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Figure 2 shows a zero or near offset VSP (left panel) and a corridor stack of VSP traces (right panel). The VSP has been corrected to two-way time so that reflections from horizontal reflectors appear at the same time on traces recorded at different levels. The corridor stack (right) is a partial summation or stacking of the VSP traces (left). Stacking, a summing of data to produce a single output trace, enhances the signal to noise ratio of seismic data. Graphics courtesy of R. J. Brewer.
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Figure 2 shows a zero or near offset VSP (left panel) and a corridor stack of VSP traces (right panel). The VSP has been corrected to two-way time so that reflections from horizontal reflectors appear at the same time on traces recorded at different levels. The corridor stack (right) is a partial summation or stacking of the VSP traces (left). Stacking, a summing of data to produce a single output trace, enhances the signal to noise ratio of seismic data. Graphics courtesy of R. J. Brewer.