Here is a spectrograph of this bizarre sound:



747 Jet engine full throttle, same program, same track, so exact same plugin and everything:


A few things to keep in mind:
1) Very bottom is 35 hz
2) Notice what appears to be harmonic bands
3) Her camera likely could not pickup below 20 Hz, if that, and more likely 30 or 40 Hz on the low end
4) And that's what makes this even more bizarre. Had you been there, there was likely frequencies going way down to be shaking the house, and those are neither present in the wav file or in the spectrograph. The mic in the camera simply cannot respond to frequencies that low, so that must have been absolutely terrifying.
5) I'm stumped. Unless that was the most massive harmonic tremor ever, and Florida is getting ready to erupt with a supervolcano...

I don't know what it is but I find the noise quite soothing on the ear.

I live in Iowa and I hear the same rumbling during the winter. It just goes on and on. I mentioned it to my husband one day and he said "its an airplane", But I pointed out to him that the rumble just continues and doesn't subside. Ive heard it go on for an hour, so I know its not an airplane. I also dont believe the thunder theory because we dont have thunderstorms in the dead of winter.

This intrigues me- Ive always wondered what causes the rumble!

Originally posted by JakiusFogg
To me, that sounded like a large aircraft doing Full Power Engines Runs.

They can last for some time. as they are timed for Exhaust Gas Margin calculation.

They can be loud, and if the winf is in the right direction then????

I am just saying that's the first thing I think of when I see that video. and hear the noise.

I'll have to agree! I live just a few miles from an airport and will say that I'm so used to that particular sound, it becomes background noise and hardly take notice to it. I watched the vid all the way through, and she does say that she's just a few miles away from the airport. Plus with that low cloud cover I'm pretty sure the sound was way louder than it would be on a bright sunny day!

My $.02

I hear those noises just about every night between 2am and 4 am and the last for at least an hour and then just stop. We have an airport but it closes before midnight and opens at 6am.. My dad is retired from the railway and says its not trains. No military bases nearby....
BTW I live in interior of B,C, Canada.

OK Have found that there are indeed at least 2 MRO located at KTLH

One is called Aero Associates the other A.R.T.

The latter has capability to handle lager aircraft (up to 737). including engine change. After which a ground run would be necessary. with anything up to 65% N1, or higher if needed.

It's stab in the dark, but I am going to go with aircraft engine running. As much as I would like it to be Independence Day.

Jet engine?
Hmmmmm

Let's see, ground vibrating, 20 minute roar, flash of light, roar ceases seconds later. I am more comfortable not coming to a conclusion on this thing yet. BTW this was filmed on 3/9/11.

Ok, see above post, I edited it to show both, and I took care to get a very quality file of both at 44.1 kHz stereo.

They look a bit similar, but I dunno...tossup.

EDIT: hmm, the first one doesn't have the higher frequency content....strike one.

The first one doesn't have some of the lower frequency content....strike two....ummm...

Originally posted by TrueAmerican
Ok, see above post, I edited it to show both, and I took care to get a very quality file of both at 44.1 kHz stereo.

They look a bit similar, but I dunno...tossup.

EDIT: hmm, the first one doesn't have the higher frequency content....strike one.

The first one doesn't have some of the lower frequency content....strike two....ummm...

edit on Sun Mar 20th 2011 by TrueAmerican because: (no reason given)

That was fast, thanks!! They look different to me.

Originally posted by TrueAmerican
Ok, see above post, I edited it to show both, and I took care to get a very quality file of both at 44.1 kHz stereo.

They look a bit similar, but I dunno...tossup.

EDIT: hmm, the first one doesn't have the higher frequency content....strike one.

The first one doesn't have some of the lower frequency content....strike two....ummm...

edit on Sun Mar 20th 2011 by TrueAmerican because: (no reason given)

Thanks so much for that, super fast too- you must be non-government *haha*
I'm no expert in this subject but they look distinctly different to me...