Publication Date:
2021-05-12
Description:
We report the results of a multidisciplinary investigation performed across the normal Quaternary faults that ruptured the surface during
the August 24 (Mw 6.0) and October 30 (Mw 6.5), 2016 strong earthquakes in the Mt. Vettore-Mt. Bove areas, central Italy. Our aim is to
test the effectiveness of the contribution of a multi-scale gravimetric analysis in characterizing seismogenic faults’ geometry at hypocentral
depths on well-known outcropping faulty systems with known earthquake distribution. We adopted a multi-scale geophysical/geological
approach consisting in the comparison of gravity lineaments inferred by Multiscale Derivative Analysis with the Quaternary structural
setting mapped in the study area, the primary coseismic surface ruptures of the 2016-2017 sequence and the earthquakes’ epicentral
distribution. Moreover, we performed a combined interpretation of 2D hypocentral sections of the 2016-2017 seismic sequences with images
resulting from the Depth from Extreme Points method, to infer the faults’ geometry at depth. Based on our results, the investigated
NW-SE Mt. Vettore-Mt. Bove fault system is dipping 60°-70° westward. We also detected the splays of this primary fault and its blind antithetic
NW-SE structure, dipping northeastward. In the Norcia basin we highlight two main faults bordering the basin with a dip of about
45°. The one edging the eastern side dips westward, whereas the fault edging the western side dips eastward. Thanks to our analysis we
could identify and characterize the geometry of the Norcia and Vettore master faults, as well as other blind/buried and/or silent faults that
are related to the 2016 seismogenic structure. Our results show the effectiveness of this approach in potentially high-hazard areas that are
structurally poorly known.
Description:
Published
Description:
DA558
Description:
2T. Deformazione crostale attiva
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
