Figure 1

Fig. 1. 

Two examples of global tectonic regionalization overlain on a shaded relief map from the ETOPO1 (Eakins and Amante, 2009). (A) the Crust 1.0 model (Laske et al., 2013) based on ‘shallow’ geophysical observations and geological provinces where we have amalgamated the 36 distinct crustal types globally into 9 related types for the continents as described in the legend. (B) is the regionalization of (Lekic and Romanowicz, 2011) clustering analysis of global seismic tomography into six “similar” styles of lithosphere (“Clusters #1–6”) with no a priori constraints from near-surface geology. In this model there is no distinction between continental and oceanic regions so we have applied a translucent mask to emphasize the distribution of the clusters within the continents. The numbering is arbitrary and matches that chosen by the authors of the study, and we have chosen a color scheme which emphasizes the similarity of old, stable regions in each map.