Stati Uniti · Stratovulcano
Vulcano Shishaldin
Shishaldin
- Tipo
- Stratovulcano
- Altitudine
- 2857 m
- Ultima eruzione
- 2023
- Tipo
- Stratovulcano
- Paese
- Stati Uniti
- Regione
- Nord America / Aleutian Ridge Volcanic Arc
- Altitudine
- 2857 m
- Coordinate
- 54.756, -163.970
- Ultima eruzione
- 2023
- Contesto tettonico
- Zona di subduzione / Crosta continentale (> 25 km)
- Forma vulcanica
- Composito
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
The symmetrical glacier-covered Shishaldin in the Aleutian Islands is the westernmost of three large stratovolcanoes in the eastern half of Unimak Island. The Aleuts named the volcano Sisquk, meaning "mountain which points the way when I am lost." Constructed atop an older glacially dissected edifice, it is largely basaltic in composition. Remnants of an older edifice are exposed on the W and NE sides at 1,500-1,800 m elevation. There are over two dozen pyroclastic cones on its NW flank, which is covered 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. A steam plume often rises from the summit crater.
Sintesi da Wikipedia
Riassunto in ingleseShishaldin Volcano, or Mount Shishaldin, is one of six active volcanoes on Unimak Island in the eastern Aleutian Islands of Alaska. It is the highest mountain peak of the Aleutian Islands, rising to a height of 9,373 ft (2,857 m) above sea level. It is located within Alaska Maritime National Wildlife Refuge. Shishaldin's magma supply is generated via flux melting above the Aleutian Trench, where the Pacific Plate subducts beneath the North American Plate. Due to its remote location and frequently inclement weather, the Alaska Volcano Observatory (AVO) monitors the volcano remotely via satellite and a seismic network deployed in 1997. Shishaldin is one of the most active volcanoes in the Aleutian Islands, with 40 confirmed eruptions in the last 11,700 years. Notably, Shishaldin produced a sub-Plinian eruption in 1999.
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Storia delle eruzioni
51 registrateGlossarioCronologia dettagliata
- 2023VEI 3Osservata2023-07-11 – 2023-11-03
- 2019VEI 3Osservata2019-07-23 – 2020-05-04Summit crater
- 2014VEI 1Osservata2014-01-30 – 2015-07-03Summit crater
- 2008VEI 1Metodo non indicato2008-02-12 – 2008-02-12
- 2004VEI 2Osservata2004-02-17 – 2004-07-16
- 2000VEI 1Metodo non indicato2000-08-11 – fine sconosciutaSummit
- 1999VEI 3Osservata1999-03-13 – 1999-05-27
- 1999VEI 1Metodo non indicato1999-09-25 – 2000-02-04
- 1998VEI 1Osservata1998-11-04 – 1998-11-04
- 1997VEI 1Osservata1997-06-02 – 1997-06-02
- 1995VEI 3Osservata1995-12-23 – 1996-05-16
- 1993VEI 2Osservata1993-09-04 – 1993-10-29
- 1986VEI 2Osservata1986-03-19 – 1987-02-15
- 1981VEI ?Metodo non indicato1981-09-25 – fine sconosciuta
- 1979VEI 2Osservata1979-02-16 – fine sconosciuta
- 1978VEI 2Osservata1978-02-08 – 1978-02-09
- 1976VEI 2Osservata1976-01-16 – 1976-09-28
- 1975VEI 2Osservata1975-09-13 – 1975-10-26
- 1967VEI 2Osservata1967-01-28 – fine sconosciuta
- 1963VEI 2Osservata1963-12-28 – fine sconosciuta
- 1955VEI 2Osservata1955-07-16 – fine sconosciuta
- 1953VEI 2Osservata1953-10-04 – fine sconosciuta
- 1951VEI 2Osservata1951-04-16 – 1951-10-05
- 1948VEI 2Osservata1948-07-02 – fine sconosciuta
- 1946VEI 2Osservata1946-08-16 – 1947-01-16
- 1932VEI 2Osservata1932-02-01 – 1932-05-21
- 1929VEI 2Osservata1929-05-28 – 1929-06-23Summit and north flank
- 1928VEI 2Osservata1928-08-16 – fine sconosciuta
- 1927VEI ?Osservata1927-07-02 – fine sconosciuta
- 1925VEI ?Osservata1925-07-02 – fine sconosciuta
- 1922VEI 2Osservata1922-10-15 – fine sconosciuta
- 1912VEI ?Metodo non indicato1912-07-02 – fine sconosciuta
- 1901VEI ?Osservata1901-07-02 – fine sconosciuta
- 1899VEI ?Metodo non indicato1899-07-02 – fine sconosciuta
- 1898VEI 2Osservata1898-07-02 – fine sconosciuta
- 1897VEI ?Metodo non indicato1897-07-02 – fine sconosciuta
- 1883VEI 2Osservata1883-07-02 – fine sconosciuta
- 1880VEI ?Metodo non indicato1880-07-02 – 1881-07-02
- 1865VEI ?Metodo non indicato1865-07-02 – fine sconosciuta
- 1842VEI 2Osservata1842-07-02 – fine sconosciuta
- 1838VEI 2Osservata1838-07-02 – fine sconosciuta
- 1830VEI 3Osservata1830-11-16 – 1831-03-16
- 1827VEI 2Osservata1827-07-02 – 1829-07-02
- 1826VEI 0Osservata1826-07-02 – fine sconosciuta
- 1825VEI 2Osservata1825-07-02 – fine sconosciutaNE flank (1300 m)
- 1824VEI 3Osservata1824-07-02 – fine sconosciuta
- 1790VEI ?Metodo non indicato1790 – fine sconosciuta
- 1775VEI ?Metodo non indicato1775 – 1778
- 950VEI ?Stima geologica950 – fine sconosciuta
- 7050 a.C.VEI ?Stima geologica7050 a.C. – fine sconosciuta
- 7550 a.C.VEI ?Stima geologica7550 a.C. – fine sconosciuta
Vulcani nelle vicinanze
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