Satellite mission discovers how 650-foot mega tsunami in 2023 left Earth shaking for 9 days

NASA and France's CNES detected the contours of a tsunami in a Greenland fjord in September 2023. It was triggered by a massive rockslide and created a global seismic signal lasting nine days. Experts warn that climate change could cause more such events as Arctic glaciers melt and destabilize surrounding mountain slopes.