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{{#category_index:T|Tomex}} A process for producing vertical seismic profiles using the seismic waves generated by the drill bit as a source. The source waveform is detected by a sensor at the wellhead after traveling up the drillstem. Correlation of the source waveform with the output of a geophone on the surface produces a VSP trace. Developed by Societe Nationale Elf Aquitaine; tradename of Western Geophysical.