NOTE Of INTEREST:
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
http://www.geo.mtu.edu/UPSeis/images/P-wave_animation.gif

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

cheers
Dave



















































































   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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