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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).
Great Sitkin
View of Great Sitkin steaming, from Adak.
Pyre Peak
View of Pyre Peak on Seguam Island. Photograph courtesy of Brad Singer.
Cleveland Volcano seen from the western end of Tana Volcano. Photo taken during the 2015 field season of the Islands of Four Mountains multidisciplinary project, work funded by the National Science Foundation, the USGS/AVO, and the Keck Geology Consortium.
Aerial view of Isanotski Peaks on Unimak Island.
Moffett on a clear evening from the east, June 18, 2019.
Sunset view to the southwest silhouetting Roundtop, Isanotski, and Shishaldin volcanoes on Unimak Island in the eastern Aleutian Islands. Photograph by J. Davies, Geophysical Institute, University of Alaska Fairbanks, August, 1983.
Klawasi Group
Aerial view of Lower Klawasi mud volcano, located about 10 miles (16 km) east of Glennallen, Alaska
Jumbo Dome
Photograph of Jumbo Dome, a small volcanic dome northeast of Healy.
Recent avalanche on the east flank of Iliamna volcano, as seen from airplane.
Aerial view of young lava flows within the Caldera of Herbert Volcano.
The western tip of the Alaska Peninsula, as viewed from space. Dutton, partially obscured by clouds, is on the eastern part of the image, while Frosty is just left of center. This photograph is mission ISS014, Roll E, Frame 16657 from Image Science and Analysis Laboratory, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." and is available at http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS014&roll=E&frame=16657
Redoubt Volcano, August 9, 2019. Photo by Wyatt Mayo.
Okmok Caldera as viewed from an Alaska Airlines jet in early June, 2007. Okmok caldera is a nearly circular, 500- to 800-m-deep, 8- to 10-km-diameter collapse crater that truncates an older volcanic edifice. The current caldera formed about 2000 years ago. Since then, numerous eruptions from vents on the floor of the caldera have produced a variety of cones, craters, lava flows, and other volcanic features. As of October, 2009, Okmok last erupted in 2008 and is one of the most active volcanoes in the Aleutians.
Sugarloaf Peak
Semisopochnoi, view of Sugarloaf Head (in foreground) and Sugarloaf Peak (in background). Image courtesy of Ian L. Jones, Department of Biology, Memorial University.
Iron Trig cone
Scenic view of Iron Trig Cone. Photo courtesy of Wes Hildreth/USGS.
Shishaldin summit crater viewed from the northwest, August 15, 2018.
Incandescent lava flows down the flank of the intracaldera cinder cone at Veniaminof volcano on the Alaska Peninsula. Photograph by M.E. Yount, U.S. Geological Survey, October 7, 1983.
Mission: STS027 Roll: 37 Frame: 50 Mission ID on the Film or image: STS27 Country or Geographic Name: USA-ALASKA Features: STEPOVAK BAY Center Point Latitude: 56.0 Center Point Longitude: -159.5
At the summit of 2,135-m (7,005 ft)-high Mount Douglas volcano on the northeastern tip of the Alaska Peninsula is a warm and highly acidic crater lake approximately 160 m (525 ft) wide. Photograph by C. Neal, U.S. Geological Survey, June 4, 1990.
Hague, Mt
Summit lake at Hague.
Sarah Henton and Melissa Pfeffer collecting gas samples from the main pool at Shrub mud volcano. Temperature on this day was 44.1°C; about 5°C higher than in 2005. The gas is about 99% CO2.
Aerial view of Akutan volcano that forms the west part of Akutan Island in the eastern Aleutian Islands. The volcano's summit is truncated by a 2-km-wide (1.2 mi) caldera that contains a cinder cone that has been the site of frequent historical eruptions. View is to the southeast. Photograph by C. Nye, Alaska Division of Geological and Geophysical Surveys, May 10, 1994.
Crater Peak, a satellite vent, is located in a breach in the south wall of the ice-filled caldera of Mount Spurr volcano. It was the site of historical eruptions from Mount Spurr volcano in 1953 and 1992. Mount Spurr is the snow- and ice-covered peak on the skyline. View is to the north. Photograph by C. Neal, U.S. Geological Survey, June 3, 1993.
View of Kupreanof Volcano.
Gas Rocks, the
Aerial view of Gas Rocks. Photo courtesy of Wes Hildreth/USGS.

Get these reports emailed to you: USGS VNS

U.S. Geological Survey
Friday, December 4, 2020, 11:29 AM AKST (Friday, December 4, 2020, 20:29 UTC)

Note that Daily Updates will cease while there are no volcanoes in Alaska at elevated alert levels. A weekly update will continue to be issued each Friday.

52°22'54" N 174°9'55" W, Summit Elevation 5030 ft (1533 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

The Aviation Color Code and Alert Level was decreased to GREEN/NORMAL on December 3, 2020. Unrest that began in late October 2020 has subsided. Seismic activity is at background levels and satellite observations show no signs of activity. Steaming is not unusual at Korovin and meteorological conditions can enhance the visibility of these emissions.

Korovin is monitored by local seismic and infrasound sensors, satellite data, regional lightning detection instruments, and reports from local observers.

Korovin Volcano is a 1553-m-high (5030 ft) stratovolcano located on the northern part of Atka Island in the central Aleutian Islands, about 21 km (13 mi) north of the community of Atka, 538 km (350 mi) west of Dutch Harbor, and 1760 km (1100 mi) southwest of Anchorage. The volcano has two distinct summit vents about 0.6 km (2000 ft) apart, that have been the sites of eruptive activity in historical time. The most recently active of the vents maintains a small, roiling, lake that occasionally produces energetic steam emissions. Thermal springs and fumaroles located on and near the volcano indicate an active hydrothermal system. Korovin has erupted several times in the past 200 years, including 1973, 1987, and 1998, and has likely had small ash emissions as recently as 2005. Typical recent Korovin eruptions produce minor amounts of ash and occasional but small lava flows. Reports of the height of the ash plume produced by the 1998 eruption ranged from 4,900 to 10,600 m (16,000 to 35,000 feet) above sea level.


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

SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/

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

David Fee, Coordinating Scientist, UAFGI
dfee1@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: December 3, 2020 11:52
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This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

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