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seismic-while-drilling vertical seismic profile

1. n. [Geophysics]
A technique using a seismic source on the surface and receivers in the borehole to acquire a vertical seismic profile (VSP) during pipe connections. Waveforms are transmitted to the surface during drilling operations and can be processed in time to yield reliable time-depth information and sometimes reflection information. Because the survey and analysis can be performed while a well is being drilled, the data can be considered in decisions during drilling operations.