🔬 Science May 10, 2026 · Jacek Krywko

Huge landslide created a 500-meter-high tsunami in a major tourist area

Ars Technica Science
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Huge landslide created a 500-meter-high tsunami in a major tourist area
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At 5:26 am local time on August 10, 2025, a massive wedge of rock with a volume of at least 63.5 million cubic meters detached from a mountain above Alaska’s Tracy Arm fjord. The falling rock plummeted into the deep waters at the terminus of the South Sawyer Glacier and caused an initial 100-meter-high breaking wave that tore across the fjord at speeds exceeding 70 meters a second. When this wave hit the opposite shoreline, it surged up the steep rocks to a height of 481 meters above sea level.

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