I've been hearing it, at varying volumes from time to time. I also describe it as someone leaving a car running a few houses way. Going outside with the sound of the wind, and faraway cars makes it harder to detect. Once I walked a miles radius at 5am in the summer trying to find where it is from.
I assumed it was an all night nightclub. The hum was beat like, like the bass line from some fast dance music. But I've also heard it during the afternoon at home. Sometimes I thought I could hear higher pitched drum beat instead of a hum. I've heard this in two locations. Usually indoors is where it seems the loudest. I like the idea about sea waves, but I think it could be more mechanical in nature. Perhaps radio waves interacting with quartz crystals in bricks, cement or (around here) limestone blocks.
Note, I think this "hum" could be different or the same as the Hummadruz which has been recorded for centuries and is like bees humming. See http://www.northernearth.co.uk/permhum.htm for some more info.
"In 1878 R.E.Bibby, a local musician and composer, recalled from his 1820s childhood a low drone or humming noise heard in suburbs to the south and east of Manchester, especially Gorton, Rusholme and Longsight. It was heard on calm, clear days, usually in the early morning or at dusk. "
I assumed it was an all night nightclub. The hum was beat like, like the bass line from some fast dance music. But I've also heard it during the afternoon at home. Sometimes I thought I could hear higher pitched drum beat instead of a hum. I've heard this in two locations. Usually indoors is where it seems the loudest. I like the idea about sea waves, but I think it could be more mechanical in nature. Perhaps radio waves interacting with quartz crystals in bricks, cement or (around here) limestone blocks.
Note, I think this "hum" could be different or the same as the Hummadruz which has been recorded for centuries and is like bees humming. See http://www.northernearth.co.uk/permhum.htm for some more info.
"In 1878 R.E.Bibby, a local musician and composer, recalled from his 1820s childhood a low drone or humming noise heard in suburbs to the south and east of Manchester, especially Gorton, Rusholme and Longsight. It was heard on calm, clear days, usually in the early morning or at dusk. "