Fig. 12

Comparison between the crustal structure and the slow earthquake distribution in the Japan Trench. a Residual gravity anomalies (Bassett et al. 2016). The residual gravity anomalies are residuals from the along-strike average of satellite-derived free-air gravity anomalies. b Residual P-wave velocity (Vp) tomography along the upper surface of the subducting Pacific Plate. The residual Vp is the residual from the along-strike average of the original Vp model obtained by the tomographic inversion (Hua et al. 2020). c Plate boundary PP reflection intensity (Mochizuki et al. 2005; Mochizuki 2017). The colored line segments indicate the spatial variations of reflection intensity from the plate interface. For an explanation of the other symbols, refer to the legend in the figure. The slow earthquakes, megathrust earthquakes, and small repeating earthquakes are from Fig. 9