Natural History Wanderings

The Conversation reported

Earthquake scientists detected an unusual signal on monitoring stations used to detect seismic activity during September 2023. We saw it on sensors everywhere, from the Arctic to Antarctica.

We were baffled – the signal was unlike any previously recorded. Instead of the frequency-rich rumble typical of earthquakes, this was a monotonous hum, containing only a single vibration frequency. Even more puzzling was that the signal kept going for nine days.

Initially classified as a “USO” – an unidentified seismic object – the source of the signal was eventually traced back to a massive landslide in Greenland’s remote Dickson Fjord.

Read more The skyscraper-sized tsunami that vibrated through the entire planet and no one saw