A series of aftershocks began immediately after the mainshock, at intervals of 15-30 minutes, with one aftershock reaching 6.6Mw within 34 minutes of the initial quake.
A second major earthquake occurred on 12 May 2015 at 12:50 NST with a moment magnitude (Mw) of 7.3Mw 18 km (11 mi) southeast of Kodari.