Videos definitely have me freaked out. Never hurts to pray (whether they’re fake or not). Sometimes large industrial generators (like in a dam powerhouse) can telegraph similar sounds when out of balance but many of these sites are far out of range. Wonder if HAARP could create such audio phenomena? (especially since many of these are at northerly latitudes).
When I went outside, it did not sound like anything I had heard or felt before. It was bigger than the really loud man made stuff we just ignore in life.
After I could not dismiss it as a very loud train (because I am not near any trains), I told myself at the time that it seemed to be coming from the heavens...but I have no clue what it was, really. It did not seem to me at the time to be coming from the earth. Others around here heard it as well. My husband heard it at work and told himself it was a really loud ship (he never hears ships at work! LOL).