ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Monday, January 28, 2019, 12:33 PM AKST (Monday, January 28, 2019, 21:33 UTC)

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

Weakly elevated surface temperatures were observed at Cleveland in clear satellite images over the past 24 hours. A steam plume was reported yesterday afternoon. Recent satellite data suggests lava dome growth first observed in the summit crater on January 12 may have ended as early as January 16. Since then, observations show the center of the newly emplaced lava dome is slowly subsiding.

The most recent explosion of Cleveland occurred on January 9. Emplacement of a new lava dome since that explosion may increase the likelihood of explosive activity at the volcano. Most Cleveland explosions are 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 less likely and/or frequent.

The local seismic and infrasound data at Cleveland went offline on January 26, which restricts AVO's ability to rapidly detect an explosive eruption. AVO continues monitoring for signs of eruptive activity with regional instruments, satellite, and lightning data.

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

Weak to moderately elevated surface temperatures were observed in clear satellite images over the past 24 hours, consistent with cooling of lava emplaced in December. Seismic tremor, if still persisting, is at very low levels. Eruptive activity consisting of lava effusion and/or ash emissions could resume at any time without significant seismic precursors.

Veniaminof volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect changes in unrest that may lead to a more significant explosive eruption. AVO combines seismic, infrasound, lightning, and satellite data for rapid detection of such events.

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

No unusual activity was observed in seismic data or partly cloudy to cloudy satellite images over the past 24 hours. No explosive activity detected on a regional infrasound array on Adak Island.

Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allow 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.

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

Jessica Larsen, Acting Coordinating Scientist, UAFGI
jflarsen@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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