Stacking Analysis

We would first like to verify that there is a substantial amount of coherent energy in the data. It is difficult to inspect the data visually in 3-D for coherency. Lin Zhang at SEP found a useful way to get a first look at the coherent energy present in the data. He partially stacks the array data along four different profiles. This procedure yields four stacks which can be placed side by side, to give an initial view of the energy and moveouts present in the data. Figure  shows the four directions along which the data were partially stacked, the ``inline'' and ``crossline'' directions of the array, and the two diagonals. Figure  shows the four stacks produced for a four second portion of one record. While the signal to noise ratio is not large, it is clear that there is some coherent energy present in the data; several different moveouts can be seen on close inspection.