Next: Static Corrections to Remove
Up: Basic Processing Steps
If the noise and signal are separated in the temporal frequency
domain, then bandpass filtering can applied
to the traces to remove such noise.
Strong noise might be low-frequency
surface waves, 60 Hz electrical noise, wind noise, mechanical noise
from human environment, cows or sharks munching on cables, etc..
As an example,
Figure 1.12 depicts a shot gather before (LHS CSG) and after 50-280 Hz bandpass filtering (RHS image).
Much of the low frequency groundroll (i.e., surface waves)
has been eliminated to reveal
many reflection events with pseudo-hyperbolic
CSG seismograms before (LHS) and
after (RHS) 50-280 Hz bandpass filtering. The low
frequency surface waves have been suppressed.