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Bárðarbunga IV - Holuhraun
Bárðarbunga (, alternative name Veiðivötn), is an active and productive stratovolcano located under Vatnajökull in Vatnajökull National Park which is Iceland's most extensive glacier. The second highest mountain in Iceland, above sea level, Bárðarbunga is also part of the Bárðarbunga-Veiðivötn volcanic system that is approximately long and wide. Bárðarbunga erupted in late August 2014, the eruption style effusive, which is common in Iceland, but had not been seen for a few years. Lava covered the surrounding landscape northwest of the Vatnajökull glacier. Description Bárðarbunga is a subglacial stratovolcano and central volcano under the ice cap of Vatnajökull glacier in the Vatnajökull National Park in Iceland. It is one of the six volcanic systems under Vatnajökull. The central volcano has a rim that rises to about above sea level, making it the second highest mountain in Iceland, being lower than Hvannadalshnjúkur. The caldera is about , up to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2014 Eruption Of Bárðarbunga
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Mýrdalsjökull
Mýrdalsjökull (pronounced , Icelandic for "(the) mire dale glacier" or "(the) mire valley glacier") is an ice cap on the top of the Katla volcano in the south of Iceland. It is to the north of the town of Vík í Mýrdal and to the east of the smaller ice cap Eyjafjallajökull. Between these two glaciers is the Fimmvörðuháls pass. The glacier contributes to the most serious natural hazard area of Iceland. Setting The icecap of the glacier covers an active volcano. The caldera of Katla has a diameter of and the volcano erupts usually every 40–80 years. The last eruption took place in 1918. Scientists are actively monitoring the volcano, particularly after the eruption of nearby Eyjafjallajökull began in April 2010. There is a further historic relationship with Eyjafjallajökull as the two glaciers were continuous as a single ice cap at the end of the 19th century and only separated into the larger Mýrdalsjökull and smaller Eyjafjallajökull in the middle of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Explosivity Index
The volcanic explosivity index (VEI) is a scale used to measure the size of explosive volcanic eruptions. It was devised by Christopher G. Newhall of the United States Geological Survey and Stephen Self in 1982. Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal") are used to determine the explosivity value. The scale is open-ended with the largest eruptions in history given a magnitude of 8. A value of 0 is given for non-explosive eruptions, defined as less than of tephra ejected; and 8 representing a supervolcanic eruption that can eject (240 cubic miles) of tephra and have a cloud column height of over . The scale is logarithmic, with each interval on the scale representing a tenfold increase in observed ejecta criteria, with the exception of between VEI-0, VEI-1 and VEI-2. Classification With indices running from 0 to 8, the VEI associated with an eruption is dependent on how much volcanic materia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genitive Case
In grammar, the genitive case ( abbreviated ) is the grammatical case that marks a word, usually a noun, as modifying another word, also usually a noun—thus indicating an attributive relationship of one noun to the other noun. A genitive can also serve purposes indicating other relationships. For example, some verbs may feature arguments in the genitive case; and the genitive case may also have adverbial uses (see adverbial genitive). The genitive construction includes the genitive case, but is a broader category. Placing a modifying noun in the genitive case is one way of indicating that it is related to a head noun, in a genitive construction. However, there are other ways to indicate a genitive construction. For example, many Afroasiatic languages place the head noun (rather than the modifying noun) in the construct state. Possessive grammatical constructions, including the possessive case, may be regarded as subsets of the genitive construction. For example, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Settlement Of Iceland
The settlement of Iceland ( ) is generally believed to have begun in the second half of the ninth century, when Norsemen, Norse settlers migrated across the North Atlantic. The reasons for the migration are uncertain: later in the Middle Ages Icelanders themselves tended to cite civil strife brought about by the ambitions of the Norway, Norwegian king Harald I of Norway, but modern historians focus on deeper factors, such as a shortage of arable land in Scandinavia. Unlike Great Britain and Ireland, Iceland was unsettled land and could be claimed without conflict with existing inhabitants. On the basis of by Ari Þorgilsson, and , histories dating from the twelfth and thirteenth centuries and providing a wealth of detail about the settlement, the years 870 and 874 have traditionally been considered the first years of settlement. However, these sources are largely unreliable in the details they provide about the settlement, and recent research focuses more heavily on archaeological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1996 Eruption Of Gjálp
Gjálp () is a hyaloclastite ridge (tindar) in Iceland under the Vatnajökull glacier shield. Its present form resulted from an eruption series in 1996 and it is probably part of the Grímsvötn volcanic system.Snæbjörn Guðmundsson: ''Vegavísir um jarðfræði Íslands.'' Reykjavík 2015, p. 280-281 However, not all the scientists were of this opinion, as seismic studies are consistent with a lateral dike intrusion at about depth from Bárðarbunga being the trigger event. This does not exclude a shallower secondary intrusion from Grímsvötn being important in the subaerial eruption itself. Importance The eruption was of importance, because it was for the first time that a subglacial eruption under a thick ice cover as well as the connected jökulhlaup could be observed and analyzed by modern technique. Geography Eruption location The subglacial eruption fissure is to be found in the northwest corner of Vatnajökull ice cap more or less halfway between the central ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grímsvötn
