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Mystery Tremors On Danish Baltic Island Puzzle Scientists

SimonBurchell

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From The Guardian:

Mystery tremors on Danish Baltic island puzzle scientists

Minor tremors on Bornholm caused by acoustic pressure waves originated from ‘unknown source’, seismologists say

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

At first the tremors on Saturday were thought to have been caused by earthquakes. Then, seismologists theorised they originated from controlled explosions in Poland, more than 90 miles (140km) to the south.

On Monday, the Geological Survey of Denmark and Greenland (Geus), 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”.
 
Sometimes you can get "atmospheric ducting" where sounds travel through the atmosphere in zones and end up impacting areas very far away. It's weird and hard to find good info on it.

I think additional study on this may enlighten us on the shoreline "guns" phenomena that have been reported for centuries (Seneca, Barisol, etc.)
https://spookygeology.com/mystery-booms-and-skyquakes/
 
Sometimes you can get "atmospheric ducting" where sounds travel through the atmosphere in zones and end up impacting areas very far away. It's weird and hard to find good info on it.

I think additional study on this may enlighten us on the shoreline "guns" phenomena that have been reported for centuries (Seneca, Barisol, etc.)
https://spookygeology.com/mystery-booms-and-skyquakes/
This web page seems to explain how it works, and that it seems to have 'two-way' directional effects.
https://wattsupwiththat.com/2011/04/17/atmospheric-audio-ducting/
 
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