The Ukinrek maars (Central Yupik: Ukinrek[2]) are two volcanic craters on the north side of the Aleutian Range in Alaska that were formed by a phreatomagmatic eruption in 1977.

Information Contacts: Alaska Volcano Observatory (AVO)

Dec 22, 2021 · 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.

Description From Miller and others (1998) [1] : "Ukinrek Maars are a pair of phreatomagmatic explosion vents that formed on a low (less than 100 m high), 4-km-long, ridge in the Bering Sea Lowland 1.5 km south of Becharof Lake and 12 km northwest of Peulik Volcano.

The Ukinrek Maars erupted 30 March to 9 April 1977, forming two maars, a line of small pit craters and a tephra blanket extending to ~2 km from the vents. We combine photographic and written observations with stratigraphic analysis to reconstruct the eruption.

In the US there are numerous maar areas, such as in Alaska (Ukinrek maars, Nunivak in the Bering Sea); in Washington (Battle Ground Lake); in Oregon (Fort Rock basin with the maars of Big Hole, Hole-in-the-Ground, Table Rock); in Death Valley National Park, California (Ubehebe Crater); in Nevada (Soda Lakes); as well as the maars of the White ...

What is a maar? How do they form from phreatic eruptions? A maar is a volcanic crater that forms when magma contacts groundwater to produce a steam explosion. Ukinrek Maar: Views of East Ukinrek Maar Crater, which formed in April, 1977 during a 10-day eruption.

Feb 1, 1980 · During ten days of phreatomagmatic activity in early April 1977, two maars formed 13 km behind the Aleutian arc near Peulik volcano on the Alaska Peninsula. They have been named “Ukinrek Maars”, meaning “two holes in the ground” in Yupik Eskimo.

Ukinrek Maars is a volcanic crater and two maars located in Pilot Point, Alaska. It is with historical eruption and earthquake swarm.

Feb 1, 1980 · Schematic drawing of the setting of Ukinrek Maars showing the proposed basalt dike, the evacuated feeder under West Maar -- leading to collapse along arcuate fractures, the dike feeding the lava flow in East Maar and the position of the permeable pumice deposits.