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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)
Ukinrek Maars volcano books
Typical eruption style: unspecified
Ukinrek Maars volcano eruptions: 1977 
TimeMag. / DepthDistanceLocation
Mon, 17 Apr
Mon, 17 Apr 21:09 UTCM 1.1 / 11.7 km30 km- 94km SSE of King Salmon, Alaska
Thu, 30 Mar
Thu, 30 Mar 11:40 UTCM 1.7 / 123.6 km22 km- 84km SSE of King Salmon, Alaska
Fri, 24 Mar
Fri, 24 Mar 03:46 UTCM 2.3 / 130.4 km20 km- 86km SSE of King Salmon, Alaska
Wed, 22 Mar
Wed, 22 Mar 18:20 UTCM 3.6 / 125 km18 km ALASKA PENINSULA
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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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