It seems silly to me that you can differentiate between
various types of disturbances in any way except through
frequencies. Even P waves can present themselves
with motion or deformation in almost any direction.
We live at a phase boundary between air and earth
where waves will meet a melodramatic velocity change.
Where P can become S and vice versa.


----- Original Message ----- 
From: "GPayton" 
To: "PSN Network List" 
Sent: Sunday, September 27, 2009 11:14 AM
Subject: Seismometer Siting


> Over and over, I have read that normally a seismometer is sited for N-S, 
> E-W, and Vertical sensing.
> 
> However, I just read a paragraph in An Introduction to Seismology, 
> Earthquakes and Earth Structure about a seismometer in Hawaii that "was 
> oriented to receive S phase signals."  How is that accomplished?
> 
> I could venture a guess, but probably would be wrong.
> 
> Thanks,.
> Jerry Payton 
>
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