GEPH316 Seismic Data Processing

Field Data Workshop 2000



10 Frequency filter design
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Frequency filter design


Spike series

suspike
suspike | suxwigb title="Default spikes" label1="Time (s)" label2="Trace numbers" &
suspike > spike ntr=12 dt=0.0025 nt=100 ix1=1 it1=1 ix2=4 it2=20 ix3=7 it3=40 ix4=10 it4=60
suxwigb < spike title="Spike series" label1="Time (s)" label2="Trace numbers" &
suspecfx < spike | suxwigb title="Spike spectra" label1="Frequency (Hz)" label2="Trace numbers" &
supswigp < spike title="Spike traces" label1="Time (s)"  label2="Trace number" | lp -d mono
suspecfx < spike | supswigp title="Spike spectra" label1="Frequency (Hz)"  label2="Trace number" | lp -d mono
zap xwigb


Normal filter

sufilter
sufilter < spike f=10,20,50,60 amps=0.,1.,1.,0. > spike.filter
suxwigb < spike.filter title="Filter bandpass 20Hz to 50Hz" label1="Time (s)" label2="Trace numbers" &
suspecfx < spike.filter | suxwigb title="Filter spectra bandpass 20Hz to 50Hz" label1="Frequency (Hz)" label2="Trace numbers" &
supswigp < spike.filter title="Filter bandpass 10,20,50,60 Hz" label1="Time (s)"  label2="Trace number" | lp -d mono
suspecfx < spike.filter | supswigp title="Filter bandpass 10,20,50,60 Hz" label1="Frequency (Hz)"  label2="Trace number" | lp -d mono


Butterworth filter

subfilt
subfilt < spike > spike.bfilt fstoplo=10 fpasslo=20 fpasshi=50 fstophi=60 verbose=1
suxwigb < spike.bfilt title="Butterworth bandpass 20Hz to 50Hz" label1="Time (s)" label2="Trace numbers" &
suspecfx < spike.bfilt | suxwigb title="Butterworth spectra bandpass 20Hz to 50Hz" label1="Frequency (Hz)" label2="Trace numbers" &
supswigp < spike.bfilt title="Butterworth bandpass 10,20,50,60 Hz" label1="Time (s)"  label2="Trace number" | lp -d mono
suspecfx < spike.bfilt | supswigp title="Butterworth bandpass 10,20,50,60 Hz" label1="Frequency (Hz)"  label2="Trace number" | lp -d mono
zap xwigb
rm spike.*


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Previous: Frequency spectra Up: Contents Next: Frequency filtering data
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Comments on this information may be mailed to B.Robinson@lancaster.ac.uk
Copyright © Brian Robinson 2000. All rights reserved.
Last updated on 7/03/2000 by BR.