Fig. 1From: Why do aftershocks occur? Relationship between mainshock rupture and aftershock sequence based on highly resolved hypocenter and focal mechanism distributions Map showing the spatial distribution of seismic stations (blue: temporary stations, white: permanent stations). The red star indicates the starting point of rupture during the 2000 Western Tottori Earthquake. The area indicated by the broken red rectangle corresponds to the area appearing in Figs. 2, 3, and 4. In the inset map, the target region is shown with respect to the western part of the Japanese Islands. The thick black lines indicate the surface traces of active faults compiled by the Research Group for Active Faults in Japan (1991). The focal mechanism of the mainshock determined using the P-wave polarities (Ohmi et al. 2002) and CMT inversion (Fukuyama et al. 2003) are shown in (a) and (b), respectivelyBack to article page