By Bond Robertson 
Experts have changed their minds and there is now no clear answer as to what caused mysterious tremors on the Danish island of Bornholm this weekend. After initially referring to the eruptions in Poland, they now believe it to be an “atmospheric event” with an unknown source, the report says National Geological Surveys of Denmark and Greenland (GEUS).
– Researchers cannot conclude the cause of the strong pressure waves, GEUS wrote on Monday.
pressure on the ears
More than 60 residents of the Baltic island surrounded the geological office on Saturday afternoon. Callers reported deep gurgling, pressure in the ears, and that he shook and shook, Trine Dahl-Jensen, assistant professor at GEUS, told news agency Ritzau, which was relayed Danish TV2.
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– It was very uncomfortable. One resident wrote that it came several times in the form of pressure waves Twitter.
Police said that the earthquake caused a crack in the wall of a house in the town of Snogbek, southeast of the island.
speculation
Speculation grew among the locals, who spouted theories about the earthquakes as well as a secret military operation. Many of them have fresh memories that sabotage against the Nord Stream 2 gas pipeline took place outside Bornholm in September.
However, the researchers did not record any nearby earthquakes, and initially reported that “there was a seismic event in northern Poland”.
– It sounds like an explosion, so we assume that’s what we’re talking about. But GEUS lecturer Jensen told Ritzau on Sunday, “We’re not sure of that.”
Now the Danish researchers have another theory, without providing any definitive answer.
– probably [skyldes rystelsene] Acoustic pressure waves from one or more events somewhere in the atmosphere. However, researchers cannot deduce the cause of the strong pressure waves, the institute writes.
The supersonic theory
Tremors were also felt in Blekinge and Öland in southern Sweden. Swedish seismologist Bjorn Lund at Uppsala University launched the theory on Monday Express:
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– When we receive reports of roar or vibration, it almost always means that the Air Force has broken the sound barrier at sea, the researcher says.
According to Ned, atmospheric conditions made it possible for the sound waves from the supersonic explosion to roll inward. The fact that earthquakes and eruptions are out of the picture, and that messages come from a wide geographic area, is believed to support this theory.
– What you feel is not a tremor in the ground, but a wave of pressure in the air. It can make a sound, says the seismologist, and people often report windows shaking.
No air defense country confirmed on Monday evening that its aircraft had broken the sound barrier in the relevant area and time period.