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Ukinrek Maars volcano

Maars 91 m / 299 ft
United States, Alaska Peninsula, 57.83°N / -156.51°W
Current status: dormant (1 out of 5) | Reports
Ukinrek Maars volcano books
Typical eruption style: unspecified
Ukinrek Maars volcano eruptions: 1977 
TimeMag. / DepthDistanceLocation
Wed, 1 Aug
Wed, 1 Aug 11:59 UTCM 2.1 / 9.6 km32 km- 93km SSE of King Salmon, Alaska

Background:

Ukinrek Maars are two explosion craters that were created in an area without previous volcanic activity during a 10-day-long phreatomagmatic eruption March-April 1977. The basaltic maars were erupted through glacial deposits in the Bering Sea lowlands 1.5 km south of Becharof Lake and 12 km west of Peulik volcano; their location is related to the regional Bruin Bay fault. The elliptical West Maar, which was the first to form, is 105 x 170 m wide and 35 m deep. The other maar, 600 m to the east, is 300 m wide and 70 m deep. Both maars are now filled by crater lakes; the eastern lake encircles a 49-m-high lava dome that was emplaced at the end of the eruption. Base surges were directed primarily to the NW. Juvenile material from the Ukinrek eruptions was of mantle-derived olivine basaltic composition. The dacitic Gas Rocks lava domes, of Quaternary age, are located on the shores of Becharof Lake, 3 km north of Ukinrek maars and were the site of a phreatic eruption about 2300 years ago.
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Smithsonian / GVP volcano information


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