Fig. 7
From: Characteristics of seismic activity before and after the 2018 M6.7 Hokkaido Eastern Iburi earthquake
Deep aftershocks of the M6.7 Eastern Iburi earthquake (iii) ranging in depth from 23 to 55 km. a The epicenters (left panel) and longitude vs. time plots (right panel). Horizontal lines divide the deep seismicity into northern, central, and southern clusters. The vertical line in the space–time plots (right panel) indicates the respective time of the change-points in the northern and southern sub-regions. b The two-stage ETAS model fitted to the northern cluster, which includes the M5.8 largest aftershock (iv) and its aftershocks. c The ETAS model fitted to the central cluster, which includes the main shock (iii). d The two-stage ETAS model fitted to the southern cluster, which includes the swarm events that occurred 24 days after the main shock. The dashed red cumulative curves show those of the reference ETAS model for the entire period. See Additional file 1: Table S7 for the fitting configurations and results of model comparisons