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Monte Makushin

Makushin

Stratovulcano · United States · 1800 m

Makushin is a glaciated volcano on northern Unalaska Island. This 2 March 1987 view from the NE shows a small plume originating from a vent on the left side of the broad summit and drifting about 3 km WNW. The summit contains a 2-km-wide caldera. Minor explosive eruptions have occurred during historical time.
Makushin is a glaciated volcano on northern Unalaska Island. This 2 March 1987 view from the NE shows a small plume originating from a vent on the left side of the broad summit and drifting about 3 km WNW. The summit contains a 2-km-wide caldera. Minor explosive eruptions have occurred during historical time. · Foto: Photo by Harold Wilson (Peninsula Airways), 1987 (courtesy of John Reeder, Alaska Div. Geology Geophysical Surveys). · Wikimedia Commons
Tipo
Stratovulcano
Paese
United States
Regione
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Altitudine
1800 m
Coordinate
53.891, -166.923
Ultima eruzione
1995
Contesto tettonico
Subduction zone / Intermediate crust (15-25 km)
Forma vulcanica
Composite
Roccia principale
Andesite / Basaltic Andesite
Sintesi geologica

The ice-covered Makushin volcano on northern Unalaska Island is capped by a 2.5 km caldera. Its broad, dome-like structure contrasts with the steep-sided profiles of most other Aleutian stratovolcanoes. Much of the edifice was formed during the Pleistocene, but the caldera (which formed about 8,000 years ago), Sugarloaf cone on the ENE flank, and a cluster of about a dozen explosion pits and cinder cones at Point Kadin on the WNW flank, are of Holocene age. A broad band of NE-SW-trending vents cuts across the volcano. The composite Pakushin cone, with multiple summit craters, lies 8 km SW. Table Top (Pleistocene, 68 +/- 14 ka) and Wide Bay (Holocene) cinder cones are about 20 km ENE on the peninsula across the bay from the City of Unalaska. Frequent explosive eruptions have occurred during the past 4,000 years, sometimes accompanied by pyroclastic flows and surges. Geothermal areas are found in the summit caldera and on the SE and E flanks. Small-to-moderate explosive eruptions have been recorded since 1786.

Sintesi da Wikipedia

Il Monte Makushin è uno stratovulcano posto nella parte settentrionale dell'Isola di Unalaska nelle Aleutine.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
6650 BCE~6362 BCE · 1 eruzioni · VEI max. ?6362 BCE~6074 BCE · 1 eruzioni · VEI max. 53768 BCE~3480 BCE · 1 eruzioni · VEI max. 41751 BCE~1463 BCE · 1 eruzioni · VEI max. ?598 BCE~310 BCE · 1 eruzioni · VEI max. ?1131~1419 · 1 eruzioni · VEI max. ?1707~1995 · 21 eruzioni · VEI max. 36650 BCE4633 BCE2327 BCE310 BCE1707

Cronologia dettagliata

  1. 1995VEI 1Osservata
    1995-01-30 – 1995-01-30
  2. 1993VEI 1Osservata
    1993-08-16 – 1994-01-19
  3. 1987VEI 1Osservata
    1987-03-02 – 1987-03-02
  4. 1980VEI 1Osservata
    1980-05-01 – 1980-07-04
    SE side of summit
  5. 1952VEI ?Stima geologica
    1952-07-02 – In corso
  6. 1951VEI 1Osservata
    1951-12-20 – In corso
  7. 1938VEI 2Osservata
    1938-10 – In corso
  8. 1926VEI 2Osservata
    1926-12-30 – In corso
  9. 1912VEI ?Stima geologica
    1912 – In corso
  10. 1907VEI ?Osservata
    1907 – In corso
  11. 1883VEI 2Osservata
    1883 – In corso
  12. 1867VEI ?Stima geologica
    1867 – In corso
  13. 1865VEI ?Osservata
    1865 – In corso
  14. 1844 (±1 anni)VEI ?Stima geologica
    1844 – In corso
  15. 1827VEI 2Stima geologica
    1827 – 1838
  16. 1826VEI 3Osservata
    1826-06 – In corso
  17. 1818VEI ?Stima geologica
    1818 – In corso
  18. 1802VEI 3Osservata
    1802 – In corso
  19. 1792VEI ?Stima geologica
    1792-02-14 – In corso
  20. 1790VEI ?Stima geologica
    1790-06-07 – In corso
  21. 1768VEI 3Osservata
    1768 – 1769
  22. 1150 (±500 anni)VEI ?Stima geologica
    1150 – In corso
  23. 550 a.C. (±900 anni)VEI ?Stima geologica
    BCE 550 – In corso
  24. 1750 a.C.VEI ?Stima geologica
    BCE 1750 – In corso
  25. 3650 a.C. (±1850 anni)VEI 4Stima geologica
    BCE 3650 – In corso
  26. 6100 a.C. (±50 anni)VEI 5Stima geologica
    BCE 6100 – In corso
  27. 6650 a.C. (±200 anni)VEI ?Stima geologica
    BCE 6650 – In corso

Link esterni

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