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Denmark’s mystery tremors caused by “unknown source”, officials say

A series of minor tremors recorded on the Danish Baltic island of Bornholm Saturday has puzzled scientists, who now say they were caused by “acoustic pressure waves from an unknown source.”

At first the tremors were thought to have been caused by earthquakes. Then, seismologists theorized that they originated from controlled explosions in Poland, more than 140 kilometers (nearly 90 miles) to the south.

On Monday, the Geological Survey of Denmark and Greenland, an official body that monitors the underground, said the tremors were “not caused by earthquakes, but by pressure waves from an event in the atmosphere.” However, they came from “an unknown source.”

“The seismologists can report that it is unlikely that the tremors originate from a controlled explosion in Poland, which was carried out shortly before the first reports of tremors on Bornholm,” the body known as GEUS said in a statement.

On Saturday, GEUS said it had received “more than 60” tips from people on Bornholm that “earthquake-like tremors”—described as a deep rumbling, shaking and rattling, changing pressure in the ear—had been reported in the afternoon on Bornholm.

Fortunately, nobody was hurt, but the source of the quakes still remains something of a mystery.

Source: phys.org

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