Fig. 4

Frequency–magnitude distributions of the 2016 Kumamoto earthquake sequence. a, b Frequency magnitude distributions and c, d b-value versus magnitude: a, c for the entire sequence (foreshocks and aftershocks), mainshock excluded, and b, d for the foreshocks and aftershocks, separately. The red and blue colors indicate foreshocks (b₁) and aftershocks (b₂), respectively. The frequency–magnitude distributions show both the cumulative (black) and noncumulative number (light gray) of events. The dashed black line indicates Mc estimated by the MAXC method