USA, Plano tX · 2018-02-18 · from the WORLDHUMMAP archive
A low hum in USA, Plano tX
very low frequency that drops maybe a full step intermittently then returns to same frequency as usual. Since I've moved several times in the last decade (5 times for work) I can add I never heard this till I moved to Plano, TX 5 months ago (September 2017) nor do I remember hearing it in any of the cities I traveled to by car to work for 20 years. If I did it wasn't consistent enough to notice.
What they reported
First noticed: 2017
Pitch: 82 Hz dropping to 76 then back to 82...but maybe I'm hearing harmonics?
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, Sense of vibration, Anxiety, a need to drink or take medication to sleep (serious)
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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