Fig. 6

Paleo-reconstruction of the plate boundary system across Cascadia, at 2 million year increments illustrating the evolution of the tectonics of southern Cascadia. Maroon shading shows the approximate region of NNW-shortening, blue shading shows the approximate region of subduction-related upper-plate shortening and gray shading outlines regions experiencing right-lateral translation. The paleo-shorelines shown in the ~ 6–5 Ma reconstructions are interpolated from Lock et al. (2006). The SNGV block location is based on Faulds and Henry (2008). a, b ~ 6 Ma reconstructions. c, d ~ 4 Ma reconstructions. e, f ~ 2 Ma reconstructions. g, h 0 Ma/present-day