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- Title
Considerations on the seismotectonics and seismogenesis of the Tiberina-Gubbio Valley extensional system (central Italy).
- Authors
Balocchi, Paolo; Riga, Giulio
- Abstract
The analysis of seismological data related to low magnitude earthquakes provides useful information on the seismotectonics and seismogenic context as well as on the seismic processes that generate seismic sequences with strong earthquakes. We analysed seismic data, related to the 1984 earthquake sequence and the 2010-2015 seismicity, and we obtained information about the history of seismic events and the associated tectonic structure activity, which allowed us to describe the seismotectonics model and seismogenic area. The geometry of the Tiberina Valley fault system that represents a detached surface of regional relevance is subject to a creep deformation along the deeper segments, which determines the evolution of the seismicity of the area. Brittle deformations with the possibility of microseismic as well as strong events are plausible in the most superficial segments. The Gubbio fault is antithetical to the preceding one, showing brittle deformation features with the possibility of developing strong earthquakes. Due to the roll-back of the subduction plane, an extensive regime was established, which led to the activation of two previous faults constraining a "wedge". Since it is subject to gravity, this wedge collapsed and created graviquakes. We propose an evolutional seismogenic model of the Tiberina-Gubbio Valley. We believe that the graviquake model can be adopted to describe the seismotectonics and seismogenesis of other Apennine areas.
- Subjects
GUBBIO (Italy); APENNINES (Italy); ITALY; EARTHQUAKES; PALEOSEISMOLOGY; SEISMOTECTONICS; PLATE tectonics
- Publication
Atti della Società dei Naturalisti e Matematici di Modena, 2017, Vol 148, p65
- ISSN
0365-7027
- Publication type
Article