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Alaska’s monster tsunami sent water 1,580 feet up a mountain

A massive landslide in Alaska triggered the second-highest tsunami ever recorded, sending water and debris 1,580 feet up a mountainside just hours after tourists visited the area.

  • Tsunami reached 1,580 feet up mountain on August 9, 2025
  • Hanse Explorer cruise ship near South Sawyer Glacier when landslide occurred
  • Alaska Earthquake Center study details tsunami's impact on fjord

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