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Vulcano Augustine

Augustine

Duomo di lava · United States · 1218 m

Augustine in Kamishak Bay in the southern Cook Inlet 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 deposits that descend to the sea on all sides. This 1986 view from the NW shows Augustine reflected in a shallow lagoon separating the small west island from the main island. Twentieth-century eruptions have included explosive activity with pyroclastic flows and lava dome growth.
Augustine in Kamishak Bay in the southern Cook Inlet 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 deposits that descend to the sea on all sides. This 1986 view from the NW shows Augustine reflected in a shallow lagoon separating the small west island from the main island. Twentieth-century eruptions have included explosive activity with pyroclastic flows and lava dome growth. · Foto: Photo by Lee Siebert, 1986 (Smithsonian Institution). · Wikimedia Commons
Tipo
Duomo di lava
Paese
United States
Regione
North America Volcanic Regions / Alaska Peninsula Volcanic Arc
Altitudine
1218 m
Coordinate
59.363, -153.435
Ultima eruzione
2006
Contesto tettonico
Subduction zone / Continental crust (> 25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
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 inglese

Augustine 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

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
5420 BCE~5172 BCE · 1 eruzioni · VEI max. ?4182 BCE~3935 BCE · 1 eruzioni · VEI max. ?2202 BCE~1955 BCE · 1 eruzioni · VEI max. ?1955 BCE~1707 BCE · 1 eruzioni · VEI max. ?470 BCE~222 BCE · 2 eruzioni · VEI max. ?222 BCE~25 · 1 eruzioni · VEI max. ?273~520 · 1 eruzioni · VEI max. ?520~768 · 1 eruzioni · VEI max. ?768~1015 · 1 eruzioni · VEI max. ?1015~1263 · 1 eruzioni · VEI max. ?1510~1758 · 2 eruzioni · VEI max. 41758~2005 · 9 eruzioni · VEI max. 45420 BCE3687 BCE1707 BCE251758

Cronologia dettagliata

  1. 2005VEI 3Osservata
    2005-12-09 – 2006-04-27
  2. 1986VEI 4Osservata
    1986-03-27 – 1986-08-31
  3. 1976VEI 4Osservata
    1976-01-22 – 1977-05-14
  4. 1971VEI 1Osservata
    1971-10-07 – 1971-10-08
  5. 1963VEI 2Osservata
    1963-10-11 – 1964-08-19
  6. 1935VEI 3Osservata
    1935-03-13 – 1935-08-18
  7. 1908VEI 1Osservata
    1908 – In corso
  8. 1883VEI 4Osservata
    1883-10-06 – 1884
  9. 1812VEI 3Osservata
    1812 – In corso
  10. 1650 (±100 anni)VEI ?Stima geologica
    1650 – In corso
  11. 1540 (±100 anni)VEI 4Stima geologica
    1540 – In corso
  12. 1230 (±50 anni)VEI ?Stima geologica
    1230 – In corso
  13. 930 (±150 anni)VEI ?Stima geologica
    930 – In corso
  14. 570 (±150 anni)VEI ?Stima geologica
    570 – In corso
  15. 340 (±40 anni)VEI ?Stima geologica
    340 – In corso
  16. 120 a.C. (±40 anni)VEI ?Stima geologica
    BCE 120 – In corso
  17. 310 a.C. (±100 anni)VEI ?Stima geologica
    BCE 310 – In corso
  18. 350 a.C. (±200 anni)VEI ?Stima geologica
    BCE 350 – In corso
  19. 1820 a.C. (±300 anni)VEI ?Stima geologica
    BCE 1820 – In corso
  20. 2040 a.C. (±300 anni)VEI ?Stima geologica
    BCE 2040 – In corso
  21. 4150 a.C. (±100 anni)VEI ?Stima geologica
    BCE 4150 – In corso
  22. 5420 a.C. (±50 anni)VEI ?Stima geologica
    BCE 5420 – In corso

Link esterni

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