Ukinrek Maars vulcano
Aggiornato: 2 feb. 2023 10:47 GMT -
Maars 91 m / 299 ft
United States, Alaska Peninsula, 57.83°N / -156.51°W
Stato attuale: normal or dormant (1 di 5)
United States, Alaska Peninsula, 57.83°N / -156.51°W
Stato attuale: normal or dormant (1 di 5)
Last update: 22 dic 2021 (Smithsonian / USGS Weekly Volcanic Activity Report)
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Eruzioni del vulcano Ukinrek Maars: 1977
Latest nearby earthquakes
| Data / ora | Mag. / Prof. | Distanza/Ubicazione | ||
| venerdì, 27 gennaio 2023 GMT (1 sismo) | ||||
| 26 gen 2023 17:53 (GMT -9) (27 gen 2023 02:53 GMT) | 1.7 14 km | 28 km (17 mi) 50 Km E of Ugashik, Alaska | ||
Sfondo
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
See also: Sentinel hub | Landsat 8 | NASA FIRMS
