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Aniakchak volcan

Updated: 2 mars. 2024 07:10 GMT -
Caldera 1341 m / 4,400 ft
United States, Alaska Peninsula, 56.88°N / -158.17°W
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 1 nov. 2023 (Smithsonian / USGS Weekly Volcanic Activity Report)

Montrer carte interactive
Style éruptif tipique: unspecified
Eruptions du volcan Aniakchak: 1931 

Derniers séismes proches

HeureMag. / ProfondeurDistance/Lieu
23 févr. 14:55 (Anchorage)
23 févr.. 23:55 GMT

1.8

90 km
21 km au sud-est 47 km au sud-est de Port Heiden, Lake and Peninsula, Alaska, États-Unis Plus

Introduction

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.
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Smithsonian / GVP volcano information


See also: Sentinel hub | Landsat 8 | NASA FIRMS
Actualités
mer., 1 nov. 2023, 15:00

Aniakchak volcano (Alaska Peninsula, Alaska) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 October-31 October 2023 (Continuing Activity)

AVO reported that on 26 October strong winds in areas NW of Aniakchak and E of Port Heiden dispersed unconsolidated ash up to 0.9 km (3,000 ft) a.s.l. to the NW. The ash cloud was visible in satellite images and in Port Heiden webcam views. ... Read all
Actualités
mer., 1 nov. 2023, 15:00

Aniakchak volcano (Alaska Peninsula, Alaska) - Smithsonian / USGS Weekly Volcanic Activity Report for 25 October-31 October 2023 (Continuing Activity)

AVO reported that on 26 October strong winds in areas NW of Aniakchak and E of Port Heiden dispersed unconsolidated ash up to 0.9 km (3,000 ft) a.s.l. to the NW. The ash cloud was visible in satellite images and in Port Heiden webcam views. ... Read all
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