Reconstructions of what the weather was like during the days SWOT picked up the signal also show that it couldn’t have been anything but a seiche. For nine days in 2023, an unknown seismic pulse was generated by the Earth every 90 seconds. It remained a mystery, even though studies at the time found seismic data that seemed to align with the sloshing motions of standing waves. Tsunamis are often seismic phenomena, and the very long period (VLP) seismic signal that came from the fjord was the aftermath of a tsunamigenic landslide. “SWOT is a game changer for studying oceanic processes in regions such as fjords which previous satellites struggled to see into.”