AnomalySorta like a load a loaded generator that is maintaining a constant load. It has that phase oscillation, that three phase motors have Very low sound frequency. Not electrical but definitely rotor driven. Reminds me of a long wall shear in a coal mine but there are no coal mine near here. Does the noise move? Does it seem to get nearer and then farther? Is the sound all encompassing or does it have a direction? Is the sound the same standing or sitting?
United States of America, Tidioute · 2024-03-14 · from the WORLDHUMMAP archive
An account in United States of America, Tidioute
What they reported
First noticed: 2018
Pitch: 54
Loudest: During the night
Where: Indoors
Changes with weather: Winter is worse
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.