Dictionary:Fig S-31

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FIG. S-31. Syslap method. (a) Explosion in center hole generates mainly P-waves. (b) Because of the asymmetry produced by the explosion in the center hole, the explosion in the right hole generates S-waves as well as P-waves. (c) The left hole produces P-waves plus S-waves of polarity opposite to those from the right hole. Subtracting records from the right and left holes doubles the S-wave contributions and considerably reduces the P-wave contributions. (Courtesy CGG.)