A Mountain Secretly Collapsed in Greenland. And Then the Earth Rang Like a Bell for 9 Straight Days.
Yahoo • • science
Key Points:
- In 2023, strange seismic signals in Greenland's Dickson Fjord were initially suspected to be seiches, but confirmation was elusive due to limitations in earlier measurement instruments.
- NASA’s SWOT satellite, equipped with the KaRIn instrument, provided high-resolution data that confirmed the signals were from a seiche caused by a landslide-triggered megatsunami.
- The seiche involved standing waves oscillating in the fjord, with wave heights reaching up to two meters, and persisted for days after the tsunami event.
- Previous satellite altimeters failed to detect the seiche due to observational gaps and limited spatial coverage, but SWOT’s advanced capabilities allowed detailed mapping and modeling of the phenomenon.
- This discovery highlights the potential
