Reporting supernatural-sounding and appearing phenomena has become all the rage, but I can’t help being skeptical. Ignorance of cause brings about all kinds of hysterical reactions and explanations. I tend to go with the “pranksters” explanation until more data is available. People can be ingenious when creating hoaxes, and there are more than enough high-power audio systems throughout the world capable of generating other-worldly sounds.
On another tack, secret scientific research may explain such things, but I can’t imagine it being so wide-spread unless it is in the area of transportation. New forms of propulsion may generate loud, unheard of, noises, and spread it far and wide.
If these were supernatural phenomena, I suspect they would be more widespread. On the other hand, prophets of the Bible explained what they saw and heard according to their limited frame of reference. They may well have previewed what is happening today and were unable to explain it.
If these manifestations are of the end-times variety, worrying about it will profit us nothing; our only sensible response is to obey God’s clear commands and be ready when He comes. If you aren’t sure of your eternal destiny, God’s Word will tell you all you need to know to assure your eternal salvation, and here’s a link to a common-sense gospel presentation. Why fear the unknown, when our Savior knows all and loves all?