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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
Great Sitkin
Color Code YELLOW / Alert Level ADVISORYvolcano image
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Cleveland
Color Code YELLOW / Alert Level ADVISORYvolcano image
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Semisopochnoi
Color Code ORANGE / Alert Level WATCHvolcano image
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Shishaldin
Color Code ORANGE / Alert Level WATCHvolcano image
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NEWS
Update on AVO Operations during COVID-19
Posted: March 25, 2020
The Alaska Volcano Observatory continues to monitor Alaska volcanoes and issue forecasts and regular updates of volcanic activity. Our priority is to continue to accomplish our mission while also maintaining the health and safety of our employees and community, which are our highest priorities. We continue to follow guidance from the White House, the CDC, and State and local authorities as we implement teleworking, social distancing and virtual meeting tools. 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 & Geophysical Surveys. Guidance from these parent agencies varies slightly, but in general we have shifted our operations to a mostly virtual mode and have minimal staffing within our offices.

At this time, travel and field work to maintain our physical monitoring networks on Alaska volcanoes has been postponed until June, and we will be reconsidering our field work schedule as the COVID-19 situation evolves. When it does occur, all work will follow State and Federal government guidelines to ensure public safety and the safety of our staff.

If you need additional assistance, please contact https://avo.alaska.edu/contact.php

LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Saturday, March 28, 2020, 11:05 AM AKDT (Saturday, March 28, 2020, 19:05 UTC)


SHISHALDIN VOLCANO (VNUM #311360)
54°45'19" N 163°58'16" W, Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Unrest continues at Shishaldin. Seismicity remains elevated with continuous low-level tremor. Clear webcam and satellite views yesterday showed a small gas plume emanating from the summit of the volcano. Eruptive activity appears confined to the summit area during this most recent period of unrest, which started mid-March. Activity could increase with little or no warning, however, resulting in lava flows outside of the crater, lahars, and ash emissions.

Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a telemetered geodetic network, and distant infrasound and lightning networks.


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

Seismicity remains elevated at Semisopochnoi. No activity was seen in satellite views, which were cloudy over the past day.

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


GREAT SITKIN VOLCANO (VNUM #311120)
52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Small local earthquakes continued to occur at Great Sitkin over the past day. No significant activity was observed in satellite and web camera views, which were mostly obscured by clouds.

Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allows AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data.


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

No significant seismicity was recorded at Cleveland volcano. A weak summit gas plume was visible in webcam and satellite views yesterday, indicating continued unrest.

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.

Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to 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

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

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FOLLOW AVO ON TWITTER: https://twitter.com/alaska_avo

CONTACT INFORMATION:

Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@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: February 21, 2020 14:16
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