Translations:Dual-sensor wavelet estimation/7/en

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A traveling-wave assumption that links the pressure attribute and the particle-velocity attribute of a wavefield must be made before a geophysicist can process conventional seismic data acquired in the field. Let us give an example. Look at the event on the left side of Figure 18. There is no way to tell whether that event is upgoing or downgoing. Now introduce the traveling-wave assumption as specified on the right side of Figure 18 (also see below). The traveling-wave assumption is that the event is a primary reflection. This additional information makes it possible to say that this event is upgoing.