Stati Uniti · Stratovulcano
Vulcano Akutan
Akutan
- Tipo
- Stratovulcano
- Altitudine
- 1303 m
- Ultima eruzione
- 1992
- Tipo
- Stratovulcano
- Paese
- Stati Uniti
- Regione
- Nord America / Aleutian Ridge Volcanic Arc
- Altitudine
- 1303 m
- Coordinate
- 54.134, -165.986
- Ultima eruzione
- 1992
- Contesto tettonico
- Zona di subduzione / Crosta intermedia (15-25 km)
- Forma vulcanica
- Composito
- Roccia principale
- Basalto / Picrobasalto
Sintesi geologica
Akutan contains a 2-km-wide caldera with a large cinder cone in the NE part of the caldera that has been the source of frequent explosive eruptions and occasional lava effusion that covers the caldera floor. An older, largely buried caldera was formed during the late Pleistocene or early Holocene. Two volcanic centers are located on the NW flank. Lava Peak is of Pleistocene age, and a cinder cone lower on the flank produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. The 60-365 m deep younger caldera was formed during a major explosive eruption about 1,600 years ago and contains at least three lakes. A lava flow in 1978 traveled through a narrow breach in the north caldera rim almost to the coast. Fumaroles occur at the base of the caldera cinder cone, and hot springs are located NE of the caldera at the head of Hot Springs Bay valley and along the shores of Hot Springs Bay.
Sintesi da Wikipedia
Riassunto in ingleseMount Akutan, officially Akutan Peak, is a stratovolcano in the Aleutian Islands of Alaska. Akutan Peak, at 4,275 feet (1,303 m), is the highest point on the caldera of the Akutan stratovolcano. Akutan contains a 2 km-wide caldera formed during a major explosive eruption about 1600 years ago. Recent eruptive activity has originated from a large cinder cone on the NE part of the caldera. It has been the source of frequent explosive eruptions with occasional lava effusion that blankets the caldera floor. A lava flow in 1978 traveled through a narrow breach in the north caldera rim to within 2 km of the coast. A small lake occupies part of the caldera floor. Two volcanic centers are located on the NW flank: Lava Peak is of Pleistocene age; and, a cinder cone lower on the flank which produced a lava flow in 1852 that extended the shoreline of the island and forms Lava Point. An older, mostly buried caldera seems to have formed in Pleistocene or Holocene time, while the current caldera formed in a VEI-5 eruption c. 340 AD. AVO has recorded 33 confirmed eruptions at Akutan, making it the volcano with the most eruptions in Alaska.
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Storia delle eruzioni
47 registrateGlossarioCronologia dettagliata
- 1992VEI 2Osservata1992-03-08 – 1992-05-21
- 1992VEI 1Osservata1992-12-18 – 1992-12-18
- 1991VEI 2Osservata1991-09-15 – 1991-10-29
- 1990VEI 2Osservata1990-01-26 – 1990-01-26
- 1990VEI 2Osservata1990-09-06 – 1990-10-01
- 1989VEI 2Osservata1989-02-27 – 1989-03-28
- 1988VEI 2Osservata1988-03-26 – 1988-07-20
- 1987VEI 2Osservata1987-01-31 – 1987-06-24
- 1986VEI 2Osservata1986-03-18 – 1986-06-30
- 1982VEI 2Osservata1982-10-05 – 1983-05-16
- 1980VEI 2Osservata1980-07-03 – 1980-07-08
- 1978VEI 2Osservata1978-09-25 – 1978-10-16
- 1976VEI 2Osservata1976-10-15 – 1977-05-09
- 1974VEI 2Osservata1974-02-11 – fine sconosciutaWest flank ?
- 1973VEI 2Osservata1973-03-16 – 1973-05-16
- 1972VEI 2Metodo non indicato1972-09-16 – fine sconosciuta
- 1962VEI 2Osservata1962-11-05 – fine sconosciuta
- 1953VEI 2Osservata1953-07-02 – fine sconosciuta
- 1951VEI 2Osservata1951-10-16 – fine sconosciuta
- 1948VEI 2Osservata1948-04-29 – 1948-08-07
- 1946VEI 2Osservata1946-12-16 – 1947-01-16
- 1931VEI 2Osservata1931-05-16 – 1931-08-16
- 1929VEI 2Osservata1929-05-16 – fine sconosciuta
- 1927VEI 2Osservata1927-07-02 – 1928-07-02
- 1912VEI ?Metodo non indicato1912-07-02 – fine sconosciuta
- 1911VEI 2Osservata1911-07-02 – fine sconosciuta
- 1908VEI 0Osservata1908-02-22 – fine sconosciuta
- 1907VEI ?Osservata1907-07-02 – fine sconosciuta
- 1896VEI ?Osservata1896-07-02 – fine sconosciuta
- 1895VEI 2Osservata1895-08-01 – 1895-08-14
- 1892VEI 1Osservata1892-09-23 – fine sconosciuta
- 1887VEI 0Osservata1887-07-02 – fine sconosciuta
- 1883VEI 2Osservata1883-07-02 – fine sconosciuta
- 1867VEI ?Osservata1867-07-02 – fine sconosciuta
- 1865VEI ?Osservata1865-07-02 – fine sconosciuta
- 1862VEI ?Metodo non indicato1862-07-02 – fine sconosciuta
- 1852VEI ?Osservata1852-07-02 – fine sconosciutaNW flank (Lava Point)
- 1848VEI 2Osservata1848-03-05 – fine sconosciuta
- 1845VEI ?Metodo non indicato1845-07-02 – fine sconosciuta
- 1838VEI ?Metodo non indicato1838-07-02 – fine sconosciuta
- 1828VEI ?Metodo non indicato1828-07-02 – fine sconosciuta
- 1790VEI ?Metodo non indicato1790 – fine sconosciuta
- 1420 (±100 anni)VEI ?Stima geologica1420 – fine sconosciuta
- 550VEI ?Stima geologica550 – fine sconosciuta
- 340VEI 5Stima geologica340 – fine sconosciuta
- 4150 a.C.VEI ?Stima geologica4150 a.C. – fine sconosciuta
- 7620 a.C. (±300 anni)VEI ?Stima geologica7620 a.C. – fine sconosciuta
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