South Africa, Gauteng · 2019-03-13 · from the WORLDHUMMAP archive
A low hum in South Africa, Gauteng
Low frequency droning noise which has a vibration to it Yes - where do I think the source is? There is a Mushroom factory 2km up the road, the have a cooling plant an extractor fans that run 24x7x365. The factory is on a ridge and although they have walls around the property of 21 acres, the sound goes up and travels across the valley and bounces against my house, vibrating all the molecules. This is a multifrequency mechanical or acoustic resonance affected by air temperature. It is this factory with poor quality equipment causing air particle vibrations. It also upsets my animals - dogs and horses. Other people can hear it too, but very few men!!
What they reported
First noticed: 2017
Pitch: 130 hertz - Sine
Loudest: During the night
Where: Indoors
Symptoms: Ear discomfort (pain, fullness, throbbing), Headache, Insomnia, Nausea, Sense of vibration, Anxiety, Ache in the mastoids and ear canals
Changes with weather: Yes, more audible when it is colder
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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