Mysterious reports of tremors on a small Danish island in the Baltic Sea prompted a seismological investigation that points toward atmospheric pressure waves as the possible culprit.But as with other, similar eventswhich are surprisingly common around the worldconfirming a cause remains elusive.The tremors occurred on May 13 at around 3 P.M. local time, according to a statement from the Geological Survey of Denmark and Greenland, which operates two seismographs on the island of Bornholm.
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