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Bárðarbunga
Bárðarbunga (), is a 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 a volcanic system that is approximately long and wide. Description Bárðarbunga is a subglacial stratovolcano under the ice cap of Vatnajökull glacier in the Vatnajökull National Park in Iceland. It rises to above sea level, making it the second highest mountain in Iceland, about lower than Hvannadalshnjúkur. The caldera is about 80 square kilometres, up to 10 km wide and about deep. The surrounding edges rise to 1,850 metres, but the base is on average close to 1,100 metres. The volcano is covered in ice to a depth of 850m, hiding the glacier-filled crater. The associated volcanic system and fissure swarm is about 190 km long and 25 km wide. Bárðarbunga was a little-known volcano in Iceland due to its remote location and infrequ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holuhraun
Holuhraun () is a lava field just north of the Vatnajökull ice cap, in the Highlands of Iceland, Icelandic Highlands, in Suður-Þingeyjarsýsla, Northeastern Region (Iceland), Northeastern Region, Iceland. The lava field was created by fissure vent, fissure eruptions. After a research expedition in 1880, the lava field was initially called ''Kvislarhraun'' . Four years later, it received its current name from geologist and geographer Þorvaldur Thoroddsen. Holuhraun was the site of a 2014–2015 eruption of Bárðarbunga, volcanic eruption which began on 29 August 2014 and produced a lava field of more than and – the largest in Iceland since 1783. Geography Holuhraun is situated at the southern end of Ódáðahraun , which is one of the largest lava fields in the country. The main volume of the Jökulsá á Fjöllum river flows from the eastern side of Holuhraun, in the Kverkfjöll area. Hrímalda , Urðarháls and Kistufell are to the west of Holuhraun, with Dyngjuháls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vatnaöldur
Vatnaöldur () is the name of a series of craters in the Suðurland region of Iceland. They are located in the Highlands of Iceland, northwest of the Veiðivötn and northeast of Landmannalaugar, within the municipality of Rangárþing ytra. It is part of the East volcanic zone (EVZ). The craters were formed during a series of eruptions in the volcanic system of the Bárðarbunga around the year 870. These eruptions, like those of the neighbouring Veiðivötn, were from about (or ) long volcanic fissures within the area of a lake. The mainly explosive eruptions emitted of tholeiite basalt.G. Larsen, Thor Thordarson: Phreatomagmatism in the Eastern Volcanic Zone; 25 July 2010 See also * List of volcanic eruptions in Iceland * Volcanism of Iceland * Geology of Iceland * List of volcanoes in Iceland This list of volcanoes in Iceland includes active and dormant volcanic mountains, of which 18 have erupted since human settlement of Iceland began around 900 AD. __TOC__ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grímsvötn
Grímsvötn (; ''vötn'' = "waters", singular: ) is a volcano with a (partially subglacial) fissure system located in Vatnajökull National Park, Iceland. The volcano itself 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 and has a southwest-northeast-trending fissure system. The massive climate-impacting Laki fissure eruption of 1783–1784 was a part of the same fissure 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 activity. Jökulhlaup Eruptions in the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veiðivötn
Veiðivötn (, "fishing lakes") is a volcanic lake region in the Highlands of central Iceland, where approximately 50 lakes fill two rows of fissure vents. Geologically, Veiðivötn is part of the Bárðarbunga volcanic system. In 6600 B.C., long before the settlement of Iceland, prehistoric eruptions from the region produced the Þjórsá Lava, the largest lava flow in Iceland, and the largest to have erupted anywhere on Earth during the Holocene. Veiðivötn's current landscape was created in 1477 by an explosive VEI-6 fissure eruption of tholeiitic basalt. It was the largest volcanic eruption in Iceland's recorded history. Today, many of the fissures from the 1477 eruption are filled with water lakes that have become popular for trout Trout are species of freshwater fish belonging to the genera '' Oncorhynchus'', '' Salmo'' and '' Salvelinus'', all of the subfamily Salmoninae of the family Salmonidae. The word ''trout'' is also used as part of the name of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fissure Vent
