Seismic Unix Help-Seismic data Processing

[ranjeet]

Hello All,
I have downloaded a data "data2013.su" from http://www.nssic.org/Temp/Data.html. when i used suximage or suxwigb to plot the data, we get some error as:

suximage: fgettr.c: bad first header

suxwigb: fgettr.c: on trace #1, number of samples in header (39756) differs from number for first trace (56581)

How to solve this.i am a very beginner.

thanks in advance.

[ganlen]

Can you show the exact command line(s) you use?

[ranjeet]

Hello Ganlen, thanks 4 replying.
I used only these two command:
suxwigb<data2013.su

suximage<data2013.su

[Gery]

try:

suoldtonew < data2013.su | suxwigb &
suoldtonew < data2013.su | suximage &

[ranjeet]

Thanks Gery,

Now it works.but we also get:
suoldtonew: converted 735 traces to XDR format.

what is this? we need data in su format,that i have already.
Why earlier it was not working? Can explain it?

can you tell me step to correct the headers.

[Gery]

Thanks Gery,

Now it works.but we also get:
suoldtonew: converted 735 traces to XDR format.

what is this? we need data in su format,that i have already.
Why earlier it was not working? Can explain it?

can you tell me step to correct the headers.

you're welcome ranjeet, to your questions:

1. as far as I know, XDR stuff is related to the fact that SU is not an exchange format, for that SEG-Y is the right format. So one SU file which has been read and stored in one place (eg., your laptop) will have something that is not readable in other ones (eg., my laptop). I don't know the correct technical definition for this problem, though. So "suoldtonew" was developed to solve this problem, and hence those data should be the same in both laptops.
2. Well, it wasn't working because SU format is not an exchange format, but SEG-Y. So every SU file you have it should be put as SEG-Y with:
segyhdrs < your-su-file
segywrite < your-su-file tape=your-su-file.segy
3. to read the data (ie, what is in the header) you need:
suoldtonew < data2013.su | surange
or simply:
suoldtonew < data2013.su > newdata2013.su
surange < newdata2013.su
or even better (for traces and cmp positions):
sugethw < newdata2013.su key=tracl,cdp | less

write simply "sugethw" in your terminal for more options, the same applies for the other SU commands.

Hope this helps,

[ranjeet]

Thank you very much Gery ! Now i understood. and i have made new data using this: suoldtonew < data2013.su >data2013-1.su and now it(new one) works fine.

[Gery]

Glad to hear that it helped you, enjoy playing with it and learning!

[EltonM]

try:

suoldtonew < data2013.su | suxwigb &
suoldtonew < data2013.su | suximage &

This worked perfect thanks Gery.

[Gery]

try:

suoldtonew < data2013.su | suxwigb &
suoldtonew < data2013.su | suximage &

This worked perfect thanks Gery.

you're welcome EltonM!

[hamyamys]

Thanks Gery,

Now it works.but we also get:
suoldtonew: converted 735 traces to XDR format.

what is this? we need data in su format,that i have already.
Why earlier it was not working? Can explain it?

can you tell me step to correct the headers.

All of these are not terminated with those format

[Nightwolf]

Hello Guys

Is there anyone who wants to share his crosscorrelation and sort scripts ? I did but I may have made mistake(s) somewhere. I am trying to model my synthetic data and process through ambient seismic interferometry.

I will appreciate if you'd like to share


Thanx