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Alaska Volcano Observatory
Great Sitkin | Semisopochnoi | Shishaldin 
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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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Semisopochnoi
Color Code YELLOW / Alert Level ADVISORYvolcano image
Full details ...
Shishaldin
Color Code YELLOW / Alert Level ADVISORYvolcano image
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LAST ACTIVITY REPORT
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ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, May 31, 2020, 11:01 AM AKDT (Sunday, May 31, 2020, 19:01 UTC)


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

Unrest continues at Great Sitkin. Swarms of small earthquakes began ~17:30 AKDT on May 30 and continue intermittently today. No explosive activity was detected by regional infrasound sensors and cloudy conditions have obscured views of the volcano by satellite and web camera.

Great Sitkin volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote 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: ADVISORY
Current Aviation Color Code: YELLOW

Low-level unrest continues at Semisopochnoi. Seismicity remains above background with low-level tremor and occasional small earthquakes occurring over the past day. No explosive activity was detected by regional infrasound sensors and cloudy conditions have obscured views of the volcano by satellite.

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.


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

Low-level unrest continues at Shishaldin. Seismicity remains above background with low-level tremor and occasional small earthquakes occurring over the past day. No explosive activity was detected by regional infrasound sensors and cloudy conditions have obscured views of the volcano by satrellite and web camera.

Although unrest is currently at low levels, conditions could change rapidly with minimal warning, and eruptive activity in the summit crater could resume. If eruptive activity does resume, lava flows, lahars, and ash-producing events could occur.

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


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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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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