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Seismic data with micro-seconds sampling interval
by nickag64759＠gmail.com 26 Jun '23

26 Jun '23

Dear Sirs, I have a seismic data sampled at micro-seconds. I load 3 files with : segyread tape=mySegy.sgy > mySegy.su Then I used: surange < mySegy.su As you can see in the attached log files, the one called box31.log contains "strange" d1 and f1 values. Please could you help me to understand why d1 and f1 are so big ? The only one significant difference is that an01 and an31 are sampled at 33 micro-seconds while box31 is at 124 micro-seconds. Thanks Giulia

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Missing X11 env
by nickag64759＠gmail.com 14 Jun '23

14 Jun '23

Hello, I am trying to install the xt package un my Ubuntu 22.4 env but the X11 env is missing. I try to install: sudo apt install libx11-dev but I do not find any X11 package installed. Who can help me ? Thanks a lot. Giulia Da: Elora Afrin <elora.afrin(a)students.tamuk.edu> Inviato: martedì 13 giugno 2023 02:03 A: David Forel <davidforel(a)yahoo.com> Cc: seisunix(a)mailman.seismic-unix.org Oggetto: [Seisunix] Re: Help with getting headerword Hello, Thank you so much for your consideration. I attached the screenshot what I got adding key1=sy. I also attached the range of my original file where sy is missing. I don’t have access to my computer right now, so I just attached the screenshot from my phone, I apologize for that. Thanks. I am looking forward to hearing from you. Sincerely, Elora Get Outlook for iOS <https://aka.ms/o0ukef> _____ From: David Forel <davidforel(a)yahoo.com <mailto:davidforel@yahoo.com> > Sent: Monday, June 12, 2023 6:47:54 PM To: Elora Afrin <elora.afrin(a)students.tamuk.edu <mailto:elora.afrin@students.tamuk.edu> > Cc: seisunix(a)mailman.seismic-unix.org <mailto:seisunix@mailman.seismic-unix.org> <seisunix(a)mailman.seismic-unix.org <mailto:seisunix@mailman.seismic-unix.org> > Subject: Re: [Seisunix] Help with getting headerword Hi Elora - It might help us to see the output of surange. David Sent from my cell phone. On Jun 12, 2023, at 4:41 PM, Elora Afrin <elora.afrin(a)students.tamuk.edu <mailto:elora.afrin@students.tamuk.edu> > wrote: Hello Everyone, Greetings. I have a su file where sy header is missing. How can I set a correcect sy values? I went through sushw and suchw and saw some basic information. I tried Key1=sy, key2=sx and key3=gx but noticed that I got gy values but gx and gy are same which is not supposed to be. I do not know the first value of gy. I request you to help me to set gy values. Thank you. Sincerely, Elora _______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org <mailto:seisunix@mailman.seismic-unix.org> To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org <mailto:seisunix-leave@mailman.seismic-unix.org>

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Re: Help with getting headerword
by Gerhard Diephuis 13 Jun '23

13 Jun '23

Elora, I am rather amazed about your question. The sushw program is very versatile in generating traceheaders for complicated geometry as well as using values from a textfile for traceheaders. If you have the values for sy in a simple textfile in one column, try a2b < your_text_file n1=1 > binary_file, followed by sushw < your_su_file infile=binary_file key=sx > your_amended_su_file. Check results by applying sugethw < your_amended_su_file key=sx,sy,gx,gy output=geom > resulting_header_file.txt. That shoud result in a four-column text file Good luck Gerhard From: Elora Afrin <elora.afrin(a)students.tamuk.edu> Date: Tuesday, 13 June 2023 at 00:41 To: SU-users <seisunix(a)mailman.seismic-unix.org> Subject: [Seisunix] Help with getting headerword Hello Everyone, Greetings. I have a su file where sy header is missing. How can I set a correcect sy values? I went through sushw and suchw and saw some basic information. I tried Key1=sy, key2=sx and key3=gx but noticed that I got gy values but gx and gy are same which is not supposed to be. I do not know the first value of gy. I request you to help me to set gy values. Thank you. Sincerely, Elora _______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org

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Help with getting headerword
by Elora Afrin 12 Jun '23

12 Jun '23

Hello Everyone, Greetings. I have a su file where sy header is missing. How can I set a correcect sy values? I went through sushw and suchw and saw some basic information. I tried Key1=sy, key2=sx and key3=gx but noticed that I got gy values but gx and gy are same which is not supposed to be. I do not know the first value of gy. I request you to help me to set gy values. Thank you. Sincerely, Elora

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Help with Stacking
by Elora Afrin 31 May '23

31 May '23

Hello, Greetings! I am a very beginner. I have a su file. I need to mark BSRs, faults and other features of a certain portion of a long marine seismic line. I want to stack the data. Would you please help me how can I stack the data. What codes should I use? Thanks. Sincerely, Elora Afrin Get Outlook for iOS<https://aka.ms/o0ukef>

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Help with Creating a PS Image File
by Elora Afrin 10 May '23

