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Data Processing
 A seismic reflection section is, in principle, a series of seismic traces recorded by a geophone at the same location as the shot. Each trace must be time-corrected to allow for the source-geophone offset, the correction depending on the layer velocities. If the correction is accurate, a given reflection is moved up the trace to the position it would have were the source and receiver coincident. Using the field procedure described previously, 24 individual traces, of various source-receiver offsets, will have a common midpoint. These 24 traces, after correction, are summed to produce one common depth point, or 24-fold CDP trace.
The resulting summed traces are then displayed as a single seismic cross-section. A seismic trace may contain from hundreds to thousands of individual samples. With each shot generating 48 traces, a typical seismic line will contain several million samples.
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