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Alaska's 2025 mega tsunami highlights risk to cruise lines as glaciers retreat
Researchers say 481-metre wave in fjord was triggered by rockslide linked to climate crisis
TL;DR
- A 481-meter tsunami occurred in Alaska's Tracy Arm fjord on August 10, 2025, following a massive rockslide onto the South Sawyer glacier.
- The event, triggered by a 1km vertical collapse, produced a tsunami taller than the Eiffel Tower and is considered a near-miss for numerous cruise ships and vessels in the area.
- Scientists attribute the increased risk of such events to climate change, specifically glacier retreat and permafrost degradation, which destabilize slopes.
- The study highlights that landslide-generated tsunamis can have higher runups than earthquake tsunamis, particularly in confined bodies of water like fjords.
- Researchers urge for stronger risk mitigation, including slope monitoring, realistic tsunami modeling, and enhanced protection for communities and tourists.