Irazú Volcano

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Irazú Volcano
File:Irazu Volcano.JPG
Irazú Crater
Highest point
Elevation Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). [1]
Coordinates Lua error in package.lua at line 80: module 'strict' not found. [1]
Geography
Parent range Cordillera Central
Geology
Mountain type Complex Stratovolcano
Last eruption December 1994[1]

The Irazú Volcano (Spanish: Volcán Irazú) is an active volcano in Costa Rica, situated in the Cordillera Central close to the city of Cartago.

The name could come from either the combination of "ara" (point) and "tzu" (thunder)[clarification needed] or a corruption of Iztarú, which was the name of an indigenous village on the flanks of the volcano. In Costa Rica it is known by the name of "El Coloso" (The Colossus) due to the catastrophes that it has provoked in the past.

File:DirkvdM irazu 3.jpg
A detail of the crater edge

The volcano's summit has several craters, one of which contains Diego de la Haya, a green crater lake of variable depth. At 11,260 feet (3,432 m), the Irazú Volcano is the highest active volcano in Costa Rica.[2] It is easily visited from San José, with a road leading right up to the summit craters and a weekly bus service to the top. It is thus a popular tourist spot. The summit of the volcano also houses a few television transmitters for television stations in San José.

From the top it is possible to see both the Atlantic and Pacific Oceans on a clear day.[3] However, such clear days are rare, and the volcano's summit is usually cloud-covered.

The volcano is contained within the Irazú Volcano National Park, which spreads across 5,705 acres (2,300 ha). The national park contains both primary and secondary montane forests and is home to armadillos, owls, rabbits, foxes, woodpeckers, and hummingbirds.[4]

Geology

The Irazú volcano is a complex volcanic shield. It is the highest active volcano in Costa Rica, and has an area of 500 km2 (190 sq mi). It has an irregular subconic shape, and temperatures at its summit vary between 3 and 17 °C (37 and 63 °F), with a record low of -6°C(21.2°F) and a record high of 27°C(80.6°F). Irazu volcano is a stratovolcano with a summit elevation of Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value).. Its five craters are easily differentiated.[1] The most important ones, because of their activity, are The Main Crater and the Diego de la Haya crater. The Main Crater is almost circular, has very inclined walls and it measures Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). in diameter and Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). deep. The Diego de la Haya crater is Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). in diameter and Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). deep. Other craters are Playa Hermosa, La Laguna, and El Piroclastico.[citation needed]

Irazú is the southernmost of the ten Quaternary volcanoes which form a northwest-trending line through central and northern Costa Rica.[3] Radioactive dating has shown an age of at least 854,000 years with eruption peaks at 570,000 years and the most recent active phase from 136,000 years to present. The most recent activity includes lava flows along with strombolian and phreatomagmatic explosions.[3] Lava types include basalt and andesite erupted during different events suggesting the volcano is fed by two distinct magma chambers.[3] Scientists believed that pulses of magma mixed together in the chamber before climbing upward—a process estimated to take several thousands of years. But Columbia University volcanologists found that the eruption of Costa Rica’s Irazu volcano in 1963 was likely triggered by magma that took a nonstop route from the mantle over just a few months. Study authors called it the highway from hell.[5]

x177px
A panoramic view of the Irazú Volcano
Panorama of Irazú Volcano
Panorama of Irazú Volcano.

Eruptive history

Irazú has erupted frequently in historical times — at least 23 times since its first historically recorded [6] eruption in 1723. Its most famous recent eruption began March 19, 1963 (continuing until 1965) on the day US President John F. Kennedy started a state visit to Costa Rica. It showered the capital San José and much of the central highlands of Costa Rica with ash.[citation needed]

Its historical eruptions generally have VEIs of 1 to 3. All historical eruptions have been explosive, and there have been many phreatic eruptions, and some have produced pyroclastic flows. The latest eruption lasted only 1 day, and occurred on December 8, 1994. It occurred at a flank vent and was a phreatic eruption, which produced lahars.[6]

Gallery

  • Sunset from the Summit, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Sunset from the summit

  • Top View of Diego de la Haya, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Top view of Diego de la Haya

  • Sunset at Diego de la Haya Crater, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Sunset at Diego de la Haya crater

  • Main Crater Lagoon 2, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Main crater lagoon 2

  • Main Crater Lagoon 1, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Main crater lagoon 1

  • Inside Irazu Volcano, Costa Rica (Diego de la Haya Crater) - Daniel Vargas.jpg

    Inside Diego de la Haya

  • Friendly Critter 2, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    White-nosed coati at Irazú

  • Extinct Crater, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Extinct crater

  • Crater Bridge, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Crater bridge (division)

  • Distant Diego de la Haya, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Distant Diego de la Haya crater

  • Diego de la Haya Lagoon, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Diego de la Haya lagoon

  • Great Walls of the Main Crater, Irazu Volcano, Costa Rica - Daniel Vargas.jpg

    Great crater wall

  • Distant wide view of Irazu volcano

  • Wide view of Irazu volcano

  • Irazu Volcano.JPG

    Irazu Crater

  • Irazu3-9MGLeonard1963.jpg
  • Irazu3-11MGLeonard1963.jpg
  • Irazu3-13MGLeonard1963.jpg
  • Irazu3-15MGLeonard1963.jpg
  • Irazu3-16MGLeonard1963.jpg
  • Irazu4-10MGLeonard1963.jpg
  • Irazu4-13MGLeonard1963.jpg

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 http://www.rci.rutgers.edu/~carr/Alv%20Irazu.pdf Guillermo E. Alvarado, el. al., 2006, Recent volcanic history of Irazú volcano, Costa Rica: Alternation and mixing of two magma batches, and pervasive mixing Geological Society of America, Special Paper 412
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Ruprecht P, Plank T. Feeding andesitic eruptions with a high-speed connection from the mantle. Nature. 2013;500(7460):68-72.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.

External links

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