Publication Date:
2022-06-10
Description:
Starting from 24 August 2016, a long seismic sequence, including nine Mw 〉 5.0 earthquakes,
struck a wide area of the Central Italy. A large amount of geological, geodetic, and seismological data
envisages a complex system of NNW-SSE trending, seismogenic normal faults. These active tectonic
structures are well known at the surface and consistent with previous seismotectonic studies. 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 NorciaMw 6.5 mainshock (30 October 2016),
based on previously unpublished seismic reflection profiles and available geological data. All the data have
been synthesized along a 47 km long, WSW-ENE trending geological cross section, interpreted down to a
depth of 12 km. 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. The basement has been constrained at depths of 8 to 11 km and coincides with the
cutoff of the seismicity. We have also traced the trajectories of the seismogenic normal faults activated during
this seismic sequence, reconciling the high-angle (dip〉65°) normal faults exposed at the surface, with
their angle (dip 〈 50°) at hypocentral depths. The results of this study may be useful for better understanding
the rheological properties of the seismogenic rock volume, as well as the coseismic deformations of the
topographic surface observed by geodetic techniques and field mapping.
Description:
Published
Description:
1116-1137
Description:
4T. Sismicità dell'Italia
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
Permalink
