Graphics courtesy of MATTHEW BRZOSTOWSKI and TODD JONES

GEOPHYSICAL CORNER

Complexities Can Be Mind-Bending

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Figure 1a and 1b

Figure 2a

Figure 2b

Figure 3

Figure 4a and 4b

Figure 5:

The depth migration velocity field (left) looks more like the geology the seismic data is trying to image, which results in the accurate positioning of the subsurface point (red dot). The right field is an approximation that does not allow lateral velocity changes, making the algorithm faster but less accurate -- and the positioning of the subsurface point is in the wrong spot (brown dot).

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