Fig. 2From: Characteristics of relocated hypocenters of the 2018 M6.7 Hokkaido Eastern Iburi earthquake and its aftershocks with a three-dimensional seismic velocity structureDistribution of stations and grid configurations (red and blue crosses) used in the relocation by the double-difference tomography method. The relocation of the present study shown in Fig. 3 used permanent seismic stations, which are denoted as red squares. Green squares denote the temporary stations which were operated in 1999 to 2001 (Katsumata et al. 2003). Both the permanent and temporary stations were used in the estimation of the detailed seismic structure shown in Figs. 4 and 5Back to article page