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Katla (volcano)
Katla (Icelandic pronunciation: [ˈkʰahtla] ⓘ) is an active subglacial volcano in southern Iceland. This volcano has been very active historically with at least twenty documented major eruptions since 2920 BC. In its recent history though, Katla has been less active as the last major eruption occurred in 1918. These eruptions have had a Volcanic Explosivity Index (VEI) of between 4 and 5 on a scale of 0 to 8. In comparison, the Eyjafjallajökull 2010 eruption had a VEI of 4. Larger VEI-5 eruptions are comparable to Mount St. Helens 1980 eruption. These eruptions have produced very large glacial outburst floods. Several smaller (minor) events measuring VEI-1 and below have occurred since.
Katla is one of the largest volcanic sources of carbon dioxide (CO2) on Earth, accounting for up to 4% of total global volcanic carbon dioxide emissions.
Katla is one of the largest volcanoes in Iceland. It is situated to the north of Vík í Mýrdal and to the east of the smaller glacier Eyjafjallajökull. Its peak reaches 1,512 metres (4,961 ft) and is partially covered by the Mýrdalsjökull glacier. The system has an area of 595 km2 (230 sq mi). The Eldgjá canyon is part of the same volcanic system, and extends as a fissure swarm to the north-east. The lavas from this eruption in 939 to 940 almost reach the south eastern coast, although are partially buried.
The caldera of the Katla volcano has a diameter of 10 km (6 mi) and is covered with 200–700 metres (660–2,300 ft) of ice. The volcano normally erupts every 40–80 years. The flood discharge at the peak of an eruption in 1755 has been estimated at 200,000–400,000 m3/s (7.1–14.1 million cu ft/sec), comparable to the combined average discharge of the Amazon, Mississippi, Nile, and Yangtze rivers (about 266,000 m3/s (9.4 million cu ft/sec)).
The name Katla derives from the word ketill ("kettle"), referring to the form of the volcano. Katla is also used as a female first name.
There have been up to twenty three eruptions recorded for Katla since 920 CE. Only two people are known to have died because of events directly associated with one of these eruptions in 1755. The 1918 eruption of Katla started on the late afternoon of 12 October 1918 and lasted for 24 days, with the first day having the most dangerous events, including an extremely large flood with peak flow of 300,000 m3/s (11,000,000 cu ft/s). It has been graded a VEI 4 level eruption. The 1918 eruption resulted in extending the southern coast by 4 km (2.5 mi) due to laharic flood deposits.
Most of these eruptions resulted in glacial floods (jökulhlaups). Some Mýrdalsjökull jökulhlaups have been associated with catastrophic flooding which results from peak discharges of more than 100,000 m3/s (3,500,000 cu ft/s), which is ten to a hundred times the size of most jökulhlaups. Apart from the 1755 and 1918 eruptions already mentioned in this regard, both of which like the majority of large floods drained onto the Mýrdalssandur plain to the volcanoes south-east, an eruption in 822 drained from the north-east aspect of the caldera down the Markarfljót river flood plain to the mountain's south-west covering an area of 600 km2 (230 sq mi). This is a convoluted route that outputs on to a large flood plain, the Markarfljótsaurar. Before the Hringvegur (Iceland's Ring Road) was constructed in 1974, people feared traversing the plains in front of the volcano because of the frequent jökulhlaup (or glacier bursts) and the deep river crossings.
Katla has been showing signs of unrest since 1999, and geologists have concerns that it might erupt in the near future. The volcano's present dormancy is among the longest in its known history. Particularly, monitoring has been intensified following the March 2010 eruptions of a smaller neighbouring volcano, the Eyjafjallajökull glacier. The eruption of this nearby long-dormant volcano in March and April 2010 prompted fears among some geophysicists that it might trigger an eruption at the larger and more dangerous Katla. In the past 1,000 years, all three known eruptions of Eyjafjallajökull have triggered subsequent Katla eruptions.
