Hi Erdi -

It looks like you applied a general AGC to your data (beforetopmute.png).  This seems to make amplitudes about equal in the noise before the first breaks and in the real data.  I suggest you first process the data in some way to reduce the amplitudes of the noise before the first breaks.  I have found two simple ways to do this.

One way is to use the "perc" value (perc=99") in suxwigb, but I don't think that helps you because you need the output after applying "perc" and suxwigb is a dead-end process.

The other way is to use sugain with "tpow=2".  If this is effective in diminishing the noise before the first break, I would output those gathers as my second dataset.  With the second dataset, my next step would be, trace-by-trace, search down for some threshold value (basically, the first break), then back up maybe 8 or 10 or 12 ms, then zero all values earlier than that time.  Be sure you don't try to zero amplitudes before zero time (!).

Regards,
David Forel
. . . . . . . . . . . . . .




On Sunday, August 11, 2024 at 03:39:04 PM MDT, Gerhard Diephuis <gdiephuis@xs4all.nl> wrote:


Erdi, good evening

 

In my mind the most logical would be to define an offset dependent top mute. Obviously you are dependent on that particular trace header – just plotting a reasonable number of traces with offset values as horizontal annotations should give an idea whether you can progress in that vein. Otherwise the route becomes cumbersome…….

 

Good luck

 

Gerhard

 

From: Erdi Apatay <eapatay@mtu.edu>
Date: Sunday, 11 August 2024 at 18:03
To: SU-users <seisunix@mailman.seismic-unix.org>
Subject: [Seisunix] Top Mute

 

Hi all!

 

I have real seismic data and I want to apply top mute to this data. Actually, I can apply top mute to shot gathers one by one, but I wanted to create a script that could apply top mute to all of them, but I could not get a good result.

Do I need to create a script that includes a loop to do this properly?

What path should I follow?

 

I would be happy if you could help

Best

Erdi

 

P.S.: I attached a script I wrote ( I tried to do top mute only for the right upper side of the shot gathers for testing), and how they look after applying my script, and output of surange command.

 

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