La Grille: Difference between revisions
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[[File:TurdusBewsheriKeulemans.jpg|thumb|Comoro thrushes live in the IBA]] |
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{{unreferenced|date=May 2010}} |
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| ⚫ | La Grille shield volcano at the northern end of |
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==Description== |
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| ⚫ | La Grille is a shield volcano at the northern end of island and lacks a summit caldera like its larger and more well-known neighbour to the south, [[Karthala|Karthala volcano]]. The [[basaltic]] La Grille volcano also differs from Karthala in its abundance of [[pyroclastic cones]] up to {{Convert|800|m|ft|0|abbr=on}} in height. The cones were erupted along [[fissures]] running parallel to the summit ridge, which has an irregular profile and is elongated in a north-south direction, and from radial fissures that reach as far as the coast. Although the exact date of the last eruption of La Grille is unknown, lava flows covering its sides and not yet recolonized by vegetation suggest that the volcano last erupted only a few hundred years ago. Recent [[lava flows]], some possibly as young as a few hundred years, have reached the sea from fissures on the lower western, northern, and eastern flanks.<ref name=GVP>{{cite gvp|name=La Grille|vn=233001|accessdate=17 October 2016}}</ref> |
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==Geography== |
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| ⚫ | La Grille is located on the island of Grande Comore, a northern island of the Comoros archipelago in the [[Mozambique Channel]] in the Indian Ocean. The volcano is abutted on the south by [[Karthala]], another volcano rising to {{Convert|2361|m|ft|0|abbr=on}} meters. A road around the coast of Grande Comore runs along the east, north and west sides of La Grille, connecting [[Prince Said Ibrahim Airport]] to the west of the island. Many villages are located near the coast and on the volcano, where there are also electricity pylons. |
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1 Geography<br /> |
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La Grille appears as a mountain range running from north to south, reaching a slag height of {{Convert|800|m|ft|0|abbr=on}} meters on average, and covered in [[stratovolcano]] cones,<ref>{{cite web|url=http://www.ais-asecna.org/en/atlas/comores/moroni.htm|title=AIS ASECNA - Moroni (FMCH) aeronautical chart - COMORES|publisher=|accessdate=17 October 2016|archive-url=https://web.archive.org/web/20080216021328/http://www.ais-asecna.org/en/atlas/comores/moroni.htm|archive-date=16 February 2008|url-status=dead}}</ref> giving the volcano a maximum altitude of {{Convert|1087|m|ft|0|abbr=on}} meters.<ref name=GVP/> Unlike its neighbour Karthala, La Grille does not have [[caldera]]. Different eruptive [[Volcanic vent|vents]] are located along the fissures that run along the volcano from north to south, parallel to the ridge of the mountain, and other cracks along the coast. Lava basalt sometimes escapes from these eruptive vents, sometimes reaching the sea to the east, north and west sides of the volcano. Many lava flows are still visible as few are rapidly recolonized by tropical Coconut trees on the island. |
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2 History<br /> |
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===Important Bird Area=== |
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3 Appendices<br /> |
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An 8,725 ha tract encompassing the higher slopes and summit of the mountain has been designated an [[Important Bird Area]] (IBA) by [[BirdLife International]] because it supports populations of [[Comoro olive pigeon]]s, [[Comoro blue pigeon]]s, [[Malagasy harrier]]s, [[Grand Comoro brush warbler]]s, [[Grand Comoro bulbul]]s, [[Comoro thrush]]es, [[Humblot's sunbird]]s and [[red-headed fody|red-headed fodies]].<ref name=bli>{{cite web |url=http://datazone.birdlife.org/site/factsheet/la-grille-mountains-iba-comoros|title= La Grille Mountains|author=<!--Not stated--> |date=2021|website= BirdLife Data Zone|publisher= BirdLife International|access-date= 2 March 2021}}</ref> |
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3.1 External Links<br /> |
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{{Global Volcanism Program}} |
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{{coord|11.47|S|43.33|E|type:mountain|display=title}} |
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===Geography=== |
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The mountain range, elongated in a north-south, consists of a [[stratovolcano]] cones covered slag height of 800 meters on average, giving the volcano a maximum altitude of 1087 meters[http://www.volcano.si.edu/world/volcano.cfm?vnum=0303-001]. Unlike its neighbor Karthala, La Grille does not have [[caldera]]. Different eruptive [[vents]] are organized along the fissures that run the volcano from north to south, parallel to the ridge of the mountain, and other cracks along the coast winner. Of these eruptive vents escaped from lava [[basalt]] which sometimes reaches the sea on the east side, north and west of the volcano and some of which are still visible as few recolonized by tropical vegetation on the island. |
