Spokane, Washington – February 3 2013. More strange noise sounds different than the humming in the night sky that is coming from everywhere. I live off the grid on a remote mountaintop about 40 miles north of the nearest city of Spokane WA USA and 15 miles from any rural highways and have absolutely no plausible explanation for what I heard. This entire area is quite isolated and in the grips of winter with all local logging operations having been mothballed for the last two months until spring.
Albania – February 5 2013. Can not explain where it is coming from, it seems as if it is coming strait from the sky with not a single plane in sight…. What is this!? ..is it HARRP!? or Something to do with Project Blue Beam!? No, only sirens!!!
Strange Sounds in Red Deer, Alberta, Canada – February 3 2013
Strange Sounds in Amsterdam Modern Art Museum
I also came across this general science article on why canyons etc. can act like pipe organs when wind funnels through them.
http://www.reality-choice.org/214/strange-sounds-worldwide-phenomen
A great explanation is here 🙂
http://youtu.be/xEqCRtSZ96k
he mentions ‘brontide’ seismic episodes. . .