<html><body bgcolor="#FFFFFF"><div><br><br>Sent from my iPhone</div><div><br>Begin forwarded message:<br><br></div><blockquote type="cite"><div><b>From:</b> akumar <<a href="mailto:abhash.kumar84@gmail.com">abhash.kumar84@gmail.com</a>><br><b>Date:</b> September 23, 2011 4:27:08 PM EDT<br><b>To:</b> <a href="mailto:sac-help@iris.washington.edu"><a href="mailto:sac-help@iris.washington.edu">sac-help@iris.washington.edu</a></a><br><b>Subject:</b> <b>Phase picking</b><br><br></div></blockquote><div></div><blockquote type="cite"><div><span>Hi,</span><br><span> 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.</span><br><span></span><br><span>Thanks</span><br><span>Abhash Kumar</span><br><span>University of North Carolina at chapel hill</span><br><span>NC</span></div></blockquote></body></html>