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Pliocene–Quaternary seismogenic faults in the inner Northern Apennines (Valdelsa Basin, southern Tuscany) and their role in controlling the local seismicity

Published online by Cambridge University Press:  10 February 2022

Francesco Mirabella Open the ORCID record for Francesco Mirabella [Opens in a new window] ,
Thomas Braun ,
Andrea Brogi Open the ORCID record for Andrea Brogi [Opens in a new window]  and
Enrico Capezzuoli Open the ORCID record for Enrico Capezzuoli [Opens in a new window]
Francesco Mirabella*
Affiliation:
Department of Physics and Geology, University of Perugia, 06123Perugia, Italy
Thomas Braun
Affiliation:
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Oss. di Arezzo, 52100Arezzo, Italy
Andrea Brogi
Affiliation:
Department of Earth and Geoenvironmental Sciences, University of Bari, 70125Bari, Italy Institute of Geosciences and Earth Resources IGG-CNR, 56124Pisa, Italy
Enrico Capezzuoli
Affiliation:
Department of Earth Sciences, University of Florence, 50121Florence, Italy
*
Author for correspondence: Francesco Mirabella, Email: [email protected]
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Abstract

Pliocene–Quaternary faults are relevant structures with which to constrain the seismotectonic context and contribute to the evaluation of the seismic hazard of a region. Many of these faults, however, do not show clear surface evidence even when releasing earthquakes. For these reasons they can be extremely dangerous as they receive relatively little attention and can be difficult to identify. From among the various surface geology studies and/or palaeoseismological investigations, we focus our attention on the integration of different datasets such as seismic reflection profiles, surface kinematic data and the relocation of seismological data, which make it possible to identify and characterize active faults whose dimension and earthquake potential would otherwise not be large enough to make them identifiable. We take as an example the Montespertoli NE-trending fault in southern Tuscany (central Italy) with which we associate the 2016 M=3.9 Castelfiorentino earthquake. This structure is part of a wider (in the order of 15–20 km) crustal-scale shear zone, which may be responsible for strong historical earthquakes in the area.

Keywords

active faultsseismic profilesearthquakesstrike-slip faultsinner Northern Apennines
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 6 , June 2022 , pp. 853 - 872
Copyright
© The Author(s), 2022. Published by Cambridge University Press

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