PSN-L Email List Message

Subject: Re: Re:P-waves
From: Geoffrey gmvoeth@...........
Date: Fri, 25 Mar 2011 13:37:16 +0000

If you could send a signal through the wave at right angles to it (normal to it) you should see
the density changes as small variations in sound velocity or
overall temperature changes.
These waves represent stress and strain in action.
Like the stress and strains causing EQs.

-----Original Message----- 
From: Dave Nelson 
Sent: Thursday, March 24, 2011 7:57 PM 
To: psnlist@.............. 
Subject: Re:P-waves 

Found what I was looking for ,,,,,  a animation of a P wave

notice there is NO vertical motion, it is totally longitudinal
P waves travel like sound waves do  :)


   Am I correct in assuming that your clocks use a vertical pendulum with a period between 1 and 2 seconds? 
Bryan Mumford

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