Video: How a Giant Tsunami Devastated an Alaskan Fjord

A stunning visualization, born from a recent study published in the prestigious journal 'Science,' offers a dramatic glimpse into the power of nature unleashed in an Alaskan fjord. On August 10, 2025, a colossal landslide, involving an estimated 60 million cubic meters of rock, cascaded into the water at the foot of a glacier. This catastrophic event generated a tsunami of unprecedented scale, with the wave reaching an astonishing altitude of 480 meters against the fjord's mountainside.

The sheer force of the rockfall, described as ten times greater than a similar event in Blatten, Switzerland, created a series of immense waves. The largest of these measured a staggering 100 meters in height and propagated at speeds up to 250 km/h. These powerful surges traveled the length of the fjord, extending 50 kilometers out into the open sea, demonstrating the far-reaching impact of the initial collapse.

By sheer luck, the disaster struck in the early morning hours, at 5:26 AM. This timing meant that the tourist-heavy fjord was devoid of human activity, preventing any potential loss of life. While the event serves as a stark reminder of geological hazards, particularly in regions like Alaska known for seismic and glacial activity, the scientific analysis provides invaluable data for understanding such extreme natural phenomena. The visualization allows researchers and the public alike to comprehend the immense scale and devastating potential of these tsunamis generated by landslides.