland. ...more on Wikipedia about "Auckland Volcanic Field"
Baratang (coordinates: ) is an island in the Andaman Islands, India, with an area of approximately 238 km2. It is one of the main islands of the Great Andaman group, a closely-set archipelago in the Bay of Bengal, adjoining the Andaman Sea. Middle Andaman is to its north, and South Andaman to the south. The islands of Ritchie's Archipelago lie some 20 km to the east. Port Blair, the capital of the Indian Union Territory of Andaman and Nicobar Islands, is located approximately 100 km to the south. ...more on Wikipedia about "Baratang"
The Coso Volcanic Field is located at the west edge of the Basin and Range province. Initiation of volcanism at Coso preceded the onset of Basin and Range crustal extension there, as expressed by normal faulting. The earlier of the two principal periods of volcanism began with the emplacement of basalt flows over a surface of little relief. Then, during the ensuing period of approximately 1.5 million years, eruptive activity included chemically more evolved rocks erupted upon a faulted terrain of substantial relief. Following a 1.5-million-year hiatus with few eruptions, a bimodal field of basalt lava flows and rhyolite lava domes and flows developed on Basin and Range terrain of essentially the same form as today's landscape. Many of the young basalt flows are intercanyon, occupying parts of the presentday drainage system. ...more on Wikipedia about "Coso Volcanic Field"
A Diatreme is a volcanic pipe or feature formed by a gas or volatile rich explosive magma. Diatremes often breach the surface and produce a tuff cone or a filled relatively shallow crater known as a maar or other volcanic pipes. The term has been applied more generally to any concave body of broken rock or breccia, generally formed by explosive or hydrostatic forces, whether or not it is related to volcanism. Some diatreme explosions may result from the interaction of hot magma and relatively shallow groundwater. ...more on Wikipedia about "Diatreme"
A dormant volcano is one which is not currently erupting, but is believed to still be capable of erupting. This contrasts with an extinct volcano, where it is believed that no future eruptions will occur. ...more on Wikipedia about "Dormant volcano"
An eruption column consists of hot volcanic ash emitted during an explosive volcanic eruption. The ash forms a column rising many kilometres into the air above the peak of the volcano. In the most explosive eruptions, the eruption column may rise over 40km, penetrating the stratosphere. Stratospheric injection of aerosolz by volcanoes is a major cause of short-term climate change. ...more on Wikipedia about "Eruption column"
Extinct volcano is a volcano which is not currently erupting and that is not considered likely to erupt in the future. ...more on Wikipedia about "Extinct volcano"
A glacier run (literal translation of Icelandic "jökulhlaup") is due to the eruption of a volcano under a glacier. The ice over the volcano melts because of the heat, causing water to form a lake under the remaining ice-cap. Then the ice-cap collapses, or the water breaks through the barrier in front of it, and there follows a more or less disastrous flooding of the land below the mountain. A glacier run is a type of lahar. ...more on Wikipedia about "Glacier run"
The Gueishan Island (literally 'turtle mountain') is an island belonging to Taiwan. It is located 10 km east of Toucheng Town. ...more on Wikipedia about "Gueishan Island"
Kelimutu is a small but well-known Indonesian volcano in central Flores Island with three summit crater lakes of varying colors. The western lake, Tiwi Ata Mbupu (Lake of Old People) is commonly blue. Tiwu Nua Muri Kooh Tai (Lake of Young Men and Maidens) and Tiwu Ata Polo (Bewitched, or Enchanted Lake), which share a common crater wall, are commonly green- and red-colored, respectively, although lake colors vary periodically. Active upwelling, probably fed by subaqueous fumaroles, occurs at the two eastern lakes. The scenic lakes are a popular tourist destination and have been the source of minor phreatic eruptions in historical time. The summit of the compound 1639-m-high Kelimutu volcano is elongated 2 km in a WNW-ESE direction; the older cones of Kelido and Kelibara are located respectively 3 km to the north and 2 km to the south. ...more on Wikipedia about "Kelimutu"
A lahar, is a type of mudflow composed of pyroclastic material and water that flows down from a volcano, typically along a river valley. ...more on Wikipedia about "Lahar"
Lake breakout is a geological term that refers to the collapse of a (usually high-altitude) lake. High-altitude lakes tend to form in volcanic craters – where they are called crater lakes – or in valleys dammed as the result of earthquakes or glacial or volcanic deposition. Lake breakouts are most common a few weeks or months after a volcanic eruption as a river becomes blocked by volcanic debris. ...more on Wikipedia about "Lake breakout"
A Maar (from Latin mare: the sea; also called "tuff cone") is a broad, low relief crater that is caused by a phreatic eruption or explosion caused by groundwater contact with hot lava or magma. The maar typically fills with water to form a relatively shallow crater lake. ...more on Wikipedia about "Maar" It's time to think about http://www.shortopedia.com.
