Nature and tectonic significance of co-seismic structures associated with the Mw 8.8 Maule earthquake, central-southern Chile forearc

► The Mw 8.8 Maule earthquake affected the central-southern Chilean forearc. ► Co-seismic ruptures related to elastic rebound were widely developed. ► NW-striking extensional co-seismic ruptures represent the most persistent orientation. ► NW-striking ruptures seems to be spatially associated with pre-existing NW-WNW faults. ► Co-seismic deformation, during major inter plate earthquakes can be, at least in part, controlled by inherited long-term structures. ► Long-lived basement structures should be considered in subsequent slip models associated with the Maule earthquake.