Translations:Dictionary:Vertical seismic profiling/2/en

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FIG. V-10. Vertical seismic profile. (a) Each trace is recorded at a depth in a borehole using an air-gun source at the surface. (b) Same except each trace has been shifted by the one-way traveltime to the surface, thus aligning reflections (upcoming events) horizontally. A shift in the other direction would align downgoing events horizontally. (c) Portion of a reflection record section across the well location. (d) Sonic log in the well[1].
  1. Sheriff, R. E; Geldart, L. P (August 1995). Exploration Seismology, 2nd Ed. Cambridge Univ. Press. p. 490. ISBN 9780521468268.