BSUM
The median mix is an estimate of the down-going wave in this example. When subtracted from the total wave-field data, the result should be up-going waves. See Figure 88 (B) .
bsum infile1 infile2 scalef
infile1 = first input file name
infile2 = second input file name
scalef = scale factor
output = input1 + scalef*input2
The up-going wave field estimate is then shifted back to 1-way time. Then the data are shifted again by the direct wave down-going times (this time without any bulk shift, to adjust the data to 2-way time. The reflections should be flattened in 2-way time (see Figure 89).
Figure 88:
BMED: (A) median mix of the direct wave (see figure 87 B) (B) BSUM: direct down-going wave estimate subtracted from total wave field.
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Figure 89:
BSHF: (A) median mix of the direct wave (see figure 87 B) (B) BSUM: direct down-going wave estimate subtracted from total wave field. Data in 2-way time.
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