The OYO tape output is SEG-D, not SEG-Y. SEG-D is not for the faint of heart; dd'ing a SEG-D is not a good idea since every shot is a file. Convert the SEG-D tape to a SEG-Y disk file. e.g. sioseis << eof procs segdin diskoa prout end segdin device /dev/rmt/0bn end end diskoa opath oyo_data.segy end end prout fno 0 lno 999999 noinc 100 ftr 1 ltr 1 end end end eof Following steps similar to the AVON04 example: >lsd oyo_data.segy 1 10 SHOT TR RP TR ID RANGE DELAY NSAMPS SI YR DAY HR MIN SEC 10273 1 0 0 1 0 0 7000 1000 2002 256 3 44 13 10273 2 0 0 1 0 0 7000 1000 2002 256 3 44 13 10273 3 0 0 1 0 0 7000 1000 2002 256 3 44 13 10273 4 0 0 1 0 0 7000 1000 2002 256 3 44 13 10274 1 0 0 1 0 0 7000 1000 2002 256 3 44 23 10274 2 0 0 1 0 0 7000 1000 2002 256 3 44 23 10274 3 0 0 1 0 0 7000 1000 2002 256 3 44 23 10274 4 0 0 1 0 0 7000 1000 2002 256 3 44 23 10275 1 0 0 1 0 0 7000 1000 2002 256 3 44 33 10275 2 0 0 1 0 0 7000 1000 2002 256 3 44 33 So it's 4 trace data. Plot a few shots for QC: sioseis << eof procs diskin plot end diskin ipath oyo_data.segy ntodo 20 end end plot vscale 1.25 srpath sunfil.ras nsecs 7 nibs 2859 recsp yes ann shotno end end end eof xloadimage -r 90 sunfil.ras & All four traces look okay, so "vertically stack" them by using ntrgat 4 in diskin and adding stack in the procs. Remember that filter should be done after stack for speed. Finding the right plot "def" was hard because of the noise at the beginning of the data. plot sioseis << eof procs diskin stack filter plot end diskin ntrgat 4 ipath oyo_data.segy ntodo 2000 end end filter ftype 0 pass 20 150 dbdrop 48 end end agc winlen .5 end end plot vscale 1.25 srpath sunfil.ras nsecs 7 nibs 2859 ann gmtint anninc 5 trpin 200 def .02 wiggle 0 end end end eof xloadimage -r 90 sunfil.ras & A 3 trace mix does wonders for reducing the noise in the water column. (plot) sioseis << eof procs diskin stack mix filter plot end diskin ntrgat 4 ipath oyo_data.segy ntodo 2000 end end filter ftype 0 pass 20 150 dbdrop 48 end end mix weight 1 2 1 end end agc winlen .5 end end plot vscale 1.25 srpath sunfil.ras nsecs 7 nibs 2859 ann gmtint anninc 5 trpin 200 def .02 wiggle 0 end end end eof xloadimage -r 90 sunfil.ras & Compare the stack to just using a single trace (stack plot) (trace 4 plot) sioseis << eof procs diskin prout mix filter plot end diskin ftr 4 ltr 4 fno 11500 lno 12000 allno no ipath oyo_data.segy end end prout noinc 100 fno 0 lno 999999 ftr 0 ltr 999 end end filter ftype 0 pass 20 150 dbdrop 48 end end mix weight 1 2 1 end end agc winlen .5 end end plot scalar 40 vscale 1.25 srpath tr4.ras nsecs 7 nibs 2859 ann gmtint anninc 5 trpin 200 def .04 wiggle 0 end end end eof xloadimage -r 90 tr4.ras & Does decon get rid of the 100mil "bubble" pulse? (plot without) (plot with decon) sioseis << eof procs diskin stack mix decon filter plot end diskin ntrgat 4 fno 11500 lno 12000 allno no ipath oyo_data.segy end end decon sedts 4.5 5.5 end end filter ftype 0 pass 20 150 dbdrop 48 end end mix weight 1 2 1 end end agc winlen .5 end end plot vscale 1.25 srpath sunfil.ras nsecs 7 nibs 2859 ann gmtint anninc 5 trpin 200 def .02 wiggle 0 end end end eof xloadimage -r 90 sunfil.ras &Return to SIOSEIS examples. Go to the list of seismic processes. Go to SIOSEIS introduction.