Grímsvötn (; ''vötn'' = "waters", singular: ) is an active volcano with a (partially subglacial) fissure system located in Vatnajökull National Park, Iceland. The central volcano is completely subglacial and located under the northwestern side of the Vatnajökull ice cap. The subglacial caldera is at , at an elevation of . Beneath the caldera is the magma chamber of the Grímsvötn volcano. Grímsvötn is a basaltic volcano which has the highest eruption frequency of all the volcanoes in Iceland. It has a southwest-northeast-trending fissure system. The massive climate-impacting Laki fissure eruption of 1783–1784 took place in a part of the same Grímsvötn-Laki volcanic system. Grímsvötn was erupting at the same time as Laki during 1783, but continued to erupt until 1785. Because most of the volcanic system lies underneath Vatnajökull, most of its eruptions have been subglacial and the interaction of magma and meltwater from the ice causes phreatomagmatic explosive acti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tungnafellsjökull
Tungnafellsjökull (, "''Tungna-fells glacier''" or "tongue-fells glacier") is a icecap glacier upon a volcano of the same name in Iceland. The volcano is also known as Vonarskarð. Geography It has an elevation of and is located north–west of the area of the Vatnajökull glacier under the Bárðarbunga central volcano. To its west is the volcano of Hofsjökull. The Tungnafellsjökull volcanic system is located in a desert area that is fairly inaccessible, with little vegetation, and large areas of sand and sandy ridges. Three glacial rivers drain the Tungnafellsjökull glacier. Geology It is the eastern most part of the Mid-Iceland belt and thus at the north–eastern corner of the Hreppar microplate. There are two central volcanoes, with the most southern being called Hágöngur and the most northern called here Tungnafellsjökull. Tungnafellsjökull has two calderas, with the western most Tungnafellsjökull caldera being topped by a glacier and the eastern most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selfoss (town)
Selfoss () is a town in southern Iceland on the banks of the Ölfusá river. It is the seat of the municipality of Árborg. The Icelandic Route 1 (Iceland), Route 1 runs through the town on its way between Hveragerði and Hella, Iceland, Hella. The town is a centre of commerce and small industries with a population of around 10,000 (2023), making it the largest residential area in South Iceland. History Overview Selfoss was settled by Þórir Ásason sometime after 1000, but the sagas of Icelanders mention that Ingólfur Arnarson was there during the winter of 873-74, under the Ingólfsfjall mountain, which is west of the Ölfusá river. In the summer of 1891, due to the lobbying of Tryggvi Gunnarsson, a member of the Alþing, the first suspension bridge was built over the Ölfusá. That was a major breakthrough in Icelandic infrastructure. The current bridge was built in 1945 after the original structure collapsed. The cabin built to house workers constructing the bridge i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tindfjallajökull
Tindfjallajökull (, alternatively Tindafjallajökull) is a glacier in the south of Iceland whose name is also given to the underlying stratovolcano. Tindfjöll (, "peak mountains") is a ridge that extends to the south of the glacier and is an alternative name for the volcano. The name of the glacier in Icelandic means "Tindfjöll glacier". Geography Its highest peak is Ýmir at , which takes its name from the giant Ýmir of Norse mythology. The peak Ýma is about to its east. The Thórólfsfell (Þórólfsfel) tuya at is on the southern flanks of Tindfjallajökull, about south of the glacier. Its eastern slopes abut the Þórsmörk ignimbrite. The western flank has a prominence near Austurdalur and the eastern flank that of Vestriöxl at . About to the north of Ýma is the peak of Sindri at . Ásgrindur at is a similar distance north of Ýmir. Volcano The central volcano is in diameter with a wide caldera and has erupted rocks of basaltic to rhyolitic composition. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Torfajökull
Torfajökull ( Icelandic for "Torfi's glacier"; ) is a rhyolitic stratovolcano, with a large caldera (central volcano) capped by a glacier of the same name and associated with a complex of subglacial volcanoes. Torfajökull last erupted in 1477 and consists of the largest area of silicic extrusive rocks in Iceland. This is now known to be due to a VEI 5 eruption 55,000 years ago. Geography The volcano is located north of Mýrdalsjökull and south of Þórisvatn Lake, Iceland. To its south-west is the volcano and glacier of Tindfjallajökull and almost directly to its west is the volcano of Hekla. Adjacent to the southern edge of its glacier of Torfajökull it has a peak of but the south-eastern caldera margin also extends to the glacier of Kaldaklofsjökull which is on the western slopes of a peak called Háskerðingur that is high. Laufafell dome at is at the north-western edge of the Torfajökull volcanic system and almost halfway between Hekla and the glacier of Torfajö ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Askja
Askja () is an active volcano situated in a remote part of the central highlands of Iceland. The name Askja refers to a complex of nested calderas within the surrounding Dyngjufjöll mountains, which rise to , ''askja'' meaning ''box'' or ''caldera'' in Icelandic. Geography The Askja central volcano is in diameter and is associated with the Askja volcanic system which has a long fissure swarm that extends north from beneath the Vatnajökull glacier towards the north coast of Iceland. The Hrúthálsar area which is to the north-east is now usually regarded as part of the system. The outer caldera of Askja, representing a prehistoric eruption, is about in area, and there is evidence of other later caldera-forming events within it. These include the main summit caldera, that is about in diameter, to its north-east the diameter Kollur caldera, and the 1875 Öskjuvatn caldera with a diameter of about . The main crater floor lies at about . The central volcano region i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
