USA Portland 97206 · 2018-03-18 · from the WORLDHUMMAP archive
A throbbing hum like a generator, machine or engine idling When I first noticed the sound I thought someone was using a jackhammer in the middle of the night and called up the city to find out the location. They said there was no road work going on in my neighborhood
What they reported
First noticed: 2014
Pitch: Triangle wave 35hertz
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, No discomfort but it drives me crazy
Changes with weather: I have never heard it in the rain
What stood out: a low hum
Low frequency hum, always same frequency, I'd estimate around 50hz (at least my perception). I only hear it at/in my home, if I'm at another location, I don't think I've ever heard of it. …
both described a low hum
Low pitch hum estimating around 50-100hz The sound is not a perfect pure tone, and has slight volume changes, it sounds similar to the hum of a fan motor. I have driven around in an attempt …
both described a low hum
A low frequency Hum sound that fluctuates subtly but for the most part is steady The Hum is a low frequency and droning sound and it kind of fluctuates in tone.. almost like an idling diesel…
both described a low hum
Very low-pitched continuous drone. Pitch rises and falls slightly but can remain steady at times. Inaudible to my wife. Reminiscent of the hum from a large transformer/sub station but there …
both described a low hum
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…
both described a low hum
Low hum, sometimes pulsating, sometimes not. It is very loud. It sounds like a propeller airplane way off in the distance, but it doesn├»┬┐┬╜t go away. Or an 18-wheeler on a busy freeway, …
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