Fig. 7From: Focal mechanisms and the stress field in the aftershock area of the 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7)Stress parameters at nodes shown in Fig. 8. a The orientation of principal stresses: red circles, crosses, and blue circles indicate σ1, σ2, and σ3 at each node, respectively. b Histogram of the stress ratio R = (σ1—σ2)/(σ1—σ3)Back to article page