Study finds 2025 Alaska fjord tsunami was triggered by a landslide and ranked among the tallest recorded
The Facts
- A landslide in Tracy Arm fjord in southeast Alaska on Aug. 10, 2025, triggered a localized tsunami.
- Researchers estimated the wave reached about 1,578 feet, or 481 meters, making it the second-highest tsunami on record.
- The landslide involved about 64 million cubic meters of rock, described as roughly 24 times the volume of the Great Pyramid of Giza.
- The tsunami stripped vegetation from steep rock walls in the fjord, leaving visible damage along the landscape.
- Tracy Arm is a popular sightseeing and cruise destination, but no cruise ships or other boats were in the fjord when the tsunami struck early that morning, and reports said there were no injuries.
- The findings were published in the journal Science by an international research team that reconstructed the event using tools including seismic data, satellite observations and computer modeling.
- Scientists say glacier retreat can destabilize slopes and raise the risk of similar landslide-generated tsunamis in polar and subpolar fjords, creating potential hazards for nearby communities, tourism operators and vessels.
- Researchers say the Alaska event highlights the need for stronger monitoring and warning systems because similar hazards may become more common as glaciers continue to retreat.
How left and right are reading this
- Both agree
- A massive landslide-generated tsunami in a popular Alaska fjord exposed a real public-safety hazard that could become more common as glacier retreat destabilizes slopes, making stronger monitoring and warning systems an urgent practical need for communities, vessels and tourism operators.
- They split on
- Less a disagreement than a question of emphasis: the event as a climate-linked warning about growing danger in polar fjords, versus the same event as a straightforward case for better risk management in a heavily visited waterway.
Analytical frames for this storyTap to explore
Context
What caused the tsunami?
According to the study, a large mountainside collapse sent tens of millions of cubic meters of rock into Tracy Arm fjord in less than a minute, displacing water and generating the tsunami NYT,BBC.
Was anyone hurt?
The reports say no injuries were reported. Multiple outlets say the tsunami struck around 5:30 a.m., before cruise ships or other boats were in the fjord, even though the area is a popular tourist destination Terra,Independent,U.S. News & World R….
Why are scientists treating this as a broader warning?
Researchers say the event shows how retreating glaciers can leave steep slopes less supported and more prone to collapse, which can in turn generate tsunamis in fjords. They say that raises concerns for other glacier regions and supports calls for better hazard surveillance and warning systems NYT,SAPO,Conversation.
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Wire services (4)
ReutersSuperhits 97.9 Terre Haute, INHuge 2025 tsunami in Alaska fjord was second-highest on reco...
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