Hums, Booms and other strange earth noises

[Goldengirl]

Going to start a thread for the bizarre noises that have been plagueing the earth in the past few years. They aren't going away, and as far as I can tell, something strange is taking place and about to blow.

Please feel free to park any additional links and commentary here. Thanks in advance for any thoughts or new reports!

Plymouth Hum is Joined by a New Creepier Mystery Sound
http://mysteriousuniverse.org/2017/02/pl...ery-sound/