Netherlands, Zutphen · 2018-12-29 · from the WORLDHUMMAP archive
A low hum in Netherlands, Zutphen
almost inaudible low bass, coming in waves with different durations and interruptions Outside the door, the sound is masked by noises like traffic and birds etc. Indoors the sound is easily masked by computer fan, fridge motors, heating etc. Because of the soft and low frequency you need good ears and a silent place. Because of the low trembling ear protection doesn't help much, I think the sound is resonance from heavy machines: gass transportation lines or high-pressure metal rollers used in industry nearby.
What they reported
First noticed: 2018
Pitch: 13.4 hz square comes closest
Loudest: Equal night and day
Where: Equal indoors and outdoors
Symptoms: Sense of vibration, Irritating
Changes with weather: It is the same with dry, rain, southwest wind or northwest wind.
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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