Overview

• SWOT’s Ka-band Radar Interferometer captured cross-channel water slopes of up to two meters, providing the first direct evidence of seiches oscillating in the fjord.
• Two glacier-destabilized landslides in September and October 2023 generated mega-tsunamis with initial amplitudes of about 7.9 meters and forces near 500 GigaNewtons.
• Ultra-low-frequency vibrations recorded every 90 seconds for nine days were conclusively linked to fjord seiche oscillations after ruling out tides and wind.
• Progressive thinning of the Dickson Fjord glacier, driven by anthropogenic warming, was confirmed as the trigger for the catastrophic slope failures.
• The study demonstrates how next-generation satellite altimetry can monitor remote Arctic hazards and inform assessments of future glacier-related landslide risks.