Sweden, Umeå 905 00 · 2019-12-26 · from the WORLDHUMMAP archive
A low hum in Sweden, Umeå 905 00
Low continous sound, like a diesel generator or tractor that revs at around 1500 rpm per minute, although distant, like it is running approximately 500 - 1000 meters away. Very low frequency. I first noted the hum when I was living near a swedish radio broadcasting station.
What they reported
First noticed: 2004
Pitch: Around 65 hertz I think, but it is not exactly the same
Loudest: During the night
Where: Indoors
Symptoms: Sense of vibration
Changes with weather: If windy, I don't hear it clearly. Otherwise not.
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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.
Anomaly