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Decoding  the  reverberations.

Multiples' Decoding: Common Offset Gather (714 m: segment 6-11 km)

Figure 1. Segments of one of Common Offset Gathers
from the previous page : the offset is 714 m, the first segment represents the input,  the last one - output.

To testify for the correctness of the processing, a posteriori identification of multiples has been done.  The identification is carried out with compressing of Common Offset Gathers with respect to the space scale: the resulting image of "an artificial medium" is easy interpretable:  all of physical rays in such a medium should be close to the vertical (in spite of the real offsets are far from zero: the offset is 714 m).  Now all of reverberations related to any pair of strong horizons (free surface, sea-bottom, "basalt")  look like  a family of "synclines" of near to equal "thickness" (along the time axis) and with common vertex.
NB! Certainly, the identification is rather conventional: just one of the relevant codes is indicated: see,  e.g.  peglegs  (Figure 4): "301 "= "103",  "302"= "203",  and so forth. Note, that the see-surface   index  (0 )  is omitted, if it occurs just one time in a given code.

Input: Common Offset Gather (714 m)Output: Common Offset Gather (714 m)

Figure 2. Common Offet Gather (714 m).
Underneath  the sea surface (0) two strong horizons are mostly seen: sea -bottom (1) and "basalt" (2): see, e.g. the next Figure 3.

Intrabed reverberations, the 3rd group of primaries:related peglegs: 13-16 km

Figure 3.  Intrabed reverberations, the 3rd group of multiples and related peglegs.
Again: 301 is the code which stands for 301 and 103.
Zoom: just the 3rd group of primaries and related peglegs: 12-14 km
Figure 4. Just "the 3rd group of primaries"- related peglegs are shown.


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