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 Rss Apple Podcaster →
