Human beings can detect sounds in the frequency range 20-20,000 Hertz. If a P wave refracts out of the rock surface into the air, and it has a frequency in the audible range, it will be heard as a rumble. Most earthquake waves have a frequency of less than 20 Hz, so the waves themselves are usually not heard. Most of the rumbling noise heard during an earthquake is the building and its contents moving.

http://earthquake.usgs.gov/learn/facts.php

immoderate

(20,885 posts)

5. I should have said "sub-sonic."

Reply to muriel_volestrangler (Reply #4)

Fri Feb 17, 2012, 11:46 AM

Feb 2012

--imm

dmallind

(10,437 posts)

3. Ah the old Siberian Hell drill gag.

Reply to plcdude (Original post)

Thu Feb 16, 2012, 05:11 PM

Feb 2012

Never seem willing to let anybody test it for some reason......

ZombieHorde

(29,047 posts)

6. Mother Earth sometimes enjoys a little Taco Bell. nt

Reply to plcdude (Original post)

Sat Feb 18, 2012, 09:06 PM

Feb 2012

Codeine

(25,586 posts)

7. A thorough grasp of the Seven Layers Theory is essential to understanding plate tectonics.

Reply to ZombieHorde (Reply #6)

Sat Feb 18, 2012, 11:26 PM

Feb 2012

ZombieHorde

(29,047 posts)

8. Funny! nt

Reply to Codeine (Reply #7)

Sun Feb 19, 2012, 02:21 PM

Feb 2012

laconicsax

(14,860 posts)

9. It's posts like this that make me glad I didn't lock this thread.

Reply to Codeine (Reply #7)

Sun Feb 19, 2012, 05:32 PM

Feb 2012

Ter

(4,281 posts)

10. The "Hollow Earth Theory" is gaining lots of ground

Reply to plcdude (Original post)

Wed Feb 22, 2012, 01:11 AM

Feb 2012

No longer are we who believe kooks and nuts.

laconicsax

(14,860 posts)

11. Nope. Hollow-earthers are still kooks and nuts.

Reply to Ter (Reply #10)

Wed Feb 22, 2012, 01:37 AM

Feb 2012

If you'd like to present your evidence for a hollow earth, you're welcome to do so. Keep in mind that it won't be accepted uncritically.

Codeine

(25,586 posts)

13. Gaining ground with kooks and nuts, at least.

Reply to Ter (Reply #10)

Tue Feb 28, 2012, 09:16 PM

Feb 2012

Nobody with an ounce of sense buys into such baloney.

Humanist_Activist

(7,670 posts)

12. I imagine the Earth is creating a lot of sound, just we can't detect most of it...

Reply to plcdude (Original post)

Mon Feb 27, 2012, 03:28 PM

Feb 2012

at least not without a lot of effort. The interaction between the outer and inner core probably produces a lot of noise, being that the outer core is flowing around the inner core. The Mantle would be churning, slowly but surely, as a semi-solid fluid of sorts, that would create a lot of noise, then you have the crust, broken into plates that grind against each other constantly, which creates a lot of noise we do detect.

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