Fig. 11

a Seismotectonic information in the south of Northern Banda Arc, by compiling the onshore active faults by Patria et al. (2021) (red lines) and the Global CMT solution (navy beach balls) for inland events with depth < 20 km and a magnitude more than Mw 5 in the period of 1976–2018 b Interpretation of fault reactivations in Ambon Island by combining aftershock distribution, source mechanism, and geological fault data by Patria et al. (2021). The aftershock epicenters are plotted with green circles with increased size following the magnitude values. Focal mechanisms obtained in this study are plotted as navy beachballs following the magnitude size with numeric labels to indicate the event ID. The red straight lines show the fault segments mapped by Patria et al. (2021), dominated by dip-slip faults (notated by Up-Down labels: U-D), while the interpreted faults are represented by red dashed lines. c Vertical cross-sections of the aftershock earthquake sequence in Ambon Island on line D-D’. The aftershock events are represented by green circles, which its size represents the magnitude value in Mw. Focal mechanisms obtained in this study are plotted as navy beach balls following the magnitude size with numeric labels to indicate the event ID. Label SF1 and SF2 represent two strike-slip faults and NF represents normal faults. The red dashed lines reflect the interpreted strike-slip fault planes