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Ukinrek maars

Ukinrek Maars

Maar · United States · 91 m

Ukinrek Maars are two phreatomagmatic explosion craters that were created in an area without previous volcanic activity during a 10-day-long eruption that began on 30 March 1977. A greenish lake fills East Maar, the largest of the two in this 1994 view from the south. The smaller West Maar is surrounded by dark tephra near the left margin. Gas Rocks, an older volcanic center, forms the peninsula extending into Becharof Lake in the background.
Ukinrek Maars are two phreatomagmatic explosion craters that were created in an area without previous volcanic activity during a 10-day-long eruption that began on 30 March 1977. A greenish lake fills East Maar, the largest of the two in this 1994 view from the south. The smaller West Maar is surrounded by dark tephra near the left margin. Gas Rocks, an older volcanic center, forms the peninsula extending into Becharof Lake in the background. · Foto: Photo by Chris Nye, 1994 (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory). · Wikimedia Commons
Tipo
Maar
País
United States
Región
North America Volcanic Regions / Alaska Peninsula Volcanic Arc
Altitud
91 m
Coordenadas
57.834, -156.520
Última erupción
1977
Contexto tectónico
Subduction zone / Continental crust (> 25 km)
Forma volcánica
Minor (Basaltic)
Roca principal
Basalt / Picro-Basalt
Resumen geológico

Ukinrek Maars are two explosion craters that were created in an area without previous volcanic activity during a 10-day phreatomagmatic eruption March-April 1977. The basaltic maars were erupted through glacial deposits in the Bering Sea lowlands 1.5 km S of Becharof Lake and 12 km W 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 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 N of Ukinrek maars and were the site of a phreatic eruption about 2,300 years ago.

Resumen de Wikipedia

Resumen en inglés

The Ukinrek maars 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.

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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
350 BCE~156 BCE · 1 erupciones · VEI máx. ?1783~1977 · 1 erupciones · VEI máx. 3350 BCE23281412011783

Línea de tiempo detallada

  1. 1977VEI 3Observado
    1977-03-30 – 1977-04-09
    West and East Ukinrek Maars
  2. 350 a. C.VEI ?Estimación geológica
    BCE 350 – En curso
    Gas Rocks

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.