A 481-meter landslide-tsunami in an Alaska fjord frequented by cruise ships
By
Michael E. West
Summary
A scientific report on the 10 August 2025 landslide in Tracy Arm fjord, Alaska, which triggered a massive tsunami with runup reaching 480 meters. The landslide, preconditioned by glacial retreat due to climate change, occurred early in the morning before tour cruise arrivals. Pre- and post-event seismic and satellite data revealed precursory microseismicity, global long-period waves, and a days-long standing wave in the fjord. The event highlights increasing risks from landslide-tsunamis as coastal glaciers retreat.
Source
bskyA 481-meter landslide-tsunami in an Alaska fjord frequented by cruise shipsscience.orgKey quotes
· 4 pulledShugar et al. report on the 10 August 2025 landslide in Tracy Arm fjord that caused a tsunami with runup as high as 480 meters.
The landslide-tsunami occurred early in the morning, before the arrival of tour cruises, which during the summer can include six vessels and thousands of passengers each day.
Pre- and postevent seismic and satellite data revealed precursory microseismicity, global long-period waves and a days-long, globally recorded standing wave in the fjord.
The landslide was preconditioned by glacial retreat caused by climate change.
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