Finite element modelling of stress field perturbations and interseismic crustal deformation in the Val d'Agri region, southern Apennines, Italy

摘要: Abstract The Val d'Agri area provides the opportunity to analyse active structures in a seismic region for which large amount of subsurface data is available. This area, was struck 1857 by one most destructive earthquakes Italy (MW = 7.03), represents unique natural laboratory gain new insights into geometry, modes and rates faulting controlling crustal deformation an actively extending orogen. In this study, geological section through southern Apennines discretized finite element model (FEM). We present 2D elastoplastic FEM that reproduces stress perturbations strain field around fault system. influence strand activity on interseismic tested series computer models, whose predictions are compared with horizontal velocity components continuous GPS sites directions data. best fit available geophysical constraints obtained 300 km long, 29 km deep formed multilayer including three having different rheological characteristics several shallow, locked segments, branch freely slipping major basement at depth. Finite modelling controversial widely debated tectonic setting study pointing out fundamental role played structural reactivation process involving inherited, long-lived, mature systems Our FEM, reconciling apparently contrasting from points maximum build up accumulation depth 15 ± 5 km. Such range suggested as likely nucleation events such earthquake.