This example shows the top of the axial magma chamber on line 70 of the Southern East Pacific Rise.

The input data to this script were stacked and migrated.

Notes:

• The autmatic water bottom picker did not work well on the data because too much energy was migrated into the water column.
• Mute was done last because the FIR filter put energy into the water column.

plot (200KB)

The SIOSEIS script was:

sioseis << eof
procs diskin wbt filter gains weight mute plot  end
diskin
    fno 2850 lno 3450
  ipath /data/lv3/babcock/sepr.70.fdmigr.2142.4059.2a end
end
wbt
day 117
0725 4.04
0738 4.01
0740 3.89
0800 3.84
0805 3.8
0812 3.78
0813 3.88
0820 3.86
0825 3.88
0828 3.75
0830 3.75
0831 3.75
0832 3.87
0833 3.9
0834 3.78
0836 3.78
0844 3.65
0848 3.52
0850 3.48
0859 3.48
0905 3.6
0911 3.62
0915 3.7
0920 3.7
0921 3.68
0923 3.68
0932 3.9
0934 3.9
0935 3.85
0945 3.8
0949 3.9
end
gains
    type 3 alpha 1.5 subwb yes end
end
mute
   ttp 1 .02 addwb yes end end
filter
   pass 5 80 end
end
agc
  winlen .1 center .01 end
end
weight
    fno 0 lno 999999 weight -1 end
end
plot
   ann gmtint anninc 5 nsecs 3
c18 'previously stacked and FD migrated.'
c19 'procs diskin wbt filter gains weight mute plot  end'
c20 'diskin  ipath sepr.70.fdmigr.2142.4059.2a'
c21 'filter  pass 5 80 end end'
c22 'gains  type 3 alpha 1.5 subwb yes end end'
c23 'weight  weight -1 '
c24 ' plot colors -.04 blue -.02 cyan 0 white .02 magenta .04 red'
   scalar 7.e-04 nibs 75 
   colors -.04 blue -.02 cyan 0 white .02 magenta .04 red
   end
end
end
eof
sio2sun pltfil sunfil
xloadimage -r 90 sunfil &