The first time I heard it, it was mechanical and very high pitched. It had a slight grinding or mechanical sounds beneath the high pitch. Almost like the sound of a jet flying rooftop level of our home, but around 10 times louder. My 15 year old daughter heard it as well while my other 14 year old daughter slept through it. My dog did not notice it or react to it in any way. It was loud enough to cause both myself and my daughter to cover our ears and double over in pain, but it was NOT the sound of the sound barrier breaking. Had it been actual planes, they would have needed to be flying low enough that we would have experienced shaking windows, etc. None of that happened.
In addition, the sound lasted approx. 5 minutes. We have jets fly over daily. They can only be heard for around 60 seconds and then the sound is gone.
Now I hear a lower hum.
What they reported
First noticed: 2018
Pitch: 1000 triangle is closest to the pitch of the original. Current is close to 320 sine
Loudest: Equal night and day
Where: Indoors
Symptoms: Original caused ear discomfort. Current is more annoying than anything.
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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