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===History=== |
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Although the exact date of the last eruption of The CA is unknown, it seems that the volcano is erupting there are only a few hundred years because of some lava flows covering its sides and still not recolonized by vegetation1. |
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Schedules [change] |
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===External Links=== |
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* [http://www.volcano.si.edu/world/volcano.cfm?vnum=0303-001 Global Volcanism Program - La Grille] |
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=== Références === |
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{{DEFAULTSORT:Grille, La}} |
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{{Portail|montagne|volcanisme|Comores}} |
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[[Category:Volcanoes of the Comoros]] |
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[[Category:Polygenetic shield volcanoes]] |
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[[Category:Hotspot volcanoes]] |
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[[Category:Important Bird Areas of the Comoros]] |
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[[Category:List_of_volcanoes_in_Comoros]] |
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[[Catégorie:Volcan bouclier]] |
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[[Catégorie:Stratovolcan]] |
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[[Catégorie:Grande Comore]] |
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{{Comoros-geo-stub}} |
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[[fr:La Grille]] |
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[[sk:La Grille]] |
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Latest revision as of 00:40, 24 June 2021
La Grille is a volcano in the Comoros archipelago on the island of Grande Comore (also known as Ngazidja).
Description[edit]
La Grille is a shield volcano at the northern end of island and lacks a summit caldera like its larger and more well-known neighbour to the south, Karthala volcano. The basaltic La Grille volcano also differs from Karthala in its abundance of pyroclastic cones up to 800 m (2,625 ft) in height. The cones were erupted along fissures running parallel to the summit ridge, which has an irregular profile and is elongated in a north-south direction, and from radial fissures that reach as far as the coast. Although the exact date of the last eruption of La Grille is unknown, lava flows covering its sides and not yet recolonized by vegetation suggest that the volcano last erupted only a few hundred years ago. Recent lava flows, some possibly as young as a few hundred years, have reached the sea from fissures on the lower western, northern, and eastern flanks.[1]
Geography[edit]
La Grille is located on the island of Grande Comore, a northern island of the Comoros archipelago in the Mozambique Channel in the Indian Ocean. The volcano is abutted on the south by Karthala, another volcano rising to 2,361 m (7,746 ft) meters. A road around the coast of Grande Comore runs along the east, north and west sides of La Grille, connecting Prince Said Ibrahim Airport to the west of the island. Many villages are located near the coast and on the volcano, where there are also electricity pylons.
La Grille appears as a mountain range running from north to south, reaching a slag height of 800 m (2,625 ft) meters on average, and covered in stratovolcano cones,[2] giving the volcano a maximum altitude of 1,087 m (3,566 ft) meters.[1] Unlike its neighbour Karthala, La Grille does not have caldera. Different eruptive vents are located along the fissures that run along the volcano from north to south, parallel to the ridge of the mountain, and other cracks along the coast. Lava basalt sometimes escapes from these eruptive vents, sometimes reaching the sea to the east, north and west sides of the volcano. Many lava flows are still visible as few are rapidly recolonized by tropical Coconut trees on the island.
Important Bird Area[edit]
An 8,725 ha tract encompassing the higher slopes and summit of the mountain has been designated an Important Bird Area (IBA) by BirdLife International because it supports populations of Comoro olive pigeons, Comoro blue pigeons, Malagasy harriers, Grand Comoro brush warblers, Grand Comoro bulbuls, Comoro thrushes, Humblot's sunbirds and red-headed fodies.[3]
References[edit]
- ^ a b "La Grille". Global Volcanism Program. Smithsonian Institution. Retrieved 17 October 2016.
- ^ "AIS ASECNA - Moroni (FMCH) aeronautical chart - COMORES". Archived from the original on 16 February 2008. Retrieved 17 October 2016.
- ^ "La Grille Mountains". BirdLife Data Zone. BirdLife International. 2021. Retrieved 2 March 2021.
- Siebert L, Simkin T (2002–present). Volcanoes of the World: an Illustrated Catalog of Holocene Volcanoes and their Eruptions. Smithsonian Institution, Global Volcanism Program Digital Information Series, GVP-3 (http://www.volcano.si.edu).
11°28′S 43°20′E / 11.47°S 43.33°E
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