Extended Data Fig. 3: Viscosity and velocity fields of the reference single and double subduction models (that is, the models presented in the main text).
From: Non-collisional orogeny in northeast Japan driven by nearby same-dip double subduction
For both models, we present a horizontal slice (panels a, c) and vertical cross sections at equivalent locations along the Pacific trench (b, d). The horizontal slices are at 30 km depth, that is, beneath the weak crust and through the center of the lithosphere. In the vertical slices, note the localized viscosity reductions adjacent to slabs due to the power-law component of sub-lithospheric mantle viscosity. Profiles number 1 and 3 are those presented in Fig. 1 in the main text. Abbreviations are: EUR: Eurasian Plate; PSP: Phillipine Sea Plate, and PAC: Pacific Plate.
