USGS Volcano Notice - DOI-USGS-AVO-2025-06-15T17:13:29+00:00

ALASKA VOLCANO OBSERVATORY INFORMATION STATEMENT
U.S. Geological Survey
Sunday, June 15, 2025, 10:19 AM AKDT (Sunday, June 15, 2025, 18:19 UTC)

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

An increase in seismicity, marked by frequent small earthquakes, has been observed at Iliamna Volcano beginning at about 4:30 am AKDT (12:30 UTC), June 15, 2025. This activity is likely not caused by volcanic unrest. Initially, the earthquake rate was nearly continuous, with several earthquakes per minute, but this has since slowed to a rate of about one earthquake per minute. The seismic activity resembles that previously observed preceding large ice and rock avalanches at the volcano, although the outcome of the current activity remains uncertain. Large ice and rock avalanches at Iliamna Volcano in the past have often occurred around this time of year.

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

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.