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Seismologists encountered an extraordinary signal recorded by seismic monitoring stations throughout September 2023, spanning from the polar north down to the Antarctic region.
This signal left researchers perplexed, as it deviated significantly from standard earthquake signals which typically exhibit a rich tapestry of frequencies. Instead, this signal manifested as a steady hum characterized by a singular vibrational frequency. Compounding our confusion, this unique phenomenon persisted for an unprecedented nine days.
Initially tagged as a “USO”—or unidentified seismic object—the origin of this anomaly was ultimately traced to an enormous landslide in Greenland’s isolated Dickson Fjord. The scale of dislodged material was astonishing—equal to approximately 10,000 Olympic swimming pools worth of rock and ice crashing into the fjord. This triggered a colossal mega-tsunami that soared to heights of up to 200 meters and also instigated a seiche—a repetitive wave pattern oscillating within the cold confines of the fjord that continued its movement over ten thousand times across those nine days.
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