(a) Map of topography and station distribution around the Xinfengjiang Reservoir. Major active faults are HYF, RZSF, DYF and Shijiao-Xingang-Baitian fault. The top-left inset is regional map with the blue box indicating the geographical location of the reservoir. (b) Distribution map of earthquakes recorded from 2012 to 2015 in the Xinfengjiang Reservoir (after He et al. 2018). Coloured circles represent earthquakes with magnitudes greater than 0, while yellow star denotes the M 6.1 mainshock and red stars denote earthquakes with magnitudes greater than 4.0 (ID1-ID4). AA’, BB’, CC’ and DD’ are cross-sections projected through the earthquakes. Red arrows represent the direction of the maximum principal stress (Ding et al. 1983).