Skyquakes:
https://www.thoughtco.com/science-of-skyquakes-4158737
Possible causes:
https://www.seismosoc.org/Publications/SRL/SRL_82/srl_82-5_op/hill_op.html
BBC article on mysterious bangs:
https://www.bbc.com/future/article/20141202-mystery-booms-whats-the-cause
VERY extensive list of mystery booms. Great resource!
https://strangesounds.org/mystery-booms-and-rumblings
Example of booms with flashes of light:
https://www.youtube.com/watch?v=JovJlFJbsPg
Great day time example. Note how the sound is explained. This isn't thunder!
https://www.youtube.com/watch?v=sxJR2X5shQ0
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