Alaska Fjord Landslide Triggers Tsunami After Glacier Retreat
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A massive landslide in Tracy Arm Fjord, Alaska, triggered a tsunami after the rapid retreat of the South Sawyer Glacier in August 2025. The event stripped vegetation up to 1,578 feet high and created seismic signals equivalent to a magnitude 5.4 earthquake, but no injuries were reported. Researchers have now published an analysis detailing the event's impact.
Facts First
- A landslide of at least 64 million cubic meters of rock occurred in Tracy Arm Fjord on August 10, 2025.
- The landslide induced a tsunami that stripped trees from the fjord wall up to 1,578 feet above sea level.
- The event followed rapid retreat of the South Sawyer Glacier in summer 2025, captured by NASA-USGS Landsat satellites.
- Seismic signals were equivalent to a magnitude 5.4 earthquake and water sloshed in the fjord for more than a day.
- Kayakers' gear was swept away and a cruise vessel reported strong currents, but no injuries occurred.
What Happened
A landslide of at least 64 million cubic meters of rock slid downslope in Tracy Arm Fjord on the morning of August 10, 2025. The landslide followed the rapid retreat of the South Sawyer Glacier and broke off a large portion of its terminus, creating a slurry of icebergs. The landslide induced a tsunami that stripped trees and vegetation from the opposing fjord wall up to 1,578 feet (481 meters) above sea level. Kayakers camping on Harbor Island near the fjord's mouth had their gear swept away, and passengers on a small cruise vessel in neighboring Endicott Arm reported strong currents and swings in water levels. No injuries were reported.
Why this Matters to You
If you are planning a trip to Alaska's fjords, this event highlights a potential, though rare, natural hazard linked to glacial retreat. The safety of kayakers and cruise passengers could be affected by similar events in other fjords experiencing rapid glacier loss. The research published on May 6, 2026, may lead to improved monitoring and hazard assessments for these areas, which could enhance safety protocols for future visitors.
What's Next
The published analysis by Dan Shugar and colleagues provides a detailed scientific record of the event. This research could inform future hazard modeling for other fjords in Alaska and around the world that are experiencing similar glacial retreat. Monitoring by satellites like Landsat may continue to track glacier changes, which could help scientists identify areas with increased landslide risk.