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Mount Kanaga

Kanaga

Stratovulcano · United States · 1307 m

Kanaga is situated within the Kanaton caldera at the northern tip of Kanaga Island. The caldera rim forms a 760-m-high arcuate ridge, which can be seen S and E (left) of Kanaga. The two flows that reach the coast on either side of the sea cliffs in the lower center were produced during an eruptive period from mid-1993 through 1995.
Kanaga is situated within the Kanaton caldera at the northern tip of Kanaga Island. The caldera rim forms a 760-m-high arcuate ridge, which can be seen S and E (left) of Kanaga. The two flows that reach the coast on either side of the sea cliffs in the lower center were produced during an eruptive period from mid-1993 through 1995. · Foto: Photo by Chris Nye, 2000 (Alaska Division of Geological & Geophysical Surveys, Alaska Volcano Observatory). · Wikimedia Commons
Tipo
Stratovulcano
Paese
United States
Regione
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Altitudine
1307 m
Coordinate
51.923, -177.168
Ultima eruzione
2023
Contesto tettonico
Subduction zone / Intermediate crust (15-25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

Symmetrical Kanaga stratovolcano is situated within the Kanaton caldera at the northern tip of Kanaga Island. The caldera rim forms a 760-m-high arcuate ridge south and east of Kanaga; a lake occupies part of the SE caldera floor. The volume of subaerial dacitic tuff is smaller than would typically be associated with caldera collapse, and deposits of a massive submarine debris avalanche associated with edifice collapse extend nearly 30 km to the NNW. Several fresh lava flows from historical or late prehistorical time descend the flanks of Kanaga, in some cases to the sea. Historical eruptions, most of which are poorly documented, have been recorded since 1763. Kanaga is also noted petrologically for ultramafic inclusions within an outcrop of alkaline basalt SW of the volcano. Fumarolic activity occurs in a circular, 200-m-wide, 60-m-deep summit crater and produces vapor plumes sometimes seen on clear days from Adak, 50 km to the east.

Sintesi da Wikipedia

Riassunto in inglese

Kanaga Volcano, or Mount Kanaga, is a stratovolcano at the northern tip of Kanaga Island in the Aleutian Islands, Alaska. It is situated within a caldera, which forms the arcuate Kanaton Ridge south and east of Kanaga. A crater lake occupies part of the SE caldera floor. The summit of Kanaga has a crater with fumarolic activity.

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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
7300 BCE~6989 BCE · 1 eruzioni · VEI max. ?4814 BCE~4503 BCE · 1 eruzioni · VEI max. ?2328 BCE~2017 BCE · 2 eruzioni · VEI max. ?2017 BCE~1706 BCE · 1 eruzioni · VEI max. ?1706 BCE~1395 BCE · 1 eruzioni · VEI max. ?158~469 · 1 eruzioni · VEI max. ?780~1091 · 1 eruzioni · VEI max. ?1091~1401 · 2 eruzioni · VEI max. ?1712~2023 · 12 eruzioni · VEI max. 27300 BCE5125 BCE2638 BCE463 BCE1712

Cronologia dettagliata

  1. 2023VEI 1Osservata
    2023-12-18 – 2023-12-18
  2. 2012VEI 2Osservata
    2012-02-18 – 2012-02-18
    E-W fissure at summit crater
  3. 1996VEI 1Stima geologica
    1996-06-11 – In corso
  4. 1995VEI 2Osservata
    1995-06-19 – 1995-06-23
  5. 1994VEI 2Osservata
    1994-01-05 – 1994-11-26
  6. 1942VEI 1Osservata
    1942 – In corso
  7. 1906VEI ?Osservata
    1906-05 – In corso
    Summit, upper SW flank
  8. 1904VEI 0Osservata
    1904 – In corso
    Upper south flank ?
  9. 1829VEI ?Stima geologica
    1829 – In corso
  10. 1827VEI ?Stima geologica
    1827 – In corso
  11. 1783VEI ?Osservata
    1783 – 1787
  12. 1763VEI ?Stima geologica
    1763 – In corso
  13. 1400 (±50 anni)VEI ?Stima geologica
    1400 – In corso
  14. 1150 (±100 anni)VEI ?Stima geologica
    1150 – In corso
  15. 850 (±200 anni)VEI ?Stima geologica
    850 – In corso
  16. 200 (±150 anni)VEI ?Stima geologica
    200 – In corso
  17. 1550 a.C. (±100 anni)VEI ?Stima geologica
    BCE 1550 – In corso
  18. 1900 a.C. (±300 anni)VEI ?Stima geologica
    BCE 1900 – In corso
  19. 2150 a.C. (±200 anni)VEI ?Stima geologica
    BCE 2150 – In corso
  20. 2300 a.C. (±150 anni)VEI ?Stima geologica
    BCE 2300 – In corso
  21. 4700 a.C. (±150 anni)VEI ?Stima geologica
    BCE 4700 – In corso
  22. 7300 a.C. (±500 anni)VEI ?Stima geologica
    BCE 7300 – In corso

Link esterni

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