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FIG. 9. Comparison of common midpoint (CMP) gathers from the three-dimensional Hanford Site survey (A) before and (B) after eigenvector filtering to suppress the air velocity scattering noise. The off-end events are horizontal in the CMP domain and are effectively separated from the subsurface reflections. Surface scatter events are indicated with arrows. CDP Y is the inline position as shown in Fig. 8.
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