PSN-L Email List Message

Subject: Re: Seismometer Siting
From: ChrisAtUpw@.......
Date: Tue, 29 Sep 2009 00:19:48 EDT


 
In a message dated 29/09/2009, barry_lotz@............. writes:

Geoff
Along that line, a P wave being a pressure wave  and a s wave being a shear 
wave. It seems that if one could see two  directions simultaneously during 
an event one be able to combine the p  wave vectors and obtain the direction 
of max and min p wave contribution  and thus the approx direction of the  
event.


Hi Barry,
 
    The P wave comes up at quite a steep angle and it  is rather weak, so 
this is not such a good idea. But you have horizontal S waves  which carry 
the direction of propagation very well and are usually much  stronger. Two 
horizontal sensors should work fine.
 
    Regards,
 
    Chris Chapman





In a message dated 29/09/2009, barry_lotz@............. writes:
Geoff
Along that line, a P wave being a pressure= wave=20 and a s wave being a shear wave. It seems that if one could see tw= o=20 directions simultaneously during an event one be able to combine= the p=20 wave vectors and obtain the direction of max and min p wave contri= bution=20 and thus the approx direction of the=20 event.
Hi Barry,
 
    The P wave comes up at quite a steep angle an= d it=20 is rather weak, so this is not such a good idea. But you have horizontal= S waves=20 which carry the direction of propagation very well and are usually much=20 stronger. Two horizontal sensors should work fine.
 
    Regards,
 
    Chris Chapman

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