Fig. 5

Definitions of precursory periods and foreshocks. a Temporal evolution of average slip velocities of events for parameter sets A–C in Fig. 3. Insets show close-ups of the time periods around the mainshock. Red hatched time periods are the defined precursory periods. b Slip velocity distributions for parameter set B of Fig. 3 with average slip velocities. Foreshocks are defined when the average slip velocity exceeds 1 mm/s. The right panel is a close-up of the time window around the mainshock