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Originally posted by ISis12RA12ELohim
reply to post by nitro67
WOW that is JUST like it, it even caused a bit of fear in my heart listening to it again, because it took me back to bracing for impact, I had to shut it off, I guess these sounds, whatever they are, will take some getting used to, its something I don't understand so naturally I feared it, but doesn't mean its cause for fear, Just took me by surprise when I heard it, and well you know, living in the DC Metro area you know there is a possibility that one of these days you might just wake up dead lol. There are so many people who want to nuke us, and for good reason although there is no reason to nuke anyone at all ever.
There was an abnormal sort of whistling sound to it too I think.edit on 9/13/2011 by ISis12RA12ELohim because: (no reason given)
Earthquakes can be heard coming
They can create very loud rumbles
I can tell you that a big boom before a quake, sometimes accompanying it depending on where the epicentre was in terms of your location, is nothing unusual.
The propagation velocity of the waves depends on density and elasticity of the medium. Velocity tends to increase with depth, and ranges from approximately 2 to 8 km/s in the Earth's crust up to 13 km/s in the deep mantle.
What interests me about both of these statements is that they say the sounds can be heard BEFORE the earthquakes. Considering how sharp the onset of an earthquake is in terms of the seismic signature I am wondering how this can be. Could, dependent on the distance from the epicentre, the 'sound' of the earth moving reach you before the S wave gets there? Somehow I doubt it as the shock waves from an earthquake move at several km/s
"Something entirely new to us is causing this hum. Its frequency suggests something is 'twisting' the surface of the crust."
Although these tones are all around us, their pitch is too low for the human ear, typically 100-5000 microHertz (1 microHertz corresponds to 1 vibration every 278 hours)