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Originally posted by wasobservingquietly
No earthquakes for a few hours now. But look at PuterMan's Virginia seismo! Something is up!!!
Originally posted by summer5
reply to post by PuterMan
Here are two different sounds (being reported all over the world - not always followed by a significant quake). Here are two video's I found this morning regarding the quake in CO, and the following day in VA. Both were heard prior to the quakes.
Here is the one in VA:
And the one in CO.
What say you PM?
Originally posted by PuterMan
reply to post by MoorfNZ
The plains are gravel, if that makes a difference to the way sound is generated etc.
I would say that was a yes.
The rumble we hear (it's very very distinguishable from any other potential noise, sounds like nothing on earth) is very very low resonance, you can almost 'feel' it as well as hear it. It is eerie. It's strange because it's so low you feel you ought not to be able to hear it, yet it's very audible (if that makes sense) yet it's not LOUD... but all around you.
In relation to the paragraph below about the sharp ones, are these always subsequently traceable to a smaller quake?
The LOUD noises, more like jets, arrive with the movement. Particularly the 7.1 (about 12km from me) which when it hit sounded like several large jumbo jets landing in the garden, and continued for a good 40 secs with the movement.
I would imagine that the sounds that arrive with the shaking at resultant upon the rending/movement of the ground and not with the P waves.
Sometimes booming will be heard with NO movement. This type of boom is different - short and sharp like an explosion. I've experienced this too, as have many I know. These are weird ones because you brace yourself but nothing comes. I've noticed these are often v. shallow and close by and small quakes (sub 2.5). This was the case the day before the 7.1 where residents near the epicentre (which is also fairly need a small Army shooting/bomb practice range) had rung the Police after hearing booming to check it was the range. It wasn't. Next day the 7.1 hit.
The proximity may be a clue here. I am thinking speed of the seismic waves. These are belting out from the hypocentre at huge rates - up to 11km a second. That is supersonic, hell no it is even way above hypersonic.
I am not the best at maths so someone please haul me up if am an in error here.
Seismic waves:
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.
That is per second please note. Even the slowest at 2km/second is 7,200 km/hr. The 11 km/s ones are 39,600 km an hour
39,600 Kilometers per Hour = 24,606.23 Miles per Hour. That is truly hypersonic and faster than escape velocity or re-entry speeds. I make that Mach 32
Yes, Mach 32!
There must be barrel loads of vibrations coming off that and yes this is undoubtedly where topography plays a part. Any formation that acts as say a venturi on these frequencies would speed them up - I am hypothesising here - and probably raise them into audible levels. (Rock formations do deflect seismic waves even though they can travel through them). Most people can hear 100 Hz, not many hear below that. But you can feel vibrations down as low as 14 Hz - the one which can kill you if sustained. I have sat and watch a bass speaker playing 17 Hz as an experiment in science at school. Oh yes you really could feel it. (I think it was the same teacher that allowed us to make TNT and gunpowder! Who says school was not fun?)
But I am still curious as to why this seems to be recent so await input from StealthyKat. Perhaps with more info we can figure this thing out.
edit on 20/9/2011 by PuterMan because: (no reason given)
By the way, no comments anyone on seismic waves travelling up to Mach 32? I thought that was quite significant.
If I had a clue what that actually meant, I might find it interesting
Originally posted by PuterMan
reply to post by summer5
If I had a clue what that actually meant, I might find it interesting
32 x the speed of sound. Faster than a speeding bullet. Faster than a spaceship lifting off and escaping the earth's gravity. Think of a sonic boom at Mach 1 = 1 x times the speed of sound.
These waves travel 32 times faster than that. Over 10 times faster then the fastest fighter jet in the world (known to mere sheeple like us)
That HAS to have some effect. It makes this look like a snail. It is only Mach 20.
I know it is a wave and not an object but surely you cannot have waves that can move the earth up and down and side to side and that travel at those speeds that have no sonic output?
edit on 20/9/2011 by PuterMan because: (no reason given)
It starts a 172 Hz. but goes right up to 4000 Hz. The bands of frequency come down fairly rapidly in harmonic divisions (roughly) down to 172. The slice I analysed was right in the middle of the sound covering about 2.5 seconds
The bangs are very different. VERY sharp completely flat front wave like a nearby rifle shot. Frequency range of this one is 43Hz to 131 Hz
Originally posted by summer5
reply to post by MoorfNZ
HMMM....now I find that VERY interesting! I wish I could hear the difference of what you have heard in comparison to what others have heard via these vids (as example).
Originally posted by SpaceJockey1
Can you believe that people make up stories like the following to instill FEAR:
"The next allignment between Elenin, Sun and Earth will be Sept 26th 2011. According to "Alexander Retrov", the whole pacific rim will go. There will be mag 12 to 15 earthquakes. New Zealand, Japan, Indonesia, China, Korea, Russia, West coast of America, will disappear.
"The East coast of Australia will be affected by tidal waves. A cosmic sonic shockwave will blow out our protective van Allen belts and magnetic fields and will leave the planet totally open to gamma radiation. We will be fried alive like vampires in the sunlight. There will be an electomagnetic pulse that destroys all electronics. Surface temperatures will be 60+ degrees Celsius. There will be 1000km/hr winds. There will be an eclipse that lasts for 3 days. There will be volcanic eruptions everywhere, pyroclastic blasts and acid rain from all the ash. There will be wildfires everywhere..."
So much BS in there that it's hard to comprehend that anyone would believe it...but there will beedit on 20-9-2011 by SpaceJockey1 because: spelling