Alaskan Glacier Collapse Unleashes 481-Meter Tsunami in Tracy Arm Fjord
A gradual retreat of the South Sawyer Glacier exposed unstable rock above Alaska’s Tracy Arm Fjord, triggering a sudden rockfall on Aug 10, 2025 that generated a 481-meter tsunami—the second-largest on record and the largest not caused by an earthquake—amplified by the fjord’s narrow geometry and a lingering seiche; scientists warn this climate-linked hazard could rise as more infrastructure enters vulnerable areas.