Dear Massita Putriastuti -
The version of SAC described in the SAC book by Helffrich, Wookey & Bastow (SAC/BRIS, based on the Fortran code base) has features that make this quite simple. There are additional picking features to pick peaks, troughs or zero crossings closest to a reference line drawn with your graphics cursor across a record section plot made with PLOTRECORDSECTION. The picks may be written out and then analyzed as a function of distance to derive a velocity. See Chapter 8 in the book.
On 18 Aug 2015, at 23:08, Massita Putriastuti <massitacindy<at>gmail.com> wrote:
Hai all, sorry to bother but I need your help about how to picking traveltime in PRS result? I already plot my green's function from cross correlation (I'm doing ambient noise analysis) as a multi green's function (using prs) and hoping can get a velocity reference from plotting between distance vs traveltime. I just don't know how to picking it, is there any step for it?? Thank you.
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George Helffrich
george.helffrich<at>bris.ac.uk
Massita Putriastuti
George Helffrich
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