Page 379 - Acquisition and Processing of Marine Seismic Data

370 7. SUPPRESSION OF MULTIPLE REFLECTIONS

FIG. 7.5 (A) A brute stack with an NMO correction using 1500 m/s constant velocity, and (B) full stack with the velocities of
primary reflections. M denotes the multiple energy. Autocorrelograms of each section are given in the bottom panels.

relatively high amplitude multiples on the stack mute, and it can provide a better stack section
data. To prevent the amplitudes of the multiples with lower multiple energy. Fig. 7.8 shows an
in near offset traces from increasing the multiple example application of inner mute. In Fig. 7.8B,
energy after stacking, one can mute out the spe- the near offset parts of the multiple reflection
cificzonesofnearoffsettraceswherethemultiple amplitudes are muted out and a better stack sec-
amplitudes are distinct. This is known as inner tion is obtained in which most of the first-order