Low Hum at Night

i wouldnt worry about it too much. there are plenty of things that hum. it could range from your refrigerator kicking in or the neighbor with a new sex toy.

yeah, it's definitely not the fridge or a vibrator! this is a loud hum that permeates the air.

well since you live in california that kind of makes me suspect that it could be the same sound that make animals act weird just before an earthquake. but i could be wrong.

Well im glad you asked cause yes i heard it two nights ago
it was a starry lit night, i was watering the horse at this time, all was quiet except for this low pitched hum
looking up i could see two jet planes very high traveling side by side, one plane was massive like a starlifter while the other was not as large, the big one had three sets of lights on each of its wings
what blew me away was the fact that this direction they were flying in is not a flight path as there is nothing but thousands of miles of sea in that direction, to the south pole
what they were doing flying side by side like that in itself was down right odd

A hum? Sprayer copters don't hum. There was a streetlight outside a place where I used to live that would hum and start to flicker sometimes, like an old fluorescent bulb (which, I assumed, was exactly what was happening). Could that be the sound? Do any of your immediate neighbors have automatic garbage disposals? I know it sounds silly, but it is best to start with the mundane and work your way up.

hmm, interesting! when i hear it again i am going to go outside and see if i can see any planes. i definitely heard one or more helicopters. the noise is a bit offputting, in that i feel wary when i hear it and my instinct is to stay inside and not explore what is causing it.

neesie - perhaps it is quake-related as you mentioned. perhaps i can only hear it at 3am because everything else becomes very quiet outside at that time.

There is a light outside my place that gives the kind if buzzing that you mentioned. In comparison, I guess you could say the sound I am talking about is more like a rumble or a low roar. It's not a buzzing like that streetlights give off. It's much "bigger" than a garbage disposal, too. I don't rule out anything mundane like that, of course. I just can't think of anything that would make sense.

The closest thing it sounds like is somebody running a car motor non-stop for two hours. It might last longer than two hours but I usually fall asleep after hearing it for those couple of hours.

Sabrina can you feel it to
is there a vibration with the hum ?

Yes I'm aquainted with the hum you are hearing. We get it here sometimes. Sounds like a diesl truck idle or something like that but far off. Seems to carry more than a engine would though.

I've been of the mind it is possibly some type of tunneling machinery. Only happens late at night. Central Indiana reporting in.
Out Booner

No shaking or hum in an indeterminate city in the southern half of the U.S. where I am now. Where are you, 184454?

Sabrina, I know you probably already thought of this, but the best idea I have for the noise is the jets you keep seeing. If the lights were turned off and somebody was holding, say, a high-altitude mock dogfight somewhere above your home as military training, you might get that sort of sound. If it is a training exercise, one would expect that the hum varied in intensity over time as the center of the activity drifts towards and away from you.

Crap, they could be playing with an electrostatic hovercraft or a UFO for all we know and there would be no way to tell. Humming and a few planes could be almost anything.

I can't feel a vibration. It's definitely just an audio sensation. It's strange because even though it seems loud it's almost like it's just on the edge of my hearing capabilities because it's such a low decibal.

Do diesel trucks idle at night? I'm just going to have to drive down the street and look around next time I hear it. It's driving me crazy!

I haven't seen any planes - that was another poster. I just hear helicopters now and then in the midst of the constant hum. The hum doesn't change at all over two hours or so.

Wouldn't wast much time looking. I can see for miles around here and have never found a sorce. But good luck with your search.

Duh ! Thats just a ufo hovering above your house. It could even be cloaked and you'd never know. Then of course you hear the helicopters either folling it, or chasing it off. Your in California. A hotspot for ufo activity. If your serious. I'd be hauling ass out of bed and looking outside everytime I heard that sound.

Well its just a thought
you may wish to download a free function generator
and slide the sine wave switch down until the exact frequency is gained, this at least will reveal its pitch and may help you find the culprit

[link to www.download3k.com]

"taos hum".....look it up

Kokomo hum is another.

my neighbor drives a refrigerated diesel truck, and has to run it all nite..maybe?

Take the batteries out of your device

plate grind, leading up to a massive tear ?
keep a close watch on your pets
see how they react to this hum,if they start acting odd
grab ya bug out kit and split

Some power lines will emit a low frequency hum while others can send out a echo-slap effect like that of a electric city trolly bus . The transformers on the power poles make more of a higher pitched buzz.

You mentioned helocopters... Some millitary helo's can be heard comming for 60 miles or better depending on altitude and outside temp. I know I have heard them for close to an hour before they came overhead. Sometimes they jusst circle an area for a long time too!

I'm in Northern California and I've noticed this hum too.

I don't know what it is for sure but I suspect it could be vibrational manipulations from some source or another.

UFO's maybe.

My first instinct when I heard it was to think it was a UFO, but I wanted to be rational and figure out what else it could be! I don't want it to be a UFO.

A tanker truck on idle ... yes, that's it!

My cat noticed it when I let him into the garden at 3am. At least I know I wasn't hearing things!

i have been hearing this deep humming sound not only at night,but day time too,when i stop to listen...its just that usually its too noisy and i am too distracted during the day.

I have likened it to a large fleet if planes flying really high,leaving a deep humming sound.,.weird,been outside to look up at the sky many times when i hear it...

Yes!! That's exactly what it sounds like.

When its relatively silent i can hear high pitched sounds with varying frequency.It may be ultrasound or somethign else.No one else hears them(or at least told me).The sounds dissappear after few minutes
and return suddenly when least expected(usually each several days).

I hear that low hum sound a couple times a week,im in central texas but tonight while watching movies with hubby my ears were all messed up.

High pitch,switching back and forth between ears,i just came upstairs and jumped on computer and checked the weather and the radar for dallas area looks strange.

www.weatherunderground.com

Click the nexrad for dallas


Looks like someone doesnt want that snow and ice to hit the dallas ft.worth area

Hey here is a really weird sound to come out of the ground
thats on a drilling rig, when the cutting head gets to a given depth, it sounds like their are thousands of people all screaming their heads off at once its a freaky sound.

[link to en.wikipedia.org]

Theres your answer. I experience this from time to time, over here in the UK