Alaska’s Tracy Arm Landslide Sparks a 481-Meter Tsunami, Raising Climate-Hazard Warnings
TL;DR Summary
Scientists reconstruct the August 10, 2025 Tracy Arm event: a 63.5‑million‑cubic‑meter rockslide into Alaska’s narrow fjord generated a 100‑meter breaking wave that climbed to 481 meters on the opposite shore, the second-highest tsunami on record. The extreme runup was amplified by the fjord’s confinement and linked to climate‑driven glacier retreat thinning the ice that once stabilized the slope; microseismic signals days earlier may offer precursors. No injuries occurred thanks to early‑morning timing, but rising cruise-ship traffic underscores the need for early warning systems for similar hazards.
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- Study recreates mega-tsunami in Alaska fjord CNN
- Megatsunami in Alaska’s Tracy Arm was the second-highest ever measured Alaska Beacon
- Engineer creates video game of Alaska’s Tracy Arm landslide, which generated a megatsunami Alaska's News Source
- May 9: A CN Tower-sized mega tsunami, and more… CBC
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