Fig. 2From: Source area of the 1858 earthquake swarm in the central Ryukyu Islands revealed by the observations of Father Louis FuretMonthly number of events in each seismic intensity class. Blue, cyan dotted, orange dot dashed, and red bold lines show the monthly number of events corresponding to JMA seismic intensities of 1, 2, 3, and 4, respectivelyBack to article page