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Figure 4 – Seismic frequency (vertical axis) and wavelength (horizontal axis) information
embedded in the data window labeled Transform window on figure 3. This data
analysis shows that if production seismic data are acquired at this test site
with a 220-foot receiver array (figure 3), the frequency bandwidth should span
approximately 80 Hz and each field record should be dominated by high-velocity
reflection signals (events labeled Reflector 1 and Reflector 2). The format
used to exhibit this frequency-wavelength information on a black/white printer
shows how geophysicists had to display data analyses in the field in olden days
before color plotters were field portable.