Normal and reverse faulting driven by the subduction zone earthquake cycle in the northern Chilean fore arc

摘要: [1] Despite its location in a convergent tectonic setting, the Coastal Cordillera of northern Chile between 21°S and 25°S is dominated by structures demonstrating extension direction plate convergence. In some locations, however, normal faults have been reactivated as reverse faults, complicating interpretation long-term strain. order to place these new observations context, we model stress changes induced on subduction earthquake cycle. Our simulations predict that interseismic locking boundary encourages slip fore-arc which may result from elastic rebound due interplate earthquakes or seismic aseismic motion takes within period. Conversely, generated strong zone earthquakes, such 1995 Mw = 8.1 Antofagasta event, provides mechanism for reactivation document here. Upper fault response low-magnitude cycle suggests absolute level very low. Furthermore, hazard analysis requires consideration not only but also coincide with pattern. Though relationships permanent strain deformation calculated using models remain unclear, compatibility modeled fields distribution faulting accumulation coseismic megathrust both play significant roles shaping structural behavior upper plate.