Fig. 6

Colored circles represent the distribution of the 4- to 20-Hz energy release in each time period. The panels entitled by “April 14 21:26 M JMA6.5” and “April 16 01:25 M JMA7.3” represent the energy release within −5 to 25 s after the origin times of the April 14 and April 16 events, respectively. The blue circles represent the JMA unified hypocenters detected in each time period