Fig. 2: Resolution for model VoiLA-P19, illustrated by checkerboard tests.
From: Subduction history of the Caribbean from upper-mantle seismic imaging and plate reconstruction
a The input models for the synthetic tests consist of alternating positive and negative velocity perturbations of 10%, either in the odd- or even-numbered layers of the local grid. The horizontal distance between positive and negative anomalies is 1.5°, and their signs are reversed in every perturbed layer. Examples are shown of recovery in (b) layer 2 between 40 and 100 km depth, (d) layer 4 between 160 and 240 km depth, and (f) layer 6 between 320 and 410 km depth for a test where input anomalies are placed only in even-numbered layers. Recoveries in (c) layer 3 (100–160 km depth) and (e) layer 5 (240–320 km depth) are illustrated for input anomalies in odd-numbered layers. More tests are shown in “Methods” and Supplementary Figs. 5–8.
