USA, California · 2021-10-10 · from the WORLDHUMMAP archive
A low hum in USA, California
Very low humming, vibration with tumbling, grinding quality that waxes and wanes every second (0.92 average calculated over 50 cycles but these cycles also vary from less than a second to more than second at times), appears to be two or more waves merged together that create this note. Most of people start hearing it around age 40, per comments on internet. I am wondering if it is because of the changes in our hearing apparatus, as we age, that makes us more aware of it. In younger years we are able to hear higher frequency sounds but lose that ability as we age. Maybe, it is that we have this expansion of hearing ability on the lower end of the spectrum when we turn 40 or 50. (at least for some people)
What they reported
First noticed: 2020
Pitch: 27 Hertz
Loudest: During the night
Where: Indoors
Symptoms: Sense of vibration, Annoyance
Changes with weather: I have not paid attention to this aspect but will pay now. In California our summer weather is dry and in 60s-70s Fahrenheit with no significant changes.
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both described a low hum
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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