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Yunaska volcano

Shield volcano 550 m / 1,804 ft
United States, Aleutian Islands, 52.64°N / -170.63°W
Current status: dormant (1 out of 5) | Reports
Yunaska volcano books
Typical eruption style: unspecified
Yunaska volcano eruptions: 1937 
TimeMag. / DepthDistanceLocation
Sat, 25 Aug
Sat, 25 Aug 16:50 UTCM 6.0 / 35.1 km72 km- 22km SSE of Amukta Island, Alaska

Background:

The elongated, 9 x 23 km island of Yunaska in the Islands of the Four Mountains group is comprised of two unnamed volcanic centers of greatly different morphology. The older, 950-m-high western center consists of the eroded remnants of four overlapping stratovolcanoes that form a linear, NNE-trending ridge. Cinder cones and fissure-fed lava flows extend from the western end of the complex. The younger, 550-m-high eastern complex consists of a shield volcano capped by two nested calderas. The 3.5-km-wide Coats caldera is located within an older 10 x 13 km caldera and contains cinder cones and a lava field. Two areas of particularly youthful lava flows extend down the flank through a gap in the SW caldera rim and blanket the upper northern flank of the caldera. Vents are found on the flanks of the caldera within a kilometer of its rim. A post-caldera cone is capped by a small summit crater. The eastern center is presumably the source of the island's historical eruptions, first recorded in 1817.
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Smithsonian / GVP volcano information


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