START LOADING THIS NEXT SHOW BY CLICKING HERE Then relax and read this important information (or do some other thing to pass the time). When the show appears, right click and choose "full screen".

THIS SHOW  introduces some coherent noise in the form of seismic refractions, and continues the theme of tuning (in this case the combination of noise and signal). The non-linear logic used to remove the refractions uses advanced pattern recognition procedures. Remember the full screen please.

AGAIN - CLICK FIRST AND READ LATER

 

 

IT HAS BEEN MY EXPERIENCE that few interpreters understand the seriousness of coherent noise. It comes in several forms of course, but here we are looking at seismic refractions. Often refractions are associated with low frequency shear waves, which we see in other shows.

WHILE YOU WAIT FOR THE SHOW TO LOAD - spend some time looking at these points on this before and after:

1. The refractions are marked by their straight lineups and their low (one way) velocities.

2. There is no discernable frequency difference, so frequency sensitive filtering does not help.

3. The central cone is a different problem.

What we have to work with is the two dimensional lineups at low velocities. Spatial pattern recognition is needed, and non-linear techniques is the way to go.

If you can't see the improvement, you may be wasting your time here.

 

 

 

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