This stuff happens everywhere all over now. People just refuse to believe it or even listen for it. I hear it in NC at times and several other people do to. My father heard it MN as well as family members in CA,NV and CO.

It is probably some transmitter or something broadcasting something. Who knows what the hell it really is.

I did have one geologist in GA try to explain it to me one time. A few years ago he said it was an ice plate the was being super heated and it is pressure being released but he said the difference with those is that you usually had a small quake when it happened. He really did not know either but he did at least give me an idea of what it could be.