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Tracy Arm’s Post-Tsunami Landscape

NASA Science·NASA Earth Observatory·25 days ago
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Image of the Day for May 8, 2026 A landslide-triggered tsunami stripped vegetation from the shore of the glacial fjord in summer 2025. May 08, 2026 View more Images of the Day: Carved over millennia by the pressure and motion of glacial ice, the valley walls cradling the Tracy Arm fjord in southeast Alaska continue to be reshaped. In summer 2025, following the rapid retreat of South Sawyer Glacier, a large landslide sent rock careening into the fjord, altering the wider landscape in a matter of minutes. The slide culminated on the morning of August 10, 2025, when at least 64 million cubic meters of rock slid downslope. Material entering the fjord induced a tsunami that stripped trees and other vegetation from the opposing fjord wall up to 1,578 feet (481 meters) above sea level. While this peak was the highest “runup” reached by the tsunami, shores and islands down the fjord also saw substantial destruction.…

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