Massive Landslide Triggers 500-Meter Tsunami in Alaska's Tracy Arm Fjord
Massive Landslide Triggers 500-Meter Tsunami in Alaska's Tracy Arm Fjord
US · Published May 11, 2026
On August 10, 2025, a colossal landslide occurred in Alaska's Tracy Arm fjord, releasing 63.5 million cubic meters of rock into the water near the South Sawyer Glacier.
The impact generated a tsunami with an initial wave height of 100 meters, which surged across the fjord at speeds exceeding 70 meters per second.
Upon reaching the opposite shoreline, the wave climbed to an astonishing height of 481 meters above sea level, making it the second-highest tsunami ever recorded globally.

Why It's Important?

The Tracy Arm fjord tsunami serves as a stark reminder of the dangers posed by landslide-generated tsunamis, which can produce localized but highly destructive waves. While no injuries or fatalities were reported in this instance, the event underscores the vulnerability of tourist areas and communities near retreating glaciers. The rapid displacement of water in confined fjords can lead to extreme wave heights, posing risks to infrastructure, vessels, and human life. As glaciers continue to retreat due to warming temperatures, the likelihood of similar events increases, necessitating improved monitoring and preparedness in high-risk regions.

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