USGS Volcano Notice - DOI-USGS-AVO-2026-08-12T21:23:26+00:00 Search Search Hazard Notification System (HANS) for Volcanoes Home | VONAs | Volcano Notice Search | Resources USGS Volcano Notice - DOI-USGS-AVO-2026-08-12T21:23:26+00:00 Back ALASKA VOLCANO OBSERVATORY DAILY UPDATE U.S. Geological Survey Wednesday, August 12, 2026, 1:25 PM AKDT (Wednesday, August 12, 2026, 21:25 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. Slow eruption of lava within the summit crater continues. Minor earthquakes were detected over the past day, likely associated with rockfall on the growing dome. No activity was observed in cloudy satellite and webcam images over the past day. The current eruption began in July 2021. 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: Low-level seismic activity continued over the past day. Low-level earthquake activity continued over the past day. No activity was observed in cloudy satellite and webcam images. A new temporary monitoring station was installed recently near Mount Kupreanof and is providing seismic data, infrasound data, gas measurements, and web camera images on an intermittent basis. This is by design to conserve battery power, but the frequency of data acquisition can be increased if activity warrants. The closest functioning seismometers that provide continuous data are approximately 10 miles (16 km) to the northeast 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: Seismic and infrasound events continue Unrest continues with minor seismic and infrasound activity detected during the past day. No activity was observed in cloudy satellite and webcam images. Sulfur dioxide emissions were observed in satellite data. 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 [email protected] (907) 786-7497 David Fee, Coordinating Scientist, UAFGI, [email protected] (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. DOI Privacy Policy Legal Accessibility Site Map Contact USGS U.S. Department of the Interior DOI Inspector General White House No Fear Act FOIA Follow Twitter Facebook GitHub Flickr YouTube Instagram