USGS Volcano Notice - DOI-USGS-AVO-2026-07-30T18:47:21+00:00

ALASKA VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Thursday, July 30, 2026, 11:05 AM AKDT (Thursday, July 30, 2026, 19:05 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 and typical steaming was observed in a high resolution satellite image. Web camera observations were obscured by clouds.

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: Earthquake activity and steam emissions continue.

Earthquake activity continues at a variable rate. Robust steaming and minor sulfur dioxide gas emissions were observed in satellite images from yesterday afternoon.

A new temporary monitoring station was installed recently near Mount Kupreanof and is providing seismic data 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: Volcanic unrest continues. An extensive steam plume was observed in satellite and web camera images over the past day, but does not indicate increased unrest.

Minor seismic activity and infrasound were detected at the volcano during the past day. Steam emissions were observed in satellite and web camera images over the past day, and produced an extensive visible plume. The plume was longer than what has been observed recently, but it does not indicate a significant change in unrest. Typical sulfur dioxide gas emissions were observed in satellite data from yesterday afternoon, extending more than 350 miles (560 km) towards the south..

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, UAFGI dfee1@alaska.edu (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.