PSN-L Email List Message

Subject: Re: New WinQuake Beta Releand and Re: Winquake 2.9.4
From: hammond hammond@...........
Date: Thu, 13 Mar 2003 17:46:52 -0900

Hi Chris,

I haven't calculated it but it looks to be from 0.1 - 0.4 seconds for the 5 
Hz low pass 6-pole filter.  I don't pick phase arrivals using filtered 
data.  Even so, your implied point is well taken.  And Larry's comment is 
very valid:  the JB tables don't support arrivals any more accurately than 
0.1 seconds.

I was thinking (always dangerous) that I would like to measure phase 
arrivals as accurately as possible given that I have a very accurate GPS 
clock (better than +/- 100 ms), fast digitizer in a fast PC, etc.


>Hi Bob,
>       Just out of interest, what is the phase delay for P & S waves on 
> the multipole filters that you are using?
>       Regards,
>       Chris Chapman


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