Dictionary:Fig W-6

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FIG. W-6. Wavefront methods. (a) Reversed time-distance curves showing both primary and secondary head waves. (b) Arcs of radii (tnt)/V1 about geophone positions (where tn=arrival time at geophone n) locate wavefront at time t. Symmetry of critical angles shows refractor dip and reconciling the traveltimes locates the refractor. (c) Extension to a second refractor; new arcs are drawn about points where wavefronts impinge on the first refractor to locate the wavefronts in the second layer.