Structural complexities and tectonic barriers controlling recent seismic activity in the Pollino area (Calabria–Lucania, southern Italy) – constraints from stress inversion and 3D fault model building
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Published:2022-01-27
Issue:1
Volume:13
Page:205-228
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ISSN:1869-9529
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Container-title:Solid Earth
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language:en
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Short-container-title:Solid Earth
Author:
Cirillo DanieleORCID, Totaro Cristina, Lavecchia Giusy, Orecchio Barbara, de Nardis Rita, Presti Debora, Ferrarini FedericaORCID, Bello Simone, Brozzetti Francesco
Abstract
Abstract. We reconstruct the 3D fault model of the structures causative of
the 2010–2014 Pollino seismic activity by integrating structural–geological
and high-resolution seismological data. We constrained the model at the
surface with fault-slip data, and at depth, by using the distributions of
selected high-quality relocated hypocenters. Relocations were performed
through the non-linear Bayloc algorithm, followed by the double-difference
relative location method HypoDD applied to a 3D P-wave velocity model.
Geological and seismological data highlight an asymmetric active extensional
fault system characterized by an E- to NNE-dipping low-angle detachment, with
high-angle synthetic splays, and SW- to WSW-dipping, high-angle antithetic
faults. Hypocenter clustering and the time–space evolution of the seismicity suggest
that two sub-parallel WSW-dipping seismogenic sources, the
Rotonda–Campotenese and Morano–Piano di Ruggio faults, are responsible for
the 2010–2014 seismicity. The area of the seismogenic patches obtained
projecting the hypocenters of the early aftershocks on the 3D fault planes,
are consistent with the observed magnitude of the strongest events
(Mw=5.2, and Mw=4.3). Since earthquake-scaling relationships
provide maximum expected magnitudes of Mw=6.4 for the
Rotonda–Campotenese and Mw=6.2 for the Morano–Piano di Ruggio faults,
we may suppose that, during the sequence, the two structures did not entirely release
their seismic potential. The reconstructed 3D fault model also points out the relationships between
the activated fault system and the western segment of the Pollino Fault.
The latter was not involved in the recent seismic activity but could have
acted as a barrier to the southern propagation of the seismogenic faults,
limiting their dimensions and the magnitude of the generated earthquakes.
Funder
Ministero dell’Istruzione, dell’Università e della Ricerca
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Earth-Surface Processes,Geochemistry and Petrology,Geology,Geophysics,Soil Science
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