US, California · 2018-05-15 · from the WORLDHUMMAP archive
A low hum in US, California
Very low frequency rumbling, like an engine idling at a distance I put together a simple experiment: connected microphone to PC and downloaded some free spectrum analyzer software. In range 0-100Hz, it shows single large pick at about 20.5 Hz, which is one of Schumann resonance frequencies. It makes me to believe Schumann resonance is the root cause of the hum. Probably not every microphone can pickup such a low frequency, I'm using Yamaha YPAO Calibration Microphone, which came with Yamaha A/V receiver, and it worked.
What they reported
First noticed: 1998
Pitch: 20Hz
Loudest: During the night
Where: Equal indoors and outdoors
Symptoms: Insomnia;Sense of vibration;Anxiety
Changes with weather: It does, but I'm not sure how
Humming/ rumbling in ears that can last months or come and go over days. Extremely stressful after all tests reveal nothing wrong. Causes stress and anxiety. Feels like an invasion when you …
ohhhh Wow...thank you thank you thank you....so I'm not crazy!!! I am sensing something. I live in the NE US. I can certainly relate to this, I hear/sense it a lot, usually late in the eveni…
A disturbing, vibrating, continual rumbling sound that gets louder at night when other sounds are reduced. The noise/vibration/frequency prevents me from sleeping many nights or from ever sl…
Low, soft rumble - as if a large truck were idling in the distance - it varies, but not rhythmically - I can almost "feel" the vibrations. Most predominantly at night, in the bedroom on the …
It's a deep, rumbling sound that is similar to a running diesel engine, or music with a deep bass being played. Although it helps to play music/put on a fan to drown out the hum, putting my …
Very low pulsating rumble. Not unlike a distant diesel engine. I used to live near an alloy plant that had cooling towers with a very similar sound but this is much lower in frequency. The v…
Like a constant low-frequency humming noise, like an idling diesel engine at around 67 Hz. Quite often very invasive. The local environmental authorities ran some audio recording with a clas…
the accounts read alike, found by meaning rather than by shared details
Keep reading
There are thousands more like this in the record. Open one at random, or read the ones the most people recognise.
Or if something like this happened to you, write it down and we will look for the others who saw it too.
Know someone this happened to?
If this reminds you of something a friend or a relative told you once and never mentioned again, send them this page. Reading that a stranger described the same thing is usually the part that helps.
Nothing is tracked back to you and nothing is sent on your behalf. The link is just the page you are reading.
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