A multi-scale approach to the recent activity of the Stradella thrust in the seismotectonic context of the Emilia Arc (northwestern Italy)

The frontal thrusts and folds of the northern Apennines - Italy - are mainly covered under the alluvial deposits of the Po Plain. Some of these structures show geological evidence of Late Quaternary activity, thus posing the need for an accurate seismic hazard assessment due to widespread housing se...

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Bibliographic Details
Published in:Tectonophysics 2023-06, Vol.857, p.229853, Article 229853
Main Authors: Tibaldi, Alessandro, de Nardis, Rita, Torrese, Patrizio, Bressan, Sofia, Pedicini, Martina, Talone, Donato, Bonali, Fabio L., Corti, Noemi, Russo, Elena, Lavecchia, Giusy
Format: Article
Language:English
Subjects:
3D fault model
Apennines
Geoelectrical survey
Holocene thrust
Italy
Seismotectonics
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Summary:The frontal thrusts and folds of the northern Apennines - Italy - are mainly covered under the alluvial deposits of the Po Plain. Some of these structures show geological evidence of Late Quaternary activity, thus posing the need for an accurate seismic hazard assessment due to widespread housing settlements, industries, lifeline infrastructures, and large towns. We present new morphostructural, geophysical, and seismological data to discuss the recent activity of the Broni-Sarmato fault, an 18 km-long outcropping section of the north-verging Stradella thrust, located 50 km south of Milan, along the Pede-Apennine thrust front (PTF) in the rear of the Emilia Arc thrust system. The new geoelectrical surveys across the fault scarp show deformation of the shallow deposits. The outcropping deformations, with a fault scarp ranging up to 25.8 m, are investigated within the seismotectonic framework of the PTF and the Emilia Arc. The analysis of the associated seismicity and new focal mechanisms highlight two seismogenic contractional volumes dipping at low-angle southwest-ward, at upper (
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2023.229853