A fissure vent, also known as a volcanic fissure, eruption fissure or simply a fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is often a few metres wide and may be many kilometres long. Fissure vents can cause large flood basalts which run first in lava channels and later in lava tubes. After some time, the eruption tends to become focused at one or more spatter cones. Small fissure vents may not be easily discernible from the air, but the crater rows (see Laki) or the canyons (see Eldgjá) built up by some of them are. The dikes that feed fissures reach the surface from depths of a few kilometers and connect them to deeper magma reservoirs, often under volcanic centers. Fissures are usually found in or along rifts and rift zones, such as Iceland and the East African Rift. Fissure vents are often part of the structure of shield volcanoes. Iceland In Iceland, volcanic vents, which can be long fissures, of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caldera
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is gone. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface (from one to dozens of kilometers in diameter). Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018. Etymology The term ''caldera'' comes from Spanish ', and Latin ', meaning ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vatnajökull National Park
Vatnajökull National Park ( is, Vatnajökulsþjóðgarður ) is one of three national parks in Iceland. It encompasses all of Vatnajökull glacier and extensive surrounding areas. These include the national parks previously existing at Skaftafell in the southwest and Jökulsárgljúfur in the north. The unique qualities of Vatnajökull National Park are primarily its great variety of landscape features, created by the combined forces of rivers, glacial ice, and volcanic and geothermal activity. On 5 July 2019, Vatnajökull National Park was inscribed as a World Heritage Site. History Vatnajökull National Park was established on 7 June 2008. When established, the park covered an area of 12,000 km2, but with recent additions of Lakagígar, Langisjór, Krepputunga and Jökulsárlón (including its surrounding areas) it now covers 14,141 km2 or approximately 14% of Iceland, making it Europe's second largest national park in terms of area after Yugyd Va in Russia. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Þjórsá Lava
The Great Þjórsá Lava ( Icelandic: ''Þjórsárhraunið mikla'' ) is the largest lava flow in Iceland (by both area and volume) and the largest lava that is known to have erupted in a single eruption in the Holocene. It belongs to a group of lavas known as the Tungnaá lavas. It was erupted in the Veiðivötn region, Central Iceland, 8600 years BP (6600 BC). The crater area is covered by younger lavas and eruptives. The Þjórsá Lava does not appear on the surface until 70 km downstream of its supposed crater area. In the lowlands of South Iceland the lava has overflown wide areas, covering the districts Landsveit, Gnúpverjahreppur, Skeið and Flói. The main rivers of South Iceland, Þjórsá and Hvítá/ Ölfusá, stream along the borders of the lava to the east and west and the long beach between the river mouths is formed by the lava. The sea level seems to have been around lower than today when the lava was erupted. Along with the rising sea level the ocean has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2014 Eruption Of Bárðarbunga
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Moment Magnitude Scale
The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori. Similar to the local magnitude/Richter scale () defined by Charles Francis Richter in 1935, it uses a logarithmic scale; small earthquakes have approximately the same magnitudes on both scales. Despite the difference, news media often says "Richter scale" when referring to the moment magnitude scale. Moment magnitude () is considered the authoritative magnitude scale for ranking earthquakes by size. It is more directly related to the energy of an earthquake than other scales, and does not saturate—that is, it does not underestimate magnitudes as other scales do in certain conditions. It has become the standard scale used by seismological authorities like the U.S. Geological SurveyThe "USGS Ear ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earthquake Swarm
In seismology, an earthquake swarm is a sequence of seismic events occurring in a local area within a relatively short period. The time span used to define a swarm varies, but may be days, months, or years. Such an energy release is different from the situation when a major earthquake (main shock) is followed by a series of aftershocks: in earthquake swarms, no single earthquake in the sequence is obviously the main shock. In particular, a cluster of aftershocks occurring after a mainshock ''is not'' a swarm. History and generalities In the Ore Mountains (Erzgebirge), which form the border between the Czech Republic and Germany, western Bohemia and the Vogtland region, have been known since the 16th century as prone to frequent earthquake swarms, which typically last a few weeks to a few months. Austrian geologist Josef Knett, while studying in 1899 a swarm of about a hundred events felt in western Bohemia/Vogtland in January-February 1824, coined the noun ''Schwarmbeben'', ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
