The United States Geological Survey – Alaska Volcano Observatory (USGS-AVO) reported that unrest continued at Shishaldin between 21 September 2025 (local) and 22 September 2025 (local). The alert level remained at „Advisory“ (level 2 on a 4-level scale). The aviation alert level remained at „Yellow“ (level 2 on a 4-level scale).
Source: United States Geological Survey – Alaska Volcano Observatory (USGS-AVO)
Current Alerts:
Observatory alert level: „Advisory“ (level 2 on a 4-level scale)
Aviation Alert Level: „Yellow“ (level 2 on a 4-level scale)
Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Sep 22, 2025