posted on Jan, 6 2015 @ 05:27 PM
a reply to: westcoast
background.... quite a few years ago, like the 1970s era I think
there was another spate of rumblings that emanated from no visible source and came from 'nowhere'
the SciFi magazines had theories made by other authors that these rumblings were sounds from WW2 aircraft
I did note that in the OP LINK to the MP3 there was a segment towards the 1st two minutes which sounded exactly like propeller aircraft...
the explanation back then was the propeller WW2 aircraft sounds were time projections or time anomalies where the sounds of the aircrafts hit a time
warp but the visual/physical craft were not materialized
just saying.... those sounds, noises...have been going on for generations--- even centuries in different places in the contiguous 48 States... the
Hudson Valley is another rumbling spot... eerie rumbling for/by no apparent reasons (like storms or construction or military exercises)
hope this expands your inquiry/thread