Lower frequencies of sound do travel further in water (in general in any media, the high frequencies get rolled off quickest), but I wonder if that was the reason?We used to get a ship in here a few years back Lion I think the name was
but you could ear it 3 or 4 miles out, the noise was the engine room ventilators
you alway knew when she was about.
That reminds me of old fashioned hydraulic water-rams which generally can be heard at quite some distance off.A friend lives on a Scottish Loch and when he is on the phone you can ear a generator of the Donk - Donk- Donk verity that is over 3 miles away powering a house on a island.
High pressure gas pipelines - it's an interesting theory if not totally convincing..
The full article at the link: https://www.theatlantic.com/magazine/archive/2019/11/the-end-of-silence/598366/Why Everything Is Getting Louder
The tech industry is producing a rising din. Our bodies can’t adapt.
Karthic Thallikar first noticed the noise sometime in late 2014, back when he still enjoyed taking walks around his neighborhood.
It was during one of his strolls that Thallikar first became aware of a low, monotone hum, like a blender whirring somewhere in the distance. It was irritating, but he wrote it off. Someone’s pool pump, probably. On another walk a few days later, he heard it again. A carpet-cleaning machine? he wondered. A few nights later, there it was again. It sounded a bit like warped music from some far-off party, but there was no thump or rhythm to the sound. Just one single, persistent note: EHHNNNNNNNN. Evening after evening, he realized, the sound was there—every night, on every street. The whine became a constant, annoying soundtrack to his walks.
FULL STORY (With Multiple Videos):What's causing a spooky hum to fill parts of San Francisco?
The Golden Gate Bridge hums now.
San Francisco residents shared recordings of the sound on social media last week and over the weekend as high winds swept through the Bay Area. One Twitter user described the sound as a "three-tone dissonant soundtrack," and others reported hearing it from as far away as 3 miles (4.8 kilometers). ...
SF311, which provides non-emergency services and information for San Francisco residents, tweeted that slats installed along the bridge's bike path were responsible for the noise, citing the Golden Gate Bridge sergeant, an officer with the California Highway Patrol. ...
The local National Weather Service office tweeted that west-northwest winds of 30 to 35 mph (48 to 56 km/h) had been reported in the area, with gusts up to 43 mph (67 km/h). Even higher winds were reported in nearby counties. ...
KQED reported that the slats were added as part of a "necessary" long-term effort to make the 83-year-old bridge more aerodynamic and insure its long-term structural integrity. Wind tunnel models of the retrofit had already shown the slats might hum under certain conditions. ...
The effect has turned the bridge into a giant wind instrument — maybe the world's largest — as one Twitter user noted. ...
Flintshire Council is investigating the cause of the sound which started six weeks ago and is keeping families awake at night
A mysterious low humming noise is making life a misery for residents in Deeside
The sound over Connah's Quay, Flintshire, first started around six weeks ago and has got more intense over the last month.
It got so bad that local man Richard Field says he's had to leave his home to stay with his girlfriend some nights to get some respite.
He described it as a "humming noise, around 50htz with pressure as if your ears need to pop".
Mr Field, 45, said it usually lasts up to an hour before it stops and then restarts around an hour later, all throughout the night.
My hearing used to be that good when I was young. I can still hear myself blink now, even though I am fairly deaf in one ear.I think it is a well known fact by now that some people can hear things that others can't.
Some people can hear themselves blink, some people can hear lamp posts.
An investigation has been launched following complaints of a strange humming sound reportedly being heard across a Cheshire East town.
A Facebook group - called the Haslington Hum - has been set up by residents who have reported hearing the strange sound.
Some neighbours say the "constant hum" has led to sleepless nights, unproductive work days and left many at their wits' end.
However the source of the noise is yet to be found.