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Katla (volcano)
Katla (Icelandic pronunciation: [ˈkʰahtla] ⓘ) is an active subglacial volcano in southern Iceland. This volcano has been very active historically with at least twenty documented major eruptions since 2920 BC. In its recent history though, Katla has been less active as the last major eruption occurred in 1918. These eruptions have had a Volcanic Explosivity Index (VEI) of between 4 and 5 on a scale of 0 to 8. In comparison, the Eyjafjallajökull 2010 eruption had a VEI of 4. Larger VEI-5 eruptions are comparable to Mount St. Helens 1980 eruption. These eruptions have produced very large glacial outburst floods. Several smaller (minor) events measuring VEI-1 and below have occurred since.
Katla is one of the largest volcanic sources of carbon dioxide (CO2) on Earth, accounting for up to 4% of total global volcanic carbon dioxide emissions.
Katla is one of the largest volcanoes in Iceland. It is situated to the north of Vík í Mýrdal and to the east of the smaller glacier Eyjafjallajökull. Its peak reaches 1,512 metres (4,961 ft) and is partially covered by the Mýrdalsjökull glacier. The system has an area of 595 km2 (230 sq mi). The Eldgjá canyon is part of the same volcanic system, and extends as a fissure swarm to the north-east. The lavas from this eruption in 939 to 940 almost reach the south eastern coast, although are partially buried.
The caldera of the Katla volcano has a diameter of 10 km (6 mi) and is covered with 200–700 metres (660–2,300 ft) of ice. The volcano normally erupts every 40–80 years. The flood discharge at the peak of an eruption in 1755 has been estimated at 200,000–400,000 m3/s (7.1–14.1 million cu ft/sec), comparable to the combined average discharge of the Amazon, Mississippi, Nile, and Yangtze rivers (about 266,000 m3/s (9.4 million cu ft/sec)).
The name Katla derives from the word ketill ("kettle"), referring to the form of the volcano. Katla is also used as a female first name.
There have been up to twenty three eruptions recorded for Katla since 920 CE. Only two people are known to have died because of events directly associated with one of these eruptions in 1755. The 1918 eruption of Katla started on the late afternoon of 12 October 1918 and lasted for 24 days, with the first day having the most dangerous events, including an extremely large flood with peak flow of 300,000 m3/s (11,000,000 cu ft/s). It has been graded a VEI 4 level eruption. The 1918 eruption resulted in extending the southern coast by 4 km (2.5 mi) due to laharic flood deposits.
Most of these eruptions resulted in glacial floods (jökulhlaups). Some Mýrdalsjökull jökulhlaups have been associated with catastrophic flooding which results from peak discharges of more than 100,000 m3/s (3,500,000 cu ft/s), which is ten to a hundred times the size of most jökulhlaups. Apart from the 1755 and 1918 eruptions already mentioned in this regard, both of which like the majority of large floods drained onto the Mýrdalssandur plain to the volcanoes south-east, an eruption in 822 drained from the north-east aspect of the caldera down the Markarfljót river flood plain to the mountain's south-west covering an area of 600 km2 (230 sq mi). This is a convoluted route that outputs on to a large flood plain, the Markarfljótsaurar. Before the Hringvegur (Iceland's Ring Road) was constructed in 1974, people feared traversing the plains in front of the volcano because of the frequent jökulhlaup (or glacier bursts) and the deep river crossings.
Katla has been showing signs of unrest since 1999, and geologists have concerns that it might erupt in the near future. The volcano's present dormancy is among the longest in its known history. Particularly, monitoring has been intensified following the March 2010 eruptions of a smaller neighbouring volcano, the Eyjafjallajökull glacier. The eruption of this nearby long-dormant volcano in March and April 2010 prompted fears among some geophysicists that it might trigger an eruption at the larger and more dangerous Katla. In the past 1,000 years, all three known eruptions of Eyjafjallajökull have triggered subsequent Katla eruptions.