Ukinrek maars
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The Ukinrek maars (Template:Langx<ref name=Kienle>Template:Cite journal</ref>) are two volcanic craters on the north side of the Aleutian Range in Alaska that were formed by a phreatomagmatic eruption in 1977. The maars are 1.5 km south of Becharof Lake and 12 km northwest of Peulik Volcano, on a low area of the range, bordering the Bering Sea. The western of the two is elliptical in shape and up to 170 m in diameter and 35 m deep. The other lies 600 m to the east and is circular and up to 300 m in diameter and 70 m deep. The east maar has a 49 m-high lava dome within its crater lake.<ref name=Miller>Miller, T.P., et al., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report 98-0582, 104 p</ref>
The eruption occurred in March–April 1977 and lasted for ten days. There was no previous eruption. The magmatic material was olivine basalt from a mantle source. Pyroclastic surge from the eruptions traveled to the northwest.<ref name=GVP/> The volume of lava erupted was 9×105 m3 and the volume of tephra expelled was 2.6×107 m3.<ref>Template:Cite gvp</ref> They were named shortly after the eruptions and the literal translation means "Two Holes".<ref name =Kienle></ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
The Quaternary age Gas Rocks dacite domes some three km to the northeast were the site of a phreatic eruption some 2300 years ago.<ref name=GVP>Template:Cite gvp</ref>
