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.”

submitted by neolib from apnews.com

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[–]turtlew0rk 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (1 child)

Seems like the beginning of a disaster movie....

[–]neolib[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

See also this:

Mysterious sounds in stratosphere can't be traced to any known source

Solar-powered balloons floating 20 kilometres above ground have recorded inaudible low-frequency signals that have so far not been traced back to any known source

https://www.newscientist.com/article/2373236-mysterious-sounds-in-stratosphere-cant-be-traced-to-any-known-source/