[Seisunix] Zero Offset VSP Processing
r.w.hobbs at durham.ac.uk
Thu Aug 6 12:11:31 CEST 2020
I agree with the previous posts, in particular you should be picking the
maximum value maybe sumax can help with this. I also recommend you
resample at a higher sample frequency - suggest suresamp rf=4, if you
want to get a better estimate of the peak times.
On 05/08/2020 20:21, Erdi Apatay wrote:
> Hello Everyone
> I said before that I was trying to do Zero Offset VSP Processing. To do
> that, I tried to use free software is called MVSP and Crewes toolbox. My
> problem is that I can start picking first break arrivals from 4th trace,
> and I can not see and pick the first three traces when I look at the
> data during the picking.
> The first softwareÂ itself assigns negative values for the first three
> traces, which results in negative velocities. On the Crewes, I am trying
> to assign values like 0.001 0.002 0.003 before the 4th trace because the
> 4th trace's time is 0.006, which probably gives rise to wrong velocities.
> In short, Can I do anything about this issue on Seismic Unix? Is there
> any chance to fix it?
> I added one of my files and the screenshot zoomed where the problem is.
> I modeled and created this data on different code (fdelmodc). **The data
> is passive data, and I utilized the noises, recording 120s. So, when you
> look at my data, you need to zoom in to see closely.
> Thank you
> Best regards
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