Alaska Volcano Observatory

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Saturday, August 8, 2026, 11:03 AM AKDT (Saturday, August 8, 2026, 19:03 UTC)

ILIAMNA (VNUM #313020)
60°1'55" N 153°5'30" W, Summit Elevation 10016 ft (3053 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Summary: An avalanche signal observed in seismic and pressure sensor data. No volcanic activity.

AVO detected seismic and pressure sensor signals associated with a large avalanche on the eastern flank of Iliamna Volcano this morning at 7:57 am AKDT (15:57 UTC). Avalanche events are somewhat common at this volcano.  Avalanches of similar seismic duration and amplitude occurred previously on May 22, 2016, June 21, 2019 and June 6, 2023.  The seismic signals from the avalanche were observed on monitoring networks throughout the Cook Inlet and as distant as the Katmai region 250 km (155 miles) away. We have not received any visual observations of the slide location or extent. The avalanche is not considered to be indicative of volcanic unrest.  

Iliamna volcano is located on the western side of lower Cook Inlet in Lake Clark National Park. It is a snow-covered stratovolcano which rises 3046 meters (9,993 feet) above sea level. Although steam plumes occur on its eastern flanks, there has been no historical volcanic activity at Iliamna. Iliamna is located 215 kilometers (130 miles) southwest of Anchorage and 100 kilometers (60 miles) northwest of Homer.

CONTACT INFORMATION:

Matt Haney, Scientist-in-Charge, USGS mhaney@usgs.gov (907) 786-7497

Ronni Grapenthin, Acting Coordinating Scientist, UAFGI, rgrapenthin@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.