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Paleoseismological analyses have been performed in the Central Apennines along faults showing geomorphological&#13; evidence of Late Quaternary activity and characterised by the absence of historical seismicity. Three&#13; trenches were made along the Mt. Vettore Fault, across a scarp on a Late Pleistocene-Holocene alluvial fan. The&#13; youngest displacement event (E1) occurred after 4155-3965 years BP and before the 6th-7th century A.D., a previous&#13; event (E2) occurred between 5940-5890/5795-5780 years BP and 4155-3965 years BP, while the oldest&#13; event (E3) occurred between 18.000-12.000 years BP and 5940-5890/5795-5780 years BP. One trench was excavated&#13; across the Laga Mts. Fault which gave evidence for two displacement events after 8320-8150 years BP.&#13; The minimum vertical slip rate estimated through the paleoseismological analysis of the Mt. Vettore Fault is&#13; 0.11-0.36 mm/yr, while the minimum slip rate along the Laga Mts. Fault is 0.12 mm/yr. The paleoseismologically&#13; inferred recurrence interval is not longer than 4690 years for the Mt. Vettore Fault and not longer than 7570&#13; years for the Laga Mts. Fault, while the minimum elapsed times since the last activation are 1300 and 800 years&#13; for the two faults, respectively. The evaluation of the former elapsed time was based on paleoseismological data,&#13; while the estimation of the latter was based on the absence of historical earthquakes which may have been caused&#13; by the Laga Mts. Fault and on the completeness of the historical catalogues for the large magnitude events&#13; in the last eight centuries. Based on the length of the fault at the surface, earthquakes with M 6.5 and 6.6 may&#13; be expected from the activation of the Mt. Vettore and Laga Mts. faults, respectively

Paleoseismology of silent faults in the Central Apennines (Italy): the Mt. Vettore and Laga Mts. Faults