Fig. 4: Modelled dilatation along the Sunda margin.
From: Bridging the gap between subduction dynamics and the long-term strength of the Sunda megathrust
a Model 1, upper mantle slab only, b Model 2, as in Model 1, slab extending to Banda, c Model 3, whole IAP and passive lower mantle, d Model 3a, as in Model 3, lower mantle densities as in Fig. 1c, e Model 3b, as in Model 3, lower mantle densities from Smean tomography (see text), f Model 3c, as in Model 3a, buoyancy of the Indian slab is increased. The magenta line with squares marks the location of the trench. Contour lines for the slab depth. Negative and positive dilatation in the upper plate indicate horizontal contractional (blue) and extensional (green) strain regimes, respectively, while the orange line is for 0 dilatation. g Modelled dilatation along a trench parallel profile in the back-arc region of the Sunda plate. Solid colored lines for the models (color-coded as in a to f). Dashed and dotted-dashed black lines show observed values from profiles at 400 ± 50 km due to discontinuities in the observation dataset. The inset map illustrates the location of the profiles. All the panels were created with open-source software Python and library Matplotlib.
