The Muccia swarm in Central Italy

On 04/04/2018 an earthquake of Mw 4.0 occurred in the Muccia area (Camerino) in central Italy.

Hypocentres show a clear distribution, where they show the presence of a detachment by NE-dipping and a master faults by SW-dipping (f). Moreover hypocenters highlight the presence of a dilated wedge (type I), located in the hangingwall of the master fault (f) and a secondary fault (R') antithetical to f. This two faults

Dilated wedge is characterized by earthquakes with a extensional focal mechanism. This indicates how the area is subject to SW-NE extension, at a depth of between 7-10 km about. The two conjugate faults, f and R', delimit a wedge (W) with a crustal thickness of 6-7 km about and without a co-seismic deformation inside it.

Trace A-A' in map

The continuous seismic deformation in the dilated wedge and in outside wedge area, could lead to gravitational collapse of the wedge and generate strong graviquakes along master fault (f). It is not possible to define a time of occurrence, but it is plausible to consider the area "tectono-gravitationally" unstable.

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