[Seisunix] Zero Offset VSP help

Ty Collins ty-collins at hotmail.com
Tue Aug 25 14:35:39 CEST 2020

Anyone use SU to pick the first breaks and to review Stacking Velocity? Can it be done in SU? I usually get data sorted then migrate into a 3rd party software to determine stacking velocity. Anyone doing this is SU?

From: Seisunix <seisunix-bounces at mailman.seismic-unix.org> on behalf of Dominique ROUSSET <dominique.rousset at univ-pau.fr>
Sent: Tuesday, August 25, 2020 2:50 AM
To: seisunix at mailman.seismic-unix.org <seisunix at mailman.seismic-unix.org>
Subject: Re: [Seisunix] Zero Offset VSP help

just a few suggestions :
- check the output data for each step to find where it fails.
- print the FK amplitude spectrum to check your filter parameters (why do you use 3 parameters for the filter ? slopes=-something,+something amps=0,1 should be ok to keep positive slopes. Before and after FK filtering.
- use suxwigb key=gelev (or the parameter describing geophone depth) to produce well labeled plots of the seismic data in T-Z domain instead of suximage
- I prefer to pick the first breaks before FK (or zero phase F) filtering

Hope it helps


Le 25/08/2020 à 01:35, Erdi Apatay a écrit :
Hello All

I have a script I am using for Zero Offset VSP processing. First of all, my first three traces looked cut so I rejected them. After getting rejected file, I filtered out the downgoing wavefield by sudipfilt. Then, I picked arrivals on the zero amplitude line corresponding to picking amplitudes. Then, I converted those arrival times (seconds) to milliseconds and saving them in a txt.file. After that, txt file is converted from ascii to binary format. Finally, I am adding those time values to the traces by sustatic command.
At this point, however, when I try to plot the flattened upgoings, the script plots just a so narrow part as follows:

Can you help me with this issue? I tried to change a lot of things but I could not get whole flattened upgoings.

 If you would like to check my script, I added here.

Thank you

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|Dominique Rousset           LFCR UMR5150 / E2S UPPA / Dpt des géosciences|
|Univ. Pau et des Pays de l'Adour BP 1155       F-64013 Pau Cedex - France|
|mailto:dominique.rousset at univ-pau.fr jami:drousset http://lfc.univ-pau.fr|
|Off: +33 559 407 423|Cell: +33 660 861 391|xmpp: dominique at rousset.nom.fr|<mailto:dominique at rousset.nom.fr|>
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