Fig. 4

LFE activity in a subregion in Aichi Prefecture (subregion #43) (35.1°N, 137.4°E). 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 of the IN-type model (\({\mu }_{1}\), \({\mu }_{2}\), and \({\mu }_{3}\)). c Aftershock rates 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 1.0