Fig. 6
![Fig. 6](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40645-018-0234-1/MediaObjects/40645_2018_234_Fig6_HTML.png)
A schematic geologic profile at ~ 6 Ma and present. The profiling line A-A’ is shown in Fig. 1. A buoyant slab of the Philippine Sea Plate might have been stagnant beneath the crust of southwest Japan after the abnormal volcanic activity at ~ 13 Ma (Kimura et al. 2014) and the subduction of the slab restarted at ~ 6 Ma. The present rupture area in the eastern Nankai region might be controlled by the dense and stiff upper plate originating from the middle Miocene igneous rocks (Kimura et al. 2018)