Fig. 5: Schematic of the model setup and initial thermal condition.
From: Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces
Thermal boundary conditions are as the initial thermal condition (top boundary is at 0 °C and ambient mantle is 1350 °C). Mechanically, the top boundary is a free surface and the bottom closed and non-slip. The left (Philippine) side is closed and non-slip above 80 km and open below. The right (Pacific) side is open but an additional pressure can be added above 50 km to facilitate the application of an external push force. The schematic graph to the right of the figure is of the envelope of this applied pressure. Crust and sediment layers make up the top 7 and 1 km of the model domain initially and this material is tracked. The white box outlines the region to which the additional pull force is applied. *“fracture zone” material (outlined by the blue box) and sediment are initialised the maximum amount of “damage” (see main text).
