Fig. 12

Volumetric strain changes and normal stress changes perpendicular to dikes due to an Fujikawa-kako fault zone (FKFZ) earthquake. The upper figure shows isograms of volumetric strain changes at a depth of 20 km, as in Fig. 4, with the epicenters of low-frequency earthquakes (blue squares) and post-Tohoku seismicity (black circles) superimposed. a, b The lower figures illustrate the normal stress changes perpendicular to the extended dike plane (thick gray line in the upper figure), as in Fig. 6, and perpendicular to the PPP (thin gray line in the upper figure), as in Fig. 10