Rupture areas of historical quakes near the 16 April 2016 M=7.8 event. The 1942 rupture area nearly coincides with the 2016 quake. There was also a M=7.1 shock in 1998 (Chlieh et al., 2014), which lies within, or just south of, today’s aftershocks. The 2016 event could also trigger a a subsequent megathrust quake to the north, or on the right-lateral Jama-Quininde fault (Collot et al. 2004).