United States · Stratovolcano
Makushin Volcano
Makushin
- Type
- Stratovolcano
- Elevation
- 1800m
- Last eruption
- 1995
- Type
- Stratovolcano
- Country
- United States
- Region
- North America / Aleutian Ridge Volcanic Arc
- Elevation
- 1800m
- Coordinates
- 53.891, -166.923
- Last eruption
- 1995
- Tectonic setting
- Subduction zone / Intermediate crust (15-25 km)
- Landform
- Composite
- Major rock type
- Andesite / Basaltic andesite
Geological summary
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.
From Wikipedia
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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Eruption history
27 recordedGlossaryDetailed timeline
- 1995VEI 1Observed1995-01-30 – 1995-01-30
- 1993VEI 1Observed1993-08-16 – 1994-01-19
- 1987VEI 1Observed1987-03-02 – 1987-03-02
- 1980VEI 1Observed1980-05-01 – 1980-07-04SE side of summit
- 1952VEI ?Method not stated1952-07-02 – end unknown
- 1951VEI 1Observed1951-12-20 – end unknown
- 1938VEI 2Observed1938-10-16 – end unknown
- 1926VEI 2Observed1926-12-30 – end unknown
- 1912VEI ?Method not stated1912-07-02 – end unknown
- 1907VEI ?Observed1907-07-02 – end unknown
- 1883VEI 2Observed1883-07-02 – end unknown
- 1867VEI ?Method not stated1867-07-02 – end unknown
- 1865VEI ?Observed1865-07-02 – end unknown
- 1844 (±1 yrs)VEI ?Method not stated1844-07-02 – end unknown
- 1827VEI 2Method not stated1827-07-02 – 1838-07-02
- 1826VEI 3Observed1826-06-16 – end unknown
- 1818VEI ?Method not stated1818-07-02 – end unknown
- 1802VEI 3Observed1802-07-02 – end unknown
- 1792VEI ?Method not stated1792-02-14 – end unknown
- 1790VEI ?Method not stated1790-06-07 – end unknown
- 1768VEI 3Observed1768 – 1769
- 1150 (±500 yrs)VEI ?Geological estimate1150 – end unknown
- 550 BCE (±900 yrs)VEI ?Geological estimate550 BCE – end unknown
- 1750 BCEVEI ?Geological estimate1750 BCE – end unknown
- 3650 BCE (±1850 yrs)VEI 4Geological estimate3650 BCE – end unknown
- 6100 BCE (±50 yrs)VEI 5Geological estimate6100 BCE – end unknown
- 6650 BCE (±200 yrs)VEI ?Geological estimate6650 BCE – end unknown
Nearby volcanoes
External links
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