Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Ukinrek Maars
Ukinrek Maars are two explosion craters that were created in an area without previous volcanic activity during a phreatomagmatic eruption March-April 1977. A greenish lake fills East Maar, the largest of the Ukinrek Maars in this 1994 view from the south. East Maar and the smaller West Maar, within the dark tephra blanket near the left margin, were formed during the 10-day-long eruption that began on March 30, 1977. Gas Rocks, an older glaciated volcanic center, forms the peninsula extending into Becharof Lake in the background. Photo by Chris Nye, 1994 (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory).
Volcano Number:312131
Volcano Name:Ukinrek Maars
Country:United States
Volcano Type:Maar(s)
Last Eruption:1977
Elevation:91m
Tectonic Setting:Subduction zone / Continental crust (> 25 km)
Pop. within 5km:0
Pop. within 10km:0
Pop. within 30km:0
Pop. within 100km:739
Latitude:57.832
Longitude:-156.51



Eruption Data from the Global Volcanism Program of the Smithsonian Institution
Volcano Number Volcano Name Eruption Number Activity Type Explosivity Index Max Explosivity Index Modifier Activity Area Activity Unit Start Evidence Method Start Date End Date
312131 Ukinrek Maars 20205 Confirmed Eruption Gas Rocks Radiocarbon (uncorrected) -350
312131 Ukinrek Maars 20206 Confirmed Eruption 3 West and East Ukinrek Maars Historical Observations 1977/3/30 1977/4/9
Emissions Data from the Global Volcanism Program of the Smithsonian Institution No emissions data found for this volcano.


Data from the Earthchem Portal
Sorry. No data exist for this volcano in the EarthChem Portal.


Data from the SESAR Database


Data from the MaGa Database
Location: Ukinrek Maars (View Details at MaGa DB)
Description: The Ukinrek Maars are two phreatomagmatic vents that formed on the north side of the Aleutian Range on a low area bordering the Bering Sea.Water began pooling in the craters soon after the eruption. CO2- rich gas bubbled up through hot (81 °C) saline water at the bottom of the western maar in late-August 1977, and in July 1979 both craters contained lakes with trains of gas bubbles visible from shore.
Hazard Description: not reported
Type: soil_diffuse_emission
Region: Alaska, USA
Country: United States
Volcanic Complex: Ukinrek Maars
Gas Flux Data:
Measurement Name Detail Specie Flux Std. Dev. Unit of Measure
Ukinrek Maars_21062004 Detail CO2 44 0 Mg/d

Location: Ukinrek Maars plume (View Details at MaGa DB)
Description: The Ukinrek Maars are two phreatomagmatic vents 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.
Hazard Description: There is no evidence of imminent hazard at the site.
Type: volcanic_plume
Region: Alaska, USA
Country: United States
Volcanic Complex: Ukinrek Maars
Gas Flux Data:
Measurement Name Detail Specie Flux Std. Dev. Unit of Measure
Ukinrek Maars_24051998 Detail H2S 146 0 Mg/d