Nevados de Quimsachata Volcano Group is a complex of volcanoes on a north-south alignment that straddles the border between Bolivia and Chile. It contains three peaks, all stratovolcanoes, and Quimsachata itself means three in the Aymara language of the local people. All three peaks, Acotango in the centre, Humarata and Capurata may have displayed Holocene activity. ...more on Wikipedia about "Nevadoes de Quimsachata"
Novarupta, meaning "new eruption", is a volcano located on the Alaska Peninsula in the Katmai area, about 290 miles southwest of Anchorage. Novarupta sits below Mount Katmai. Its eruption of June 6- June 8, 1912 was ten times more powerful than the 1980 eruption of Mount St. Helens and also lead to the formation of this 841 metre (2759 ft) volcano. ...more on Wikipedia about "Novarupta"
Pilot Butte is an extinct volcano located in Bend, Oregon. It is one of only two extinct volcanoes located within the boundaries of a U.S. city, the other being Mt. Tabor in Portland, Oregon. The Pilot Butte State Park covers nearly the entire butte. ...more on Wikipedia about "Pilot Butte"
Pyroclastic flows are a common and devastating result of some volcanic eruptions. They are fast moving fluidized bodies of hot gas, ash and rock (collectively known as tephra) which can travel away from the vent at up to 150 km/h. The gas is usually at a temperature of 100-800 degrees Celsius. The flows normally hug the ground and travel downhill under gravity, their speed depending upon the gradient of the slope and the size of the flow. ...more on Wikipedia about "Pyroclastic flow"
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. ...more on Wikipedia about "Subglacial volcano"
Submarine volcanoes and volcanic vents are common features on certain zones of the ocean floor. Some are active at the present time and, in shallow water, disclose their presence by blasting steam and rock-debris high above the surface of the sea. Many others lie at such great depths that the tremendous weight of the water above them results in high, confining pressure and prevents the formation and explosive release of steam and gases. Even very large, deepwater eruptions may not disturb the ocean surface. ...more on Wikipedia about "Submarine volcano"
Vailulu'u is a massive volcanic seamount, not discovered until 1975, which rises 4200 m from the sea floor to a depth of 590 m about one-third of the way between Ta'u and Rose islands at the eastern end of the American Samoas. The basaltic seamount, is considered to mark the current location of the Samoan hotspot. The summit of Vailulu'u contains a 2-km-wide, 400-m-deep oval-shaped caldera. Two principal rift zones extend east and west from the summit, parallel to the trend of the Samoan hotspot, and a third less prominent rift extends southest of the summit. ...more on Wikipedia about "Vailulu'u"
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A volcanic field is a spot of the earth's crust that is prone to localized volcanic activity. The San Francisco volcanic field in Arizona and the Auckland volcanic field in New Zealand are examples of this. ...more on Wikipedia about "Volcanic field"
A volcanic plug, also called a volcanic neck or lava neck, is a volcanic landform created when lava hardens within a vent on an active volcano. A plug can cause an extreme build-up of pressure if magma is trapped behind it, and this can sometimes lead to a devastating eruption. ...more on Wikipedia about "Volcanic plug"
A volcano is a geological landform (usually a mountain) where a substance, usually magma (rock of the Earth's interior made molten or liquid by extremely high temperatures along with a reduction in pressure and/or the introduction of water or other volatiles) erupts through the surface of a planet. Although there are numerous volcanoes (some very active) on the solar system's rocky planets and moons, on Earth at least, this phenomenon tends to occur near the boundaries of the continental plates. However, important exceptions exist in hotspot volcanoes. ...more on Wikipedia about "Volcano"
Three parallel Volcano warning schemes are used by the United States Geological Survey for different volcano ranges in the United States. They each have a base level for dormant-quiescent states and three grades of alert. ...more on Wikipedia about "Volcano warning schemes"
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