Abstract
Paleoseismological analyses have been performed in the Central Apennines along faults showing geomorphological evidence of Late Quaternary activity and characterised by the absence of historical seismicity. Three trenches were made along the Mt. Vettore Fault, across a scarp on a Late Pleistocene-Holocene alluvial fan. The youngest displacement event (E1) occurred after 4155-3965 years BP and before the 6th-7th century A.D., a previous event (E2) occurred between 5940-5890/5795-5780 years BP and 4155-3965 years BP, while the oldest event (E3) occurred between 18.000-12.000 years BP and 5940-5890/5795-5780 years BP. One trench was excavated across the Laga Mts. Fault which gave evidence for two displacement events after 8320-8150 years BP. The minimum vertical slip rate estimated through the paleoseismological analysis of the Mt. Vettore Fault is 0.11-0.36 mm/yr, while the minimum slip rate along the Laga Mts. Fault is 0.12 mm/yr. The paleoseismologically inferred recurrence interval is not longer than 4690 years for the Mt. Vettore Fault and not longer than 7570 years for the Laga Mts. Fault, while the minimum elapsed times since the last activation are 1300 and 800 years for the two faults, respectively. The evaluation of the former elapsed time was based on paleoseismological data, while the estimation of the latter was based on the absence of historical earthquakes which may have been caused by the Laga Mts. Fault and on the completeness of the historical catalogues for the large magnitude events in the last eight centuries. Based on the length of the fault at the surface, earthquakes with M 6.5 and 6.6 may be expected from the activation of the Mt. Vettore and Laga Mts. faults, respectively.
Highlights
Recent works summarising data on the geometry and the kinematics of the active faults show that the Central Apennines are affected by two parallel active fault sets characterised by predominantly normal movements
The active faults of the eastern set show geomorphic evidence of past activation related to strong earthquakes, but no significant historical earthquakes may be related to them (Galadini and Galli, 2000)
Further chronological constraints were derived from the Late Pleistocene-Holocene stratigraphic setting of the investigated region which is well known, for the mountainous area, through investigations made with a paleoclimatological perspective since the end of the 80 s (e.g., Frezzotti and Giraudi, 1989, 1990a,b; Frezzotti and Narcisi, 1989, 1996; Giraudi, 1994, 1995, 1998a,b, 2000; Giraudi and Frezzotti, 1997)
Summary
The identification of the active faults mainly followed geomorphologic criteria and paleoseismological data are available for few faults only (i.e. the Campo Imperatore Fault, Giraudi and Frezzotti, 1995; the Aremogna-Cinquemiglia Fault, D’Addezio et al, 2001; the Ovindoli-Pezza Fault, Pantosti et al, 1996; the Fucino Fault, Galadini and Galli, 1999). The active faults of the eastern set show geomorphic evidence of past activation related to strong earthquakes, but no significant historical earthquakes may be related to them (Galadini and Galli, 2000). For this reason we usually define these faults as «silent». Further sections will be dedicated to the definition of the parameters describing the fault behaviour (slip rate, recurrence interval, elapsed time since the last activation, maximum expected magnitude)
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