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.
\includegraphics[scale=0.7]{Figure14.pdf}