Figure 9. Maximum (SH) and minimum (Sh) horizontal stresses measured by hydrofracturing by Ikeda et al. (1997) and Tsukahara et al. (1997) after the Hyogo-ken Nanbu earthquake in the Hirabayashi and Ogura boreholes, respectively (Figure 1). Circles show the upper bound on the post-earthquake shear stress on a vertical plane. At both boreholes SH was approximately normal to the fault; dashed lines show resulting modified shear stress on the fault. The Hirabayashi borehole passed through a cataclastic zone inferred to be the Nojima fault at depths of 1.1-1.3 km. SV is the assumed vertical stress.