Fig. 11

Temporal changes in pore fluid pressure that followed the Kumamoto earthquake (Group 2). a The 11 target regions. b Temporal changes in overpressure coefficients. The circles, diamonds, and triangles in a and b denote depths of the target regions at 5, 10, and 15 km, respectively. The horizontal and vertical coordinates of symbols in b indicate averages of overpressure coefficients of pore fluid pressure that trigger events for the preseismic and postseismic period, respectively. The bars show standard errors (68%). The color scales of each symbol in (a) show the difference of the average of C for the preseismic period from that for the postseismic period. White color means that we did not find any significant temporal increases in C there. The grey rectangles are the same as in Fig. 8