Fig. 1
From: Inelastic strain rate in the seismogenic layer of Kyushu Island, Japan
a Distribution of P- and T-axis orientations for shallow earthquakes on Kyushu Island. Green and red indicate P- and T-axis dip angles of greater than 45°, respectively. Blue, green, and red axes denote strike, normal, and reverse faulting of the earthquakes, respectively. Purple lines indicate surface traces of the active fault. Yellow triangles indicate active volcanoes. The location map for Kyushu is shown in the lower left. b Relationship between the magnitudes of earthquake estimated from the amplitude of the velocity seismogram (M a) and the scalar seismic moment (M 0). Blue symbols indicate values for earthquakes as determined by Iio et al. (2006) and the CMT catalog by NIED. Orange ovals represent the average moment value for each magnitude range at intervals of 0.2. The dotted line represents a linear regression line fitted to the data, and its formula is given in the text (after Matsumoto 2016)