We have also traced the trajectories of the seismogenic normal faults activated during this seismic sequence, reconciling the high-angle (dip>65В°) normal faults exposed at the surface, with their angle (dipВ <В 50В°) at hypocentral depths. The basement has been constrained at depths of 8 to 11В km and coincides with the cutoff of the seismicity. Comparing the subsurface geological model with the available seismological data, we find that the majority of seismicity is confined within the sedimentary sequence and does not penetrate the underlying basement. All the data have been synthesized along a 47В km long, WSW-ENE trending geological cross section, interpreted down to a depth of 12В km. In order to improve the comprehension of the seismotectonic framework of this seismic sequence, we provide a novel reconstruction of the subsurface geology of the area close to the Norcia M w 6.5 mainshock (30 October 2016), based on previously unpublished seismic reflection profiles and available geological data. These active tectonic structures are well known at the surface and consistent with previous seismotectonic studies. A large amount of geological, geodetic, and seismological data envisages a complex system of NNW-SSE trending, seismogenic normal faults. Starting from 24 August 2016, a long seismic sequence, including nine M wВ >В 5.0 earthquakes, struck a wide area of the Central Italy.

Angle of reflection seismic