Aniakchak vulcano
Aggiornato: 3 feb. 2023 06:18 GMT -
Caldera 1341 m / 4,400 ft
United States, Alaska Peninsula, 56.88°N / -158.17°W
Stato attuale: normal or dormant (1 di 5)
United States, Alaska Peninsula, 56.88°N / -158.17°W
Stato attuale: normal or dormant (1 di 5)
Last update: 6 lug 2022 (Smithsonian / USGS Weekly Volcanic Activity Report)
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Eruzioni del vulcano Aniakchak: 1931
Latest nearby earthquakes
| Data / ora | Mag. / Prof. | Distanza/Ubicazione | ||
| mercoledì, 1 febbraio 2023 GMT (3 sismi) | ||||
| 1 feb 2023 10:07 (GMT -9) (1 feb 2023 19:07 GMT) | 1.1 4.1 km | 2 km (1.2 mi) 29 Km ESE of Port Heiden, Alaska | ||
| 1 feb 2023 03:46 (GMT -9) (1 feb 2023 12:46 GMT) | 2.0 2.1 km | 32 km (20 mi) 59 km a est da Port Heiden, Borough di Lake and Peninsula, Alaska, Stati Uniti | ||
| 31 gen 2023 22:17 (GMT -9) (1 feb 2023 07:17 GMT) | 1.3 17 km | 20 km (12 mi) 49 Km ESE of Port Heiden, Alaska | ||
| martedì, 31 gennaio 2023 GMT (1 sismo) | ||||
| 31 gen 2023 02:39 (GMT -9) (31 gen 2023 11:39 GMT) | 0.9 4.8 km | 7.6 km (4.7 mi) 34 Km E of Port Heiden, Alaska | ||
| venerdì, 20 gennaio 2023 GMT (1 sismo) | ||||
| 20 gen 2023 00:26 (GMT -9) (20 gen 2023 09:26 GMT) | 1.7 5.9 km | 0.6 km (0.4 mi) 29 Km ESE of Port Heiden, Alaska | ||
Sfondo
One of the most dramatic calderas of the Aleutian arc, the 10-km-wide Aniakchak caldera was formed around 3400 years ago during a voluminous eruption in which pyroclastic flows traveled more than 50 km north to the Bering Sea and also reached the Pacific Ocean to the south. At least 40 explosive eruptions have been documented from Aniakchak during the past 10,000 years, making it the most active volcano of the eastern Aleutian arc. A dominantly andesitic pre-caldera volcano was constructed above basement Mesozoic and Tertiary sedimentary rocks that are exposed in the caldera walls to elevations of about 610 m. The ice-free caldera floor contains many pyroclastic cones, tuff cones, maars, and lava domes. Surprise Lake on the NE side drains through The Gates, a steep-walled breach on the east side of the 1-km-high caldera rim. Vent Mountain and Half Cone are two long-lived vents on the south-central and NW caldera floor, respectively. The first and only confirmed historical eruption took place in 1931 from vents on the west and SW caldera floor.---
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8 | NASA FIRMS
