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Makushin Volcano

Makushin

Stratovolkan · 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
Tipe
Stratovolkan
Negara
United States
Wilayah
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Ketinggian
1800 m
Koordinat
53.891, -166.923
Letusan terakhir
1995
Kondisi tektonik
Subduction zone / Intermediate crust (15-25 km)
Bentuk lahan
Composite
Batuan utama
Andesite / Basaltic Andesite
Ringkasan geologi

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.

Ringkasan Wikipedia

Ringkasan Inggris

The Makushin Volcano is an ice-covered stratovolcano located on Unalaska Island in the Aleutian Islands of the U.S. state of Alaska. With an elevation of 2,036 meters (6,680 ft), its summit is the highest point on the island. Makushin is one of the most active among the 52 historically active volcanoes of Alaska. It has erupted at least two dozen times over the past several thousand years, with the last eruption occurring in 1995.

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Riwayat letusan

Ringkasan (VEI dari waktu ke waktu)
Klik pada bar untuk melihat letusan individu
6650 BCE~6362 BCE · 1 letusan · VEI maks. ?6362 BCE~6074 BCE · 1 letusan · VEI maks. 53768 BCE~3480 BCE · 1 letusan · VEI maks. 41751 BCE~1463 BCE · 1 letusan · VEI maks. ?598 BCE~310 BCE · 1 letusan · VEI maks. ?1131~1419 · 1 letusan · VEI maks. ?1707~1995 · 21 letusan · VEI maks. 36650 BCE4633 BCE2327 BCE310 BCE1707

Garis waktu rinci

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

Tautan eksternal

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