Australia Qld Cannonvale 4802 · 2020-06-10 · from the WORLDHUMMAP archive
A very low frequency hum usually occurs at night whilst in bed although I have continued to hear it when trying to isolate the source. It can at times sound quite loud but for the most part it resembles distant machinery. It seems to come and go in that I can go weeks without hearing it and then I will hear it nightly for several weeks. I have for years discussed this with my wife and it is only recently that I have discovered I am not alone. It would be great to get an answer.
What they reported
First noticed: 2003
Pitch: 70Hz although I suspect lower. I can't hear lower on my device.
Loudest: During the night
Where: Indoors
Symptoms: Nothing.
Changes with weather: Not that I have noticed
What stood out: a low hum
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the accounts read alike, found by meaning rather than by shared details
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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