AVO/USGS Volcanic Activity Notice

Volcano: Iliamna (VNUM #313020)

Current Volcano Alert Level: NORMAL
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: GREEN
Previous Aviation Color Code: YELLOW

Issued: Monday, June 5, 2023, 7:43 PM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2023/A816
Location: N 60 deg 1 min W 153 deg 5 min
Elevation: 10016 ft (3053 m)
Area: Cook Inlet-South Central

Volcanic Activity Summary:

Previously reported earthquake activity culminated in an ice-rock avalanche slightly before 5:14 pm AKDT this evening (1:14 June 6, 2023 UTC). Although we lack visual confirmation at this time, the seismic signals recorded match historic observations of avalanches associated with Red Glacier on Iliamna Volcano’s eastern flank. Seismicity has since declined to background levels. The Aviation Color Code and Volcano Alert Level is therefore being lowered to GREEN and NORMAL.

Recent Observations:
[Volcanic cloud height] NA
[Other volcanic cloud information] Unknown


Iliamna Volcano is located on the western side of lower Cook Inlet in the Lake Clark National Park. Iliamna is a snow-covered stratovolcano which rises 10,020 feet above sea level. Although steam plumes occur on its eastern flanks, there has been no historic volcanic activity at Iliamna. Iliamna is located 225 km (140 miles) southwest of Anchorage and 113 km (70 miles) southwest of Homer.


Aaron Wech, Acting Scientist-in-Charge, USGS (907) 786-7497

David Fee, Coordinating Scientist, UAFGI (907) 378-5460

Next Notice:

A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at

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