10 May '23

Hello, Greetings. I ran this command and got a satisfied image using suximage. suwind<b.su<http://b.su/> key=offset min=70000 tmax=4|suximage perc=98 f2=70.151 d2=.250 hbox=900 wbox=1500 label2="Distance Along Line (km)" label1="Two-way Time (s)" & However,I want to create a ps file and download the image. I tried to ran similar command using supsimage but could not ran the commands. Please help me with this. Thanks in advance. Sincerely, Elora

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Help with Plotting twt vs distance plot
by Elora Afrin 13 Apr '23

13 Apr '23

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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Re: Help with Plotting twt vs distance plot
by David Forel 13 Apr '23

13 Apr '23

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(a)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 Get Outlook for iOSFrom: Glenn Reynolds <gdreynolds(a)gmail.com> Sent: Thursday, April 13, 2023 12:00:29 PM To: Elora Afrin <elora.afrin(a)students.tamuk.edu> Cc: David Forel <davidforel(a)yahoo.com>; seismic unix <seisunix(a)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(a)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 Get Outlook for iOSFrom: David Forel <davidforel(a)yahoo.com> Sent: Tuesday, April 11, 2023 7:10:57 PM To: Elora Afrin <elora.afrin(a)students.tamuk.edu>; Glenn Reynolds <gdreynolds(a)gmail.com> Cc: seismic unix <seisunix(a)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(a)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(a)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._______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org _______________________________________________ Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org

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Re: Help with Plotting twt vs distance plot
by Glenn Reynolds 13 Apr '23

13 Apr '23

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(a)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 > > Get Outlook for iOS <https://aka.ms/o0ukef> > ------------------------------ > *From:* David Forel <davidforel(a)yahoo.com> > *Sent:* Tuesday, April 11, 2023 7:10:57 PM > *To:* Elora Afrin <elora.afrin(a)students.tamuk.edu>; Glenn Reynolds < > gdreynolds(a)gmail.com> > *Cc:* seismic unix <seisunix(a)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(a)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(a)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. > _______________________________________________ > Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org > To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org > > _______________________________________________ > Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org > To unsubscribe send an email to seisunix-leave(a)mailman.seismic-unix.org >

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Re: Problems with sucdpbin
by Dominique ROUSSET 07 Apr '23

