Shishaldin Volcano
Updated: 15 mai 2024 02:09 GMT -
Stratovolcano 2857 m / 9,373 ft
Aleutian Islands, Alaska, 54.76°N / -163.97°W
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Aleutian Islands, Alaska, 54.76°N / -163.97°W
Condition actuelle: en vigilance - niveau agité (2 sur 5)
Last update: 21 févr. 2024 (Smithsonian / USGS Weekly Volcanic Activity Report)
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Eruptions du volcan Shishaldin: 2023 (Jul 12-ongoing), 2019 (Jul 23 - 2020 May 4), 2014-15, 2008 (?), 2004, 2002, 2000, 1999, 1997, 1995, 1993, 1986-87, 1981 (?), 1979, 1978, 1976, 1975, 1967, 1963, 1955, 1953, 1951, 1948, 1946-47, 1932, 1929, 1928, 1927, 1925, 1922, 1912 (?), 1901, 1899 (?), 1898, 1897 (?), 1883, 1880-81, 1865 (?), 1842, 1838, 1830, 1927-29, 1826, 1825, 1824, 1790 (?), 1775-78
Derniers séismes proches
| Heure | Mag. / Profondeur | Distance / Lieu | |||
Introduction
The beautifully symmetrical volcano of Shishaldin is the highest and one of the most active volcanoes of the Aleutian Islands. The 2857-m-high, glacier-covered volcano is the westernmost of three large stratovolcanoes along an E-W line in the eastern half of Unimak Island. The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." A steady steam plume rises from its small summit crater. Constructed atop an older glacially dissected volcano, Shishaldin is Holocene in age and largely basaltic in composition. Remnants of an older ancestral volcano are exposed on the west and NE sides at 1500-1800 m elevation. Shishaldin contains over two dozen pyroclastic cones on its NW flank, which is blanketed by massive aa lava flows. Frequent explosive activity, primarily consisting of strombolian ash eruptions from the small summit crater, but sometimes producing lava flows, has been recorded since the 18th century.---
Smithsonian / GVP volcano information
Shishaldin Volcano Photos
La chaîne de volcans sur Unimak, de gauche à droite : Roundtop Mountain, Isanotski, Pogromni et Shishaldin. (Photo: marcofulle)
À l'exception de la partie la plus haute, les flancs supérieurs de Shishaldin sont recouverts de glaciers. Leur écoulement rapide entraîne des crevasses intenses. (Photo:...
Le cône parfait du volcan Shishaldin s'élève au-dessus d'un ensemble de nuages stratocumuls. Volcan Pogromni à l'extrême droite. (Photo: marcofulle)
Alors que Shishaldin est un superbe exemple de stratovolcan jeune et symétrique, l'Isanotski, beaucoup plus ancien, est irrégulier et profondément érodé. (Photo: marcoful...
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