Fig. 2

LFE activity in a subregion near the Bungo Channel (33.0°N, 132.1°E; subregion #1). a LFE magnitude–time diagram. b Interevent time histogram (orange bars). The blue curve indicates the interevent time distribution of the IN-type model. Vertical dashed lines denote the three characteristic time constants (\({\mu }_{1}\), \({\mu }_{2}\), and \({\mu }_{3}\)) of the IN-type model. c Aftershock rates (LFE occurrence rates after a single LFE) predicted by the L-type, IN-type, and ETAS models (red, blue, and green lines, respectively). The maximum likelihood estimate of the ETAS model p value is 1.1