First I thought of a running washing machine. A Diesel engine or distant road construction is close too. Furthermore there is a fast bubbling sound like Geiger counter or the bubbling of a aquarium air pump or boiling water I used online tonegenrator in advance to the hum, experimenting on relaxing sound. The hum frequency appears to be related to the binaural beats I was using.
What they reported
First noticed: 2019
Pitch: 72 hz
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, Sense of vibration, Severe nightmares in the beginning
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both described a low hum · 119 km away
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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