‘Mega’ tsunami of Greenland in 2023 echoed for 9 days, shook sensors worldwide: NASA

A landslide, which occurred in mid-Sept 2023, sent over 880 mn cubic feet of rock and ice plunging into the Greenland's Dickson Fjord, generating a tsunami.

A massive rockslide in Greenland in 2023 triggered a rare and persistent ‘mega' tsunami of sorts that ricocheted within the steep walls of a remote fjord for nine days, according to new satellite data released by NASA and international researchers.

The international Surface Water and Ocean Topography (SWOT) satellite mission, a collaboration between NASA and France’s CNES (Centre National d’Études Spatiales), detected the tsunami's contours.

The event, which unfolded in the Dickson Fjord in eastern Greenland, was captured by the Surface Water and Ocean Topography (SWOT) satellite — a joint mission between NASA and France’s CNES — revealing never-before-seen details of how water surged and tilted inside the fjord after the impact.

The landslide, which occurred in mid-September 2023, sent over 880 million cubic feet (25 million cubic meters) of rock and ice plunging into the Dickson Fjord, generating a tsunami that lacked space to dissipate. Instead, it bounced back and forth within the confined waterway — rising and falling every 90 seconds.