Dictionary:Fig M-8

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FIG. M-8. Meissner technique for empirical construction of wavefront chart. (a) Traveltime from source B in the borehole into geophone 6 is posted at (6,B), etc.; contouring the results gives the wavefronts that would have resulted from a source at the top of the borehole (for uniform horizontal layering). (b) Example of a chart showing the effect of a leached salt bed. (After Meissner, 1965.)