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 yr. BP and before the 6th-7th century AD, a previous event (E2) occurred between 5940-5890/5795-5780 yr. BP and 4155-3965 yr. BP, while the oldest event (E3) occurred between 18000-12000 yr. BP and 5940-5890/5795-5780 yr. BP. One trench was excavated across the Laga Mts. fault which gave evidence for two displacement events after 8320-8150 yr. 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 4,690 years for the Mt. Vettore fault and not longer than 7,570 years for the Laga Mts. fault, while the minimum elapsed times since the last activation are 1,300 and 800 years for the two faults, respectively. The evaluation of the former elapsed time has been based on paleoseismological data, while the estimation of the latter is 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.
Paleoseismology of silent faults in the central Apennines (Italy): the Mt. Vettore and Laga Mts. faults.
2003
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 yr. BP and before the 6th-7th century AD, a previous event (E2) occurred between 5940-5890/5795-5780 yr. BP and 4155-3965 yr. BP, while the oldest event (E3) occurred between 18000-12000 yr. BP and 5940-5890/5795-5780 yr. BP. One trench was excavated across the Laga Mts. fault which gave evidence for two displacement events after 8320-8150 yr. 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 4,690 years for the Mt. Vettore fault and not longer than 7,570 years for the Laga Mts. fault, while the minimum elapsed times since the last activation are 1,300 and 800 years for the two faults, respectively. The evaluation of the former elapsed time has been based on paleoseismological data, while the estimation of the latter is 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
