Fig. 1

Map of the study area. The red star depicts the Mw 7.5 mainshock; the green inverted triangles are the BMKG seismic station used in this study; blue traces represent the Palu-Koro Fault; and red traces correspond to the other major crustal faults in the region extracted from Irsyam et al. (2017). The black boxes show the map regions of Figs. 2, 3, 4, 5, 6, 8 and 9