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In September 2023, the scientific community was jolted by an extraordinary seismic anomaly that puzzled researchers around the world. Unlike normal earthquake tremors, this signal detected from the Arctic to Antarctica resonated continuously with the same vibration frequency, which lasted for an astonishing nine days.
Initially classified as an “unidentified seismic object” (USO) due to its mysterious nature, the source of the signal has now been identified: a massive landslide in Greenland’s remote Dikson Fjord.
The extraordinary event saw a huge mass of rock and ice, equivalent to 10,000 Olympic swimming pools, crash into the fjord. The impact generated a huge tsunami with waves up to 200 metres high – twice as high as London’s Big Ben.
The tsunami, as well as the landslides, generated a prolonged and intense storm surge, which produced oscillating waves in the fjord that continued for nine full days.
The landslide was caused by the thinning of the glacier, which is a direct result of global warming. A new study published in Science shows that the unusual seismic signals were created by standing waves within Dikson Fjord, generated by massive rock slides. “Our research underscores the serious impacts of climate change on Earth’s systems,” the study says.
In recent decades, the glacier thickness in Dikson Fjord has decreased significantly, weakening the supporting mountain structure. This instability caused seismic disturbances that reverberated around the world, highlighting a new dimension of the impact of climate change.
The incident is a stark reminder that climate change is affecting not just weather and sea levels, but also geological stability. As glaciers thin and permafrost warms, scientists fear a rise in similar catastrophic events in polar regions.
The Greenland landslide is a compelling example of how global warming is reshaping the planet, and shows that seismic anomalies and natural disasters may occur more frequently in the future as temperatures rise.
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