Real data example

Figure  shows quarry blast data from the SEP passive experiment. The 3-D data have been plotted here in 2-D, with the traces sorted by distance from the quarry. The interpolation scheme has been used to filter random noise, and also as a moveout-dependent filter, removing energy with apparent velocities less than 4 kilometers/second. In the processed panel on the bottom, steeply dipping energy corresponding to nearby cultural noise sources has been removed, and the overall noise reduction has made it easier to see several weak near-vertically incident arrivals at late times, corresponding to reflections from layers deep in the crust.

 

blastint
Figure 7 Quarry blast data before (top) and after (bottom) processing to remove random noise.