Chuginadak (left) and Carlisle (right) islands, active volcanoes, as seen from the Office of Naval Research’s Research Vessel Atlantis during the 2025 Atlantic Arc expedition. The majority of Alaska’s 52 active volcanoes are in the Aleutian arc, including volcanoes that may be capable of producing dangerous tsunamis.
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Great Sitkin Island
Great Sitkin Island, an active volcano seen from the deck of the Office of Naval Research’s Research Vessel Atlantis during the 2025 Aleutian Arc expedition.
Credit

The Aleutian Arc: Integrated Exploration of Biodiversity at Priority Benthic Habitats (USGS/BOEM/NOAA/ONR). Photographer: Art Howard.

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Related Expedition
The Aleutian Arc: Integrated Exploration of Biodiversity at Priority Benthic Habitats