Paleoseismicity of the San Demetrio ne’ Vestini fault (L'Aquila Basin, Central Italy): Implications for seismic hazard

摘要: Abstract The San Demetrio fault is a NW-SE trending normal at the south-eastern tip of L'Aquila Basin zone (Central Apennines, Italy). Detailed field surveys and geophysical investigations, performed in frame seismic microzonation studies after 2009 earthquake ‘ne Vestini territory, have clearly indicated that it capable fault. This paper illustrates results paleoseismic investigations along this fault, confirming its capability. At least five surface faulting events took place during Holocene latest Pleistocene, with variable offsets from few centimetres (four events, latter one most likely occurred historical time) to about 50 cm (one event between 16,430–16010 BCE 7030–6570 BCE). These are consistent, terms displacement per event, data collected on adjacent faults (i.e., Paganica, Roccapreturo, Mt. Pettino Mt Marine faults). Concerning hazard, being southeastern system, reactivations should be associated paleoearthquakes epicentre located northwest centered basin, minimum magnitude ranging 6.0 6.3. Elsewhere, considering position close transfer Subequana Valley another option sympathetic larger ruptures produced by reactivation system. Based scaling relationships, offset 0.5 m before may indicate an M > 6.5, never replicated afterwards