Plane-wave Transformation

The 801 shot gathers are encoded with linear time-shift encoding (equation ) to form 31 plane-wave gathers with ray parameters ($p$ ) ranging from -333 $\mu$ s/m to 333 $\mu$ s/m with an even sampling in $p$ . Figure  shows a plane-wave gather with $p$ =22.2 $\mu s/m$ . It is obvious that the direct wave is well separated from the reflections and can be easily muted.

Figure: A plane-wave gather with p=22.2 $\mu$ s/m for the Marmousi2 model.