whatever it is,i heard something similar, not the high pitched trumpet like noise but the low pitched like rumble noise i guess more like a trombone. whatever it is its creepy, and if you ever happen to hear it for yourself it gives you a very uncomfortable feeling.

Thinking along the same line as well. And pressure along two continental crust edges create grinding when the plates move in opposite direction and that has also been known to release sound waves and/or massive air displacement.

yes, and the "earthquake lights" as well... but i think some of the "machinery" noises are the government making underground bunkers in the northeast...

It's possible and surely in some of the instances. But I wouldn't rule out some supernatural cause. Some very strange happenings are going on around the globe, like those massive holes and all the troop movements. It sure is an exciting time to be alive.

infra-sound!

http://en.wikipedia.org/wiki/Infrasound

Human reactions

20 Hz is considered the normal low-frequency limit of human hearing. When pure sine waves are reproduced under ideal conditions and at very high volume, a human listener will be able to identify tones as low as 12 Hz.[32] Below 10 Hz it is possible to perceive the single cycles of the sound, along with a sensation of pressure at the eardrums.

The dynamic range of the auditory system decreases with decreasing frequency. This compression can be seen in the equal-loudness-level contours, and it implies that a slight increase in level can change the perceived loudness from barely audible, to loud. Combined with the natural spread in thresholds within a population, it may have the effect that a very low-frequency sound which is inaudible to some people may be loud to others.

One study has suggested that infrasound may cause feelings of awe or fear in humans. It also was suggested that since it is not consciously perceived, it may make people feel vaguely that odd or supernatural events are taking place.[33]

the sinkholes, IMO, are caused by the vast oil/fracking consumption... whenever we take the oil/natural gas, it leaves vast hollow spots underground without the pressure that was once there...

There hasn't been fracking everywhere those sinkholes appeared, like at the Dead Sea. Fracking could cause some sinkholes but not all of them.

true, but sinkholes only form only way - a void/cave below them...

It's interesting the rate at which they appear in the span of a couple of years. One of them is a well defined circle, as if drilled by some unknown means...

yea, that big one in Venezuela, that ate a city block...lol

That's the one... Look how even the wall is.

yea, it seems that circular/round is a universal constant...

Sound waves from the shock of Magma displacement and crust movement can sometimes reverberate in the atmosphere when the electromagnetic field of the earth fluctuates due to poles shift.
Like the man-made global-warming crowd, I'm sticking to that explanation no matter what

sir you are right ... I don't know much about it coz I'm from another country (India) . but I had seen a show on this topic on my favourite TV channel (historytv18) ... the scientists had explained the problem as same as you said . 100+% correct .

I'm not as sure as you are about all that but it's clear our earth hasn't revealed all its secrets.

Things in the world will only get worse then they already are right before the apocalypse....

And i must say all your threads are very interesting & informative