Ukinrek Maars Volcano
Updated: Mar 26, 2025 09:22 GMT - 60 minutes ago refresh
Maars
United States, Alaska Peninsula, 57.83°N / -156.51°W 
+Local time: 2:22:17 am | Wed 26, Mar (America/Anchorage GMT -8)
Light freezing rain -4.7°C / 23.5°F
Sunrise: 08:13 am
Sunset: 08:59 pm
Moonrise: 07:55 am
Moonset: 05:14 pm
Weather Outlook
Kanatak, United States of America
-4.7°C / 24°F
Light freezing rain
Wind: 9.4 km/h
Precipitation: 0.01 mm
Pressure: 1024 mb
Humidity: 91 %
Wed
-3.4°C26°F
Thu
-3.2°C26°F
Fri
-4.4°C24°F
Summit height: 91 m / 299 ft
Current status: normal or dormant (1 out of 5)
Last update: 22 Dec 2021 (Smithsonian / USGS Weekly Volcanic Activity Report)
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Ukinrek Maars volcano eruptions: 1977
Latest nearby earthquakes
| Date and Time | Mag / Depth | Distance / Location | |||
|---|---|---|---|---|---|
| Mar 20, 06:39 am (Universal Time) 6 days ago | 0.6 8.4 km | 3.2 km (2 mi) to the N | 65 km SE of Egegik, Alaska | Info | |
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.---
Smithsonian / GVP volcano information
Significant volcanic eruptions: Ukinrek Maars volcano
In the past 10,000 years, Ukinrek Maars has had only one confirmed historic eruption in 1977 and one in 350 BC inferred from geological evidence.
The table below lists all known eruptions (date in bold face) of Ukinrek Maars volcano in historic times and during the past 10,000 years. Updates on the most recent volcanic activity of Ukinrek Maars can be found on the news page of Ukinrek Maars volcano.
| Date | Note | VEI | Deaths | Damage | |
|---|---|---|---|---|---|
| West and East Ukinrek Maars Historical obs./docs. | 3 | ||||
| Gas Rocks | ? | ||||
Remark:
Our list of volcanic eruptions closely follows the database of eruptions of the Smithsonian's Global Volcanism Project (GVP), the internationally most recognized data source for volcanic eruptions, but also includes significant eruptive episodes or related volcano events. "Volcanic eruptions" are usually to be understood as sequences of individual eruptive episodes that can follow each other, or even overlap (if several vents are involved), and can last many years, decades or even longer. For example, the current activity of Stromboli volcano is understood as a single eruption that has been ongoing since 1934.
Sources: NOAA National Centers for Environmental Information (NCEI), Global Significant Volcanic Eruptions Database. doi:10.7289/V5TD9V7K | Global Volcanism Project / Smithsonian Institution
Ukinrek Maars Volcano FAQ
+When was the last eruption of Ukinrek Maars volcano?
The last confirmed eruption of Ukinrek Maars occurred in 1977.
+How often does Ukinrek Maars volcano erupt?
There are no known historic eruptions, but evidence from geologic records shows that it has had at least 2 eruptions over the past 10,000 years. This number is likely much higher because many past eruptions might not have left evidence recognizeable today and/or the volcano might not have been studied in too much detail. Using the available data, a very conservative estimate is that Ukinrek Maars volcano erupts every 5,000 years.
+How active is Ukinrek Maars volcano at present?
Ukinrek Maars volcano is occasionally active: Since 1900, it has had one eruption, which occurred in 1977.
+When was the largest eruption of Ukinrek Maars volcano?
The largest eruption of Ukinrek Maars volcano in historic times occurred in 1977. It ranks as a "vulcanian" eruption with a magnitude 3 on the VEI (Volcanic Explosivity Index) scale.
Latest satellite images
Ukinrek Maars Volcano Maps
Below is a selection of maps showing the location and surroundings of the volcano at various resolutions based on aerial-imagery / terrain maps. Feel free to use them for non-commercial purposes on your blog or website as long as you credit them with a link back to this page (click to copy it).
Satellite/aerial-type map of Ukinrek Maars volcano (world scale)
Terrain-type map of Ukinrek Maars volcano (world scale)
Satellite/aerial-type map of Ukinrek Maars volcano (region scale large)
Terrain-type map of Ukinrek Maars volcano (region scale large)
Satellite/aerial-type map of Ukinrek Maars volcano (region scale medium)
Terrain-type map of Ukinrek Maars volcano (region scale medium)
Satellite/aerial-type map of Ukinrek Maars volcano (region scale small)
Terrain-type map of Ukinrek Maars volcano (region scale small)
Satellite/aerial-type map of Ukinrek Maars volcano (local scale large)
Terrain-type map of Ukinrek Maars volcano (local scale large)
Satellite/aerial-type map of Ukinrek Maars volcano (local scale medium)
Terrain-type map of Ukinrek Maars volcano (local scale medium)
Satellite/aerial-type map of Ukinrek Maars volcano (local scale small)
Terrain-type map of Ukinrek Maars volcano (local scale small)
Satellite/aerial-type map of Ukinrek Maars volcano (scale of 10s of km)
Terrain-type map of Ukinrek Maars volcano (scale of 10s of km)
Satellite/aerial-type map of Ukinrek Maars volcano (scale of 20-40 km)
Terrain-type map of Ukinrek Maars volcano (scale of 20-40 km)
Satellite/aerial-type map of Ukinrek Maars volcano (scale of approx. 10-20 km)
Terrain-type map of Ukinrek Maars volcano (scale of approx. 10-20 km)
Satellite/aerial-type map of Ukinrek Maars volcano (scale of 5-10 km)
Satellite/aerial-type map of Ukinrek Maars volcano (scale of few kilometers)
