I would have to disagree with that Chris

P waves are a longitudinal wave ... its a compressional/dilational wave in 
the direction of travel

 From wikipedial and other sources agree .....

.. The name P-wave stands either for primary wave, as it has the highest 
velocity and is therefore the first to be recorded, or pressure wave,[1] as 
it is formed from alternating compressions and rarefactions.

In isotropic and homogeneous solids, the polarization of P-waves is always 
longitudinal. This means that the particles in the body have vibrations 
along or parallel to the direction of travel of the wave energy.

cheers
Dave



>Hi Bryan,
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>     P waves give a vertical displacement at right angles to the direction 
> of  propagation. Distant quakes are likely to have a
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>     Chris Chapman
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>    Am I correct in assuming that your clocks use a vertical pendulum with 
> a period between 1 and 2 seconds?
>Bryan Mumford




I would have to disagree with that Chris


P waves are a longitudinal wave ... its a compressional/dilational wave
in the direction of travel


 From wikipedial and other sources agree .....


. The name P-wave stands either for primary wave, as
it has the highest velocity and is therefore the first to be recorded, or
pressure wave,[1] as it is
formed from alternating compressions
and rarefactions.


In isotropic and homogeneous solids,
the polarization of P-waves is always
longitudinal. This means that the
particles in the body have vibrations along or parallel to the direction
of travel of the wave energy.


cheers

Dave





Hi
Bryan,



    P waves give a vertical displacement at
right angles to the direction of  propagation. Distant quakes are
likely to have a 



    Chris
Chapman  


 




 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 


 



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

Bryan
Mumford