Hi Elora -

About your frequency and amplitude selections in sufilter -- your "amps" values mean you have a high-pass filter but your "f" values mean you are limiting your frequencies to 10-20 hz (I think).  This is low resolution.

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



On Thursday, April 13, 2023 at 11:26:20 AM MDT, Elora Afrin <elora.afrin@students.tamuk.edu> wrote:


Hello,

Here, I have attached the filters and commands I am using and the image I got. Please have a look. After putting j=636 and key=offset max= 1272, the image became noisy. The total length of the line is around 126 km. I am working on last 200 shots that is last 56km. I need to label the x axis to distance in km and y axis to twt in s. I need to increase the resolution and point out the BSRs and faults in the last 56 km. Please help me out.

Thanks.

Sincerely,
Elora
From: Glenn Reynolds <gdreynolds@gmail.com>
Sent: Thursday, April 13, 2023 12:00:29 PM
To: Elora Afrin <elora.afrin@students.tamuk.edu>
Cc: David Forel <davidforel@yahoo.com>; seismic unix <seisunix@mailman.seismic-unix.org>
Subject: Re: [Seisunix] Re: Help with Plotting twt vs distance plot
 
Change j to 636. 

The offset range from surange doesn't make sense.  It should be 264 to 264 + 12.5 x 635, ie about 8200 metres.

What filter setting did you use?  How long was the original data? 

Use suwind to get 1272 traces and plot. You should see 2 shots. Is this correct?




On Thu, 13 Apr 2023, 14:13 Elora Afrin, <elora.afrin@students.tamuk.edu> wrote:
Hello,

Thank you so much for your time and help. Here I attached the surange information. I tried using key= tracl min =1 max=636 but got the same image. Here I attached the image of the data range and the image I got.

Thanks.

Sincerely,
Elora

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From: David Forel <davidforel@yahoo.com>
Sent: Tuesday, April 11, 2023 7:10:57 PM
To: Elora Afrin <elora.afrin@students.tamuk.edu>; Glenn Reynolds <gdreynolds@gmail.com>
Cc: seismic unix <seisunix@mailman.seismic-unix.org>
Subject: Re: [Seisunix] Re: Help with Plotting twt vs distance plot
 
Hi Elora -

Riding on the back of Glenn's message, please know that, in addition to selecting time (tmin, tmax), suwind can select traces, too:

key=tracl Key header word to window on (see segy.h)
min=LONG_MIN min value of key header word to pass
max=LONG_MAX max value of key header word to pass

Use surange to get the overall picture of your trace keys and use sugethw or sudumptrace to get details of specific keys.

Also, Excel or LibreOffice Calc could be used for quick plots after extracting columns from your .su files.

You might post the output from surange so we might give more informed advice.

David

. . . . . . . . . . . . . .



On Tuesday, April 11, 2023 at 12:50:29 PM MDT, Glenn Reynolds <gdreynolds@gmail.com> wrote:


Use surange to get the range of headers.

Then use key and min keywords to limit the traces.

Also check your filter settings.  Should amps be 0,1,1,0 instead perhaps?
 

gdr

On Tue, 11 Apr 2023, 21:02 Elora Afrin, <elora.afrin@students.tamuk.edu> wrote:
Hi,
Greetings! I am working on marine multichannel seismic data. To see structural features, I need to plot twt vs distance plot for last 56 km of the line. It is a very long line and I want to observe only the feaures of last 56 km. However, I am struggling a lot to set x axis values. I typed 
suwind < 5thshot.su tmin=0 tmax=4 j=600 | sugain jon=5 | sufilter f=0,5,10,20 amps=0.,0.,1.,1., | supsimage perc=99 > 5th.ps

It has given me the image of th whole line. Whereasm I am expecting an image like the image I have attached. Please help me out with making such an image. Thanks.
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