Ricerc@Sapienza

We present the results of a geological mapping project
performed in the southern portion of the Sibillini Mts., aimed
at defining the structural relationships between the Sibillini
Mts. Thrust front and the Mt. Vettore normal fault system,
reactivated during the 2016-2017 central Italy seismic sequence.
The Sibillini Mts. Thrust is characterised by a hanging wall
where the Meso-Cenozoic Umbria-Marche succession crops
out, while the footwall is represented by the Messinian Laga
foredeep unit. The Mt. Vettore extensional fault system is
formed by two main normal faults, the Castelluccio Plain and
Mt. Vettoretto faults. Being the cross-cutting relationships
between the structural elements hidden by a thick debris cover,
they have been reconstructed analyzing the geometries of the
hanging wall anticline of the Sibillini Mts. Thrust and other
field constrains. This allowed us to conclude that the Sibillini
Mts. Thrust was displaced by the Castelluccio Plain normal
fault with a max throw of ~ 250 m. Both the Castelluccio Plain
normal fault and the Sibillini Mts. Thrust are cut by the Mt.
Vettoretto fault, which is inferred to reuse in part the inverted
Sibillini Mts. Thrust plane.