Stati Uniti · Duomo di lava
Vulcano Augustine
Augustine
- Tipo
- Duomo di lava
- Altitudine
- 1218 m
- Ultima eruzione
- 2006
- Tipo
- Duomo di lava
- Paese
- Stati Uniti
- Regione
- Nord America / Alaska Peninsula Volcanic Arc
- Altitudine
- 1218 m
- Coordinate
- 59.363, -153.435
- Ultima eruzione
- 2006
- Contesto tettonico
- Zona di subduzione / Crosta continentale (> 25 km)
- Forma vulcanica
- Composito
- Roccia principale
- Andesite / Andesite basaltica
Sintesi geologica
Augustine volcano, rising above Kamishak Bay in the southern Cook Inlet about 290 km SW of Anchorage, is the most active volcano of the eastern Aleutian arc. It consists of a complex of overlapping summit lava domes surrounded by an apron of volcaniclastic debris that descends to the sea on all sides. Few lava flows are exposed; the flanks consist mainly of debris-avalanche and pyroclastic-flow deposits formed by repeated collapse and regrowth of the summit. The latest episode of edifice collapse occurred during Augustine's large 1883 eruption; subsequent dome growth has restored the edifice to a height comparable to that prior to 1883. The oldest dated volcanic rocks on Augustine are more than 40,000 years old. At least 11 large debris avalanches have reached the sea during the past 1,800-2,000 years, and five major pumiceous tephras have been erupted during this interval. Recorded eruptions have typically consisted of explosive activity with emplacement of pumiceous pyroclastic-flow deposits followed by lava dome extrusion with associated block-and-ash flows.
Sintesi da Wikipedia
Riassunto in ingleseAugustine Volcano is a stratovolcano in Alaska consisting of a central complex of summit lava domes and flows surrounded by an apron of pyroclastic, lahar, avalanche, and ash deposits. The volcano forms Augustine Island, colloquially called Mount St. Augustine, in southwestern Cook Inlet in the Kenai Peninsula Borough of southcentral coastal Alaska, about 70 miles (113 km) west of Homer and about 175 miles (282 km) southwest of Anchorage.
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Storia delle eruzioni
22 registrateGlossarioCronologia dettagliata
- 2005VEI 3Osservata2005-12-09 – 2006-04-27
- 1986VEI 4Osservata1986-03-27 – 1986-08-31
- 1976VEI 4Osservata1976-01-22 – 1977-05-14
- 1971VEI 1Osservata1971-10-07 – 1971-10-08
- 1963VEI 2Osservata1963-10-11 – 1964-08-19
- 1935VEI 3Osservata1935-03-13 – 1935-08-18
- 1908VEI 1Osservata1908-07-02 – fine sconosciuta
- 1883VEI 4Osservata1883-10-06 – 1884-07-02
- 1812VEI 3Osservata1812-07-02 – fine sconosciuta
- 1650 (±100 anni)VEI ?Stima geologica1650 – fine sconosciuta
- 1540 (±100 anni)VEI 4Stima geologica1540 – fine sconosciuta
- 1230 (±50 anni)VEI ?Stima geologica1230 – fine sconosciuta
- 930 (±150 anni)VEI ?Stima geologica930 – fine sconosciuta
- 570 (±150 anni)VEI ?Stima geologica570 – fine sconosciuta
- 340 (±40 anni)VEI ?Stima geologica340 – fine sconosciuta
- 120 a.C. (±40 anni)VEI ?Stima geologica120 a.C. – fine sconosciuta
- 310 a.C. (±100 anni)VEI ?Stima geologica310 a.C. – fine sconosciuta
- 350 a.C. (±200 anni)VEI ?Stima geologica350 a.C. – fine sconosciuta
- 1820 a.C. (±300 anni)VEI ?Stima geologica1820 a.C. – fine sconosciuta
- 2040 a.C. (±300 anni)VEI ?Stima geologica2040 a.C. – fine sconosciuta
- 4150 a.C. (±100 anni)VEI ?Stima geologica4150 a.C. – fine sconosciuta
- 5420 a.C. (±50 anni)VEI ?Stima geologica5420 a.C. – fine sconosciuta
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