The primary role of the Paganica-San Demetrio fault system in the seismic landscape of the Middle Aterno Valley basin (Central Apennines)

摘要: Abstract The Paganica normal fault, that caused the April 9, 2009, L'Aquila earthquake (Central Apennines), is part of Paganica-San Demetrio fault system (PSDFS). All available data useful to constrain Quaternary activity PSDFS were reviewed, with aim point out its role in landscape evolution region and particularly Middle Aterno Valley basin. Uplifted remnants a low relief (Summit Paleosurface, SP) about 800 m total offset since late Lower Pleistocene. Also, sedimentary cycle ended at beginning Pleistocene now displaced 550 m along PSDFS, whereas alluvial deposits containing tephra layers (560–360 ka) have been more than 150 m by segment. long term slip rate values based on this evidence (ranging between 0.4 0.9 mm/y), together short displacements Late geomorphic features deposits, shown i) has played primary area, despite minor appearance, ii) linked depth other important listric faults located footwall (Assergi Campo Imperatore faults) paper are interpreted as secondary faults. This result relevant seismotectonic implications for main seismic source basin controls also potential structures, including Assergi