Abstract
<p>Paleoseismological investigations have been carried out along the Mt. Marine normal fault, a probable source of the February 2, 1703 (Me=6.7) earthquake. The fault affects the area between the 2016 Amatrice and 2009 L’Aquila seismic sequences. Paleoseismological analysis provides data which corroborate previous studies, highlighting the occurrence of 5 events of surface faulting after the 6th–5th millenium B.C., the most recent of which is probably the 2 February 1703 earthquake. A minimum displacement per event of about 0.35 m has been measured. The occurrence of a minimum four faulting events within the last 7,000 years suggests a maximum 1,700 years recurrence interval.</p>
Highlights
The Apennine chain formed since the late Tortonian, contemporaneously to back-arc extension in the Tyrrhenian Sea (Chiarabba and Chiodini, 2013; Chiarabba et al, 2014)
The active tectonics of the Central Apennines is characterized by two NW trending parallel fault structures with mainly normal faulting mechanisms (Galadini and Galli, 2000) (Fig. 2)
In a sector located between the 2016 Amatrice and 2009 L’Aquila seismic sequences, to better understand the late Holocene behavior of the fault and timing of past earthquakes
Summary
The Apennine chain formed since the late Tortonian, contemporaneously to back-arc extension in the Tyrrhenian Sea (Chiarabba and Chiodini, 2013; Chiarabba et al, 2014). Extension generates NW-SE trending, mainly SW-dipping, seismically active normal faults, bounding graben and half-graben basins (Galadini and Galli, 2000). The active tectonics of the Central Apennines is characterized by two NW trending parallel fault structures with mainly normal faulting mechanisms (Galadini and Galli, 2000) (Fig. 2). One splay of the causative fault is located along the south-western side of Mt. Marine with a NWSE trend, bounding the Upper Aterno intermontane basin (Fig. 3). The Mt. Marine Fault (hereafter MMF) is part of a normal fault system comprising four main segments – among which the Paganica fault (PF), activated during the 2009 L’Aquila earthquake (Galli et al, 2010; Moro et al, 2013), with en-echelon pattern, developed between the Capitignano and L'Aquila basin (Fig. 2) (Moro et al 2013; Galli et al 2011).
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