Ukinrek Maars volcano

Maars 91 m / 299 ft
United States, Alaska Peninsula, 57.83°N / -156.51°W
Current status: normal or dormant (1 out of 5)

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Typical eruption style: unspecified
Ukinrek Maars volcano eruptions: 1977 

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Mon, 21 Jun 2021 (GMT) (2 earthquakes)
21 Jun 2021 07:03:38 GMT
1.3

17 km		44 km (27 mi)
83 Km WNW of Karluk, Alaska
21 Jun 2021 00:02:15 GMT
1.2

18 km		39 km (24 mi)
Alaska Peninsula
Sun, 20 Jun 2021 (GMT) (1 earthquake)
20 Jun 2021 21:24:26 GMT
1.7

13 km		37 km (23 mi)
91 Km ESE of Egegik, Alaska
Fri, 11 Jun 2021 (GMT) (2 earthquakes)
11 Jun 2021 06:52:58 GMT
1.5

3.2 km		41 km (25 mi)
68 Km SW of Karluk, Alaska
11 Jun 2021 04:16:26 GMT
1.8

17 km		40 km (25 mi)
88 Km WNW of Karluk, 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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