ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Tuesday, May 26, 2026, 12:11 PM AKDT (Tuesday, May 26, 2026, 20:11 UTC)
GREAT SITKIN (VNUM #311120)
52°4'35" N 176°6'39" W, Summit Elevation 5709 ft (1740 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Summary: Slow eruption of lava within the summit crater continues.
The volcano exhibited no significant seismic activity during the past day. Persistent cloud cover prevented clear satellite and webcam observations of the volcano.
The current eruption began in July 2021 and, since then, lava flows have filled most of the summit crater and advanced into valleys below. There have been no explosions at Great Sitkin Volcano since an event in May 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data, webcams, and regional infrasound and lightning networks.
To view monitoring data and other information about Great Sitkin Volcano: https://avo.alaska.edu/volcano/great-sitkin
KUPREANOF (VNUM #312060)
56°45" N 159°47'28" W, Summit Elevation 6217 ft (1895 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Summary: Unrest continues with no earthquakes detected.
The volcano was seismically quiet over the past day. Clouds obscured all satellite images.
There is no real-time geophysical monitoring network at Mount Kupreanof. The closest functioning seismometers are approximately 17 miles (27 km) to the east of the volcano as part of the Mount Veniaminof network. Mount Kupreanof is also monitored by satellite data, remote infrasound and lightning networks, and visual observations from pilots and mariners passing by the volcano.
To view monitoring data and other information about Mount Kupreanof: https://avo.alaska.edu/volcano/kupreanof
SHISHALDIN (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
Summary: Ongoing volcanic unrest is indicated by seismic activity, infrasound events, and sulfur dioxide (SO2) gas emissions.
Minor seismic activity and infrasound were detected at the volcano. Sulfur dioxide emissions were identified in satellite imagery.
Local seismic and infrasound sensors, web cameras, and a geodetic network are used to monitor Shishaldin Volcano. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lightning data, and satellite images to detect eruptions.
To view monitoring data and other information about Shishaldin Volcano: https://avo.alaska.edu/volcano/shishaldin
CONTACT INFORMATION:
Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497
David Fee, Coordinating Scientist, dfee1@alaska.edu UAFGI (907) 378-5460
Contact AVO: https://avo.alaska.edu/contact
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.
Hazard Notification System (HANS) for Volcanoes at volcanoes.usgs.gov/hans2/