07 Apr '23

Hi, good... but not yet very good ! I suspect a problem of numerical accuracy with such high values of X and Y coordinates. You can test this hypothesis by subtracting the mean of X and Y coordinates to have 0 centered data... If it's true, it should be better to correct the algorithm, I know... D. Le 07/04/2023 à 08:41, JUAN LORENZO DIAZ NAVEAS a écrit : > Dear Glenn and Dominique, > > Thanks a lot for your help. Indeed the keyword scalco=-10000 was > guilty for scaling sx,sy,gx and gy coordinates. So now I am able to > produce an su file with cdp headers. > > But now unfortunately I found another problem. The su file with cdp > headers has about 66% of cdp=0. The cdp=0 traces are at the > "beginning" of the su file. > > And the intriguing aspect is that I have a crooked line with 10 > points. See the attached map. There the black dots are the source > coordinates, the red dots are the receiver coordinates and the green > circles are the points of the crooked line. > > As you can guess I smoothed both the source and receiver coordinates > using the GMT trend1d command. > > The command line for my binning looks like this: > > *sucdpbin > xline=723193.2,744776.011111,766358.822222,787941.633333,809524.444444,831107.255556,852690.066667,874272.877778,895855.688889,920934 > \ > yline=7242472.4,7242099.3532,7241693.29184,7241254.1793,7240782.11164,7240277.08676,7239739.07882,7239168.07407,7238564.07513,7237820 > \ > < SO104-17_geom.su verbose=2 dcdp=25 cdpmin=1 distmax=100 > > SO104-17_geom-cmp.su > * > > See below the ranges of the file SO104-17_geom-cmp.su and the > attached log file with the verbosity of the sucdpbin command. > > I tried also with distmax less than 100m, the smallest value being > 15m, but the result was similar. > > Any idea on what is going on? > > Best wishes > > Juan Díaz Naveas > ------------------------------------------------------------------- > Juan Diaz Naveas (Dr. rer. nat.) > Escuela de Ciencias del Mar www.cienciasdelmar.pucv.cl > <http://www.cienciasdelmar.pucv.cl> > Pontificia Universidad Catolica de Valparaiso Tel.: +56-32-2274269 > Avenida Universidad 330, Curauma Cel.: +56-9-91630936 > Valparaiso, CHILE E-Mail: juan.diaz(a)pucv.cl > ------------------------------------------------------------------- > *466560 traces: > tracl 1 513204 (1 - 513204) > tracr 1 513204 (1 - 513204) > fldr 1 3888 (1 - 3888) > tracf 1 120 (1 - 120) > ep 1 3888 (1 - 3888) > cdp 0 2572 (0 - 14) > trid 1 > nhs 1 > offset 413 3388 (3388 - 413) > scalel -10000 > scalco 1 > sx 723302 917547 (917547 - 723302) > sy 7237924 7242471 (7237924 - 7242471) > gx 723715 920934 (920934 - 723715) > gy 7237823 7242464 (7237823 - 7242464) > counit 1 > ns 3585 > dt 4000 > gain 9 > afilf 102 > afils 209 > lcf 3 > hcf 102 > lcs 6 > hcs 209 > year 1995 > > Shot coordinate limits: > North(723302,7.24247e+06) South(917547,7.23792e+06) > East(917547,7.23792e+06) West(723302,7.24247e+06) > > Receiver coordinate limits: > North(723740,7.24246e+06) South(920934,7.23782e+06) > East(920934,7.23782e+06) West(723715,7.24246e+06) > > Midpoint coordinate limits: > North(723521,7.24247e+06) South(919240,7.23787e+06) > East(919240,7.23787e+06) West(723508,7.24247e+06)* > > El jue, 6 abr 2023 a las 3:10, Dominique ROUSSET > (<dominique.rousset(a)univ-pau.fr>) escribió: > > Hi Juan, > > after a quick look at sucdpbin.c, i note that this tools honors > the scalco keyword. So, since your data bear a -10000 scalco, you > have to divide xline and yline parameters by 10000 to work with > actual units, not with sx and sy units. > > Let me know it it works > Good luck ! > > D. > > Le 06/04/2023 à 02:47, JUAN LORENZO DIAZ NAVEAS a écrit : >> Dear SU users, >> >> I am trying to make the CMP binning of a seismic line (see the >> headers ranges below). >> >> The command line is: >> >> *sucdpbin < so104-17_geom.su <http://so104-17_geom.su> >> xline=723715,920883 yline=7242464,7237825 verbose=2 dcdp=25 >> distmax=500 > so104-17_cdp.su <http://so104-17_cdp.su>* >> >> As you see I have used a distmax of 500m and still I am not able >> to get the binning. >> >> Just in case I also tried again the same command, but sorting the >> date so that the first traces in the su file correspond to the >> minimum x coordinate and the last traces to the maximum >> coordinate (in the field the line was shot from east to west), >> but it failed as well. >> >> Any help would be very much appreciated. >> >> Best wishes >> >> Juan >> >> *466560 traces: >> tracl 1 513204 (1 - 513204) >> tracr 1 513204 (1 - 513204) >> fldr 1 3888 (1 - 3888) >> tracf 1 120 (1 - 120) >> ep 1 3888 (1 - 3888) >> trid 1 >> nhs 1 >> offset 413 3388 (3388 - 413) >> scalel -10000 >> scalco -10000 >> sx 723302 917547 (917547 - 723302) >> sy 7237924 7242471 (7237924 - 7242471) >> gx 723715 920934 (920934 - 723715) >> gy 7237823 7242464 (7237823 - 7242464) >> counit 1 >> ns 3585 >> dt 4000 >> gain 9 >> afilf 102 >> afils 209 >> lcf 3 >> hcf 102 >> lcs 6 >> hcs 209 >> year 1995 >> >> Shot coordinate limits: >> North(-91.7547,-723.792) South(-72.3302,-724.247) >> East(-72.3302,-724.247) West(-91.7547,-723.792) >> >> Receiver coordinate limits: >> North(-92.0934,-723.782) South(-72.374,-724.246) >> East(-72.3715,-724.246) West(-92.0934,-723.782) >> >> Midpoint coordinate limits: >> North(-91.924,-723.787) South(-72.3521,-724.247) >> East(-72.3509,-724.247) West(-91.924,-723.787)* >> ------------------------------------------------------------------- >> Juan Diaz Naveas (Dr. rer. nat.) >> Escuela de Ciencias del Mar www.cienciasdelmar.pucv.cl >> <http://www.cienciasdelmar.pucv.cl> >> Pontificia Universidad Catolica de Valparaiso Tel.: +56-32-2274269 >> Avenida Universidad 330, Curauma Cel.: +56-9-91630936 >> Valparaiso, CHILE E-Mail: juan.diaz(a)pucv.cl >> ------------------------------------------------------------------- >> >> _______________________________________________ >> Seisunix mailing list --seisunix(a)mailman.seismic-unix.org >> To unsubscribe send an email toseisunix-leave(a)mailman.seismic-unix.org > > -- > |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| > |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| > |mailto:dominique.rousset@univ-pau.fr <mailto:dominique.rousset@univ-pau.fr> http://lfc.univ-pau.fr| > | Off: +33 559 407 423 Cell: +33 660 861 391 | > > _______________________________________________ > Seisunix mailing list -- seisunix(a)mailman.seismic-unix.org > To unsubscribe send an email to > seisunix-leave(a)mailman.seismic-unix.org > > > _______________________________________________ > Seisunix mailing list --seisunix(a)mailman.seismic-unix.org > To unsubscribe send an email toseisunix-leave(a)mailman.seismic-unix.org -- |Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences| |Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France| |mailto:dominique.rousset@univ-pau.fr http://lfc.univ-pau.fr| | Off: +33 559 407 423 Cell: +33 660 861 391 |

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