[SAC-HELP] Fwd: Phase picking

[Abhash Kumar]

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> From: akumar <abhash.kumar84 at gmail.com>
> Date: September 23, 2011 4:27:08 PM EDT
> To: sac-help at iris.washington.edu
> Subject: Phase picking
> 

> Hi,
>     I am using SAC to pick events on vertical component and then using rot command to rotate east and north to radial and transverse. I have picked P-wave arrival on vertical component and it has generated a time marker at 305.45 seconds from the reference time. For S-wave, I have used transverse component and the time marker is at 269.67 seconds, which is less than P-wave arrival time. I looked into header file and it says that B value for vertical component is 0.00second but for transverse it is -67.00 seconds and adding this time to S-wave time marker gives time of 336.67 seconds, which is more than P-wave arrival time. I was wondering, do I need to add this B value to the S-wave time marker in the header file, otherwise when I will be extracting the data at later stage then it will show the discrepancy of S-wave travel time less than P-wave travel time. I would really appreciate any kind of suggestion.
> 
> Thanks
> Abhash Kumar
> University of North Carolina at chapel hill
> NC
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