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The Alaska Volcano Observatory (AVO) is a joint program of the U.S. Geological Survey (USGS), the Geophysical Institute of the University of Alaska Fairbanks (UAFGI), and the State of Alaska Division of Geological and Geophysical Surveys (ADGGS).
RESTLESS VOLCANOES
Cleveland
Color Code YELLOW / Alert Level ADVISORYvolcano image
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Semisopochnoi
Color Code ORANGE / Alert Level WATCHvolcano image
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Veniaminof
Color Code YELLOW / Alert Level ADVISORYvolcano image
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NEWS
90th Anniversary of the 1931 eruption of Aniakchak Volcano, Alaska
Posted: May 03, 2021
Aniakchak Volcano (also known as Aniakchak crater or caldera) on the Alaska Peninsula is one of the most spectacular volcanic centers in Alaska (and we dare say, the world!)


Aerial view, looking east, of Aniakchak caldera, M. Williams, 1977


For approximately 6 weeks in May and June of 1931, Aniakchak erupted intermittently in violent fashion, producing widely-felt earthquakes and concussive explosions, blanketing the surrounding region in ash, and reaming new craters within the caldera. Eruption of lava within these craters may have continued into early July.
To mark this anniversary, AVO geologists familiar with Aniakchak will present some interesting tidbits to tell the story of the eruption, its impacts, and other information about this fascinating volcano. What we know about the 1931 eruption comes from contemporary newspaper accounts, the writings and dramatic photographs of Father Bernard Hubbard (aka the “Glacier Priest”) of Santa Clara University, and geologic fieldwork by AVO volcanologists. Check out the many resources on our web page if you want to learn more: https://www.avo.alaska.edu/volcanoes/volcinfo.php?volcname=Aniakchak

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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Wednesday, May 5, 2021, 1:04 PM AKDT (Wednesday, May 5, 2021, 21:04 UTC)


SEMISOPOCHNOI VOLCANO (VNUM #311060)
51°55'44" N 179°35'52" E, Summit Elevation 2625 ft (800 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

No eruptive activity was observed at Semisopochnoi volcano in cloudy to partly cloudy satellite imagery or by regional infrasound arrays over the past 24 hours. A steam and gas plume was observed from the active north crater of Mount Cerberus. Small eruptions producing minor ash deposits near the volcano and ash clouds usually under 10,000 ft above sea level are typical of activity at this volcano.

Semisopochnoi is monitored by satellite data, regional infrasound, and lightning detection instruments. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.


VENIAMINOF VOLCANO (VNUM #312070)
56°11'52" N 159°23'35" W, Summit Elevation 8225 ft (2507 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

No significant activity was detected in seismic or infrasound data. Nothing observed in partly cloudy satellite and web camera data over the past day.

Eruptive activity at Veniaminof usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Ash emissions are typically confined to the summit crater, but larger events can result in ash fall in nearby communities and drifting airborne ash.

The partial restoration of local seismic data will help the Alaska Volcano Observatory to detect changes in unrest that may lead to a more significant explosive eruption. AVO combines seismic, infrasound, lightning, web camera, and satellite data for rapid detection of such events.


CLEVELAND VOLCANO (VNUM #311240)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Small local earthquakes were detected in seismic data over the past day. No volcanic activity was observed in mostly cloudy satellite views.

Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently.

When operational, Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to precisely locate earthquakes and detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data.


OTHER ALASKA VOLCANOES

Information on all Alaska volcanoes is available at : http://www.avo.alaska.edu.

For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://www.avo.alaska.edu/color_codes.php

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CONTACT INFORMATION:

Matt Haney, Acting Scientist-in-Charge, USGS
mhaney@usgs.gov (907) 786-7497

Ronni Grapenthin, Acting Coordinating Scientist, UAF
rgrapenthin@alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.
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Page modified: March 26, 2021 13:42
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