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We consider a checkerboard microgeometry where variables cannot be separated.
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Only the most courageous should consider a checkerboard sofa sitting on an oversize checkerboard floor, as Frank did for the 1939 World's Fair.
Should we consider a guide?
Specifically, we considered a 3-dimensional checkerboard-like sample with variable grid size, one grid corner being centered at the focus.
We consider the variation to be well constrained because its wavelength is comparable to the variation recovered in the checkerboard tests.
We are considering a hotel.
Considering our OBS spacing and the target scale of the structural variations, we adopted a checkerboard grid size of 25 km (horizontal) and 5 km (depth), and assigned positive and negative velocity perturbations of 5% to each grid.
We conducted a checkerboard resolution test in order to check the reliability of the result.
We conduct a checkerboard resolution test in order to evaluate the reliability of the obtained solution.
We performed a checkerboard resolution test (CRT) (Spakman and Nolet 1988), to evaluate the spatial resolution of the velocity model.
To assess the resolution of the model for line SPr2, we applied a checkerboard test (Fig. 7(b)) using the same procedure as used previously for lines OGr1 and SPr2 (Takahashi et al., 2009; Kodaira et al., 2010), but, here, we used a finer checkerboard pattern (i.e., a 10 km horizontal by 5 km vertical pattern to 15 km depth).
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