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Analisi di pericolosit�� da tsunami indotti da terremoti per il sito Versalis di Porto Torres (SS) Studio svolto nell���ambito della convenzione per attivit�� scientifica conto terzi commissionata da RINA Consulting S.p.A. all���Istituto Nazionale di Geofisica e Vulcanologia (INGV) avente per oggetto ���la valutazione della pericolosit�� da tsunami su tre (3) siti Versalis di interesse industriale ubicati lungo le coste italiane, in particolare quelli di Priolo Gargallo, Porto Torres e Brindisi���.

Analisi di pericolosit�� da tsunami indotti da terremoti per il sito Versalis di Brindisi Studio svolto nell���ambito della convenzione per attivit�� scientifica conto terzi commissionata da RINA Consulting S.p.A. all���Istituto Nazionale di Geofisica e Vulcanologia (INGV) avente per oggetto ���la valutazione della pericolosit�� da tsunami su tre (3) siti Versalis di interesse industriale ubicati lungo le coste italiane, in particolare quelli di Priolo Gargallo, Porto Torres e Brindisi���.

Analisi di pericolosit�� da tsunami indotti da terremoti per il sito Versalis di Priolo Gargallo (SR) Studio svolto nell���ambito della convenzione per attivit�� scientifica conto terzi commissionata da RINA Consulting S.p.A. all���Istituto Nazionale di Geofisica e Vulcanologia (INGV) avente per oggetto ���la valutazione della pericolosit�� da tsunami su tre (3) siti Versalis di interesse industriale ubicati lungo le coste italiane, in particolare quelli di Priolo Gargallo, Porto Torres e Brindisi���.

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Il progetto SPOT (Sismicità Potenzialmente innescabile Offshore e Tsunami) è stato sviluppato con lo scopo di supportare le Autorità italiane nell'applicazione della Direttiva Europea sulla sicurezza delle operazioni in mare nel settore degli idrocarburi (2013/30/EU), su fondi di cui art. 35 del Decreto Legge 83/2012, e dei decreti italiani che ne derivano (Antoncecchi et al., 2019). Il progetto, della durata di 21 mesi, è stato ideato e finanziato dal Ministero dello Sviluppo Economico italiano – Direzione Generale per la sicurezza delle attività minerarie ed energetiche (DGS-UNMIG) nell’ambito della rete di ricerca CLYPEA, con il supporto tecnico del Dipartimento della Protezione Civile nazionale. Attività svolta nell'ambito del programma CLYPEA - Innovation Network for Future Energy, finanziato dal Ministero dello Sviluppo Economico su fondi per la "sicurezza offshore" ai sensi dell'art.35 D.L. 83/2012., Ministero dello sviluppo economico DGS-UNMIG Direzione generale per la sicurezza anche ambientale delle attività minerarie ed energetiche Ufficio nazionale minerario per gli idrocarburi e le georisorse Palazzo Piacentini - Via Veneto, 33 - 00187 Roma Tel. (+39) 06 4705 2859 Fax. (+39) 06 4788 7802 Email: dgsunmig.segreteria@mise.gov.itPEC: dgsunmig.dg@pec.mise.gov.it

Gruppo composto da ricercatori e tecnologi di diversi enti di ricerca italiani con competenze sull’analisi di dati geologici di superficie e di sottosuolo per la ricostruzione di un modello geologico dell'area interessata dalla sequenza sismica del 24 agosto

Tear faults are common structures in subduction zones, especially at slab edges, where they origin from differential forces applied to a subducting slab in areas close to the trench. Presence and geometry of tears have been sometimes inferred from bathymetric features, suggesting the abrupt lateral termination of the subduction zone.Differential forces acting at the subduction boundaries can be related to different mechanisms, such as slab retreat, differential velocities along plate margins, complex mantle flow, differential lateral rheology. As a result, plates down-warp and tear in a scissor-like motion, with both strike-slip and dip-slip kinematics.The goal of this work is to gain insights into the evolution of tear faults by adopting an analogue modelling approach and comparing the results with natural cases. In particular, we focus on the bathymetric observation made in subduction zones where the upper plate accretionary wedge is not well developed. Two scenarios were considered: 1) tear faults nucleating and evolving in a homogeneous setting, i.e. without large mechanical discontinuities (e.g., Tonga subduction zone); and 2) tear faults reactivating pre-existing strike-slip faults as an analogue of transform faults (e.g., South Sandwich subduction zone).The experimental apparatus was designed to reproduce the lateral propagation of a tear fault using two blocks: one entirely flat and the other with an inclined plane. Wet kaolin acts as the analogue of the intact rocks above a propagating tear fault.Our results revealed different evolutionary processes: in the homogeneous setting, the tear fault generates a symmetric subsidence zone with an axis perpendicular to the fault zone and a depocenter located in the centre; in the second case, the depocenter is located in front of the fault plane and the subsidence zone is asymmetric. Both cases depict a symmetrical Gaussian shape of the displacement profile, with the maximum displacement located at the centre of the fault. However, the maximum slip (Dmax) and the fault length (L) are both larger in the experiment involving a strong re-activation of the strike-slip fault than those in the case of the homogeneous setting.

We show and discuss the similarities among the 2016 Amatrice (Mw 6.0), 1997 Colfiorito-Sellano (Mw 6.0-5.6) and 2009 L’Aquila (Mw 6.3) earthquakes. They all occurred along the crest of the central Apennines and were caused by shallow dipping faults between 3 and 10 km depth, as shown by their characteristic InSAR signature. We contend that these earthquakes delineate a seismogenic style that is characteristic of this portion of the central Apennines, where the upward propagation of seismogenic faults is hindered by the presence of pre-existing regional thrusts. This leads to an effective decoupling between the deeper seismogenic portion of the upper crust and its uppermost 3 km.The decoupling implies that active faults mapped at the surface do not connect with the seismogenic sources, and that their evolution may be controlled by passive readjustments to coseismic strains or even by purely gravitational motions. Seismic hazard analyses and estimates based on such faults should hence be considered with great caution as they may be all but representative of the true seismogenic potential.

We reconstruct the tectonic framework of the 24 August 2016, Amatrice earthquake. At least three main faults, including an older thrust fault (Sibillini Thrust), played an active role in the sequence. The mainshock nucleated and propagated along an extensional fault located in the footwall of the Sibillini Thrust, but due to the preliminary nature of the data the role of this thrust is still unclear. We illustrate two competing solutions: 1) the coseismic rupture started along an extensional fault and then partially used the thrust plane in extensional motion; 2) the thrust fault acted as an upper barrier to the propagation of the mainshock rupture, but was partially reactivated during the aftershock sequence. In both cases our tectonic reconstruction suggests an active role of the thrust fault, providing yet another example of how structures inherited from older tectonic phases may control the mainshock ruptures and the long-term evolution of younger seismogenic faults.