<p>I'm trying to apply <strong><em>sumigfd</em></strong> on <em>simple.su</em> data which is used in the John Stockwell <a href="http://www.cwp.mines.edu/~john/GPGN461.561/ch1-14.pdf" rel="nofollow">course in geophysical image processing</a> - in the Migration chapter on page 85. I have not had any success because the <em>vfile</em> was not set up well. Even when I created a new <em>vfile</em> the  problem persisits.</p>

<pre><code>surange &lt; simple.su

80 traces:

tracl    1 80 (1 - 80)
cdp      1 80 (1 - 80)
trid     1
ns       501
dt       4000
</code></pre>

<p>After this information I created a <em>vfile</em> using the instructions,</p>

<pre><code> makevel nx=80 nz=501 &gt; cr
 transp &lt; cr n1=80 &gt; ce
</code></pre>

CC BY-SA 3.0
2016-03-01T09:00:42.157Z
Hi Liath, welcome to [ES](http://earthscience.stackexchange.com). At the moment it is very difficult to understand the question. Please refer to the [help center](http://earthscience.stackexchange.com/help) to gain a better understanding of what constitutes a good question on this site in order to increase the chances it gets answered.
Isopycnal Oscillation
CC BY-SA 3.0
2016-03-08T19:02:44.187Z
In addition to following the guidelines from the Earth Science help centre, you can improve your question by including the essential information for any question about software problems, i.e. detailed and unambiguous explanations of (1) what you did, (2) what you expected to happen, and (3) what actually did happen.
Pont
<geophysics>
SeismicUnix - Finite Difference Migration
Liath Fahad
# SeismicUnix - Finite Difference Migration

(Asked by: username_0 on 2016-03-01)

I'm trying to apply ***sumigfd*** on *simple.su* data which is used in the John Stockwell [course in geophysical image processing](http://www.cwp.mines.edu/~john/GPGN461.561/ch1-14.pdf) - in the Migration chapter on page 85. I have not had any success because the *vfile* was not set up well. Even when I created a new *vfile* the problem persisits.

```
surange < simple.su

80 traces:

tracl    1 80 (1 - 80)
cdp      1 80 (1 - 80)
trid     1
ns       501
dt       4000

```

After this information I created a *vfile* using the instructions,

```
 makevel nx=80 nz=501 > cr
 transp < cr n1=80 > ce

```

**Tags:** geophysics

> **Comments:**
> **username_1**: Hi username_0, welcome to [ES](http://earthscience.stackexchange.com). At the moment it is very difficult to understand the question. Please refer to the [help center](http://earthscience.stackexchange.com/help) to gain a better understanding of what constitutes a good question on this site in order to increase the chances it gets answered.  
> **username_2**: In addition to following the guidelines from the Earth Science help centre, you can improve your question by including the essential information for any question about software problems, i.e. detailed and unambiguous explanations of (1) what you did, (2) what you expected to happen, and (3) what actually did happen.  

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## 0 answers

