In September 2023, seismic stations across the globe picked up mysterious tremors repeating every 90 seconds for nine straight days. The signals were eventually traced to Dickson Fjord in East Greenland, where no eyewitnesses, not even a nearby military vessel, reported anything unusual. A study has now confirmed that a rare phenomenon known as a seiche caused those tremors. Let’s know what exactly a seiche is and how it quietly shook the Earth from a remote Arctic fjord in 2023.
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