BRED
Correctional velocity can be applied to a data set to static shift data into a linear alignment (direct waves or refracted head waves). Alternatively, one can apply hyperbolic (NMO, reflection) correction to the data. Flattening the data on a refracted arrival can make picking first breaks easier in some cases (see section 8.4)
bred infile iopt vred t0 tshift
infile: =name of input file
iopt: =statics option
1=linear trend
0=hyperbolic NMO trend
vred: =reduction velocity
t0: =zero offset time (iopt=0 ONLY)
tshift: =bulk static shift
Figure 14:
(A) Plot of a shot gather, (B) BRED: linear trend, 3000 m/s reduction velocity, .05 seconds offset. See section 8.4.0.1 for an example of picking data with BRED.
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