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  • 11
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    Fossil landscapes and youthful seismogenic sources in the central Apennines: excerpts from the 24 August 2016, Amatrice earthquake and seismic hazard implications (2016)
    Details
    Publication Date: 2020-05-27
    Description: 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 preexisting 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.
    Description: The work was supported by the Project “Abruzzo” (code: RBAP10ZC8K_001; RBAP10ZC8K_003), funded by the Italian Ministry for Education, University and Research (MIUR), and by the University of Trieste, program “Finanziamenti di Ateneo per progetti scientifici – FRA 2015”, P.I. Lorenzo Bonini.
    Description: Published
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Seismogenic source ; 24 August 2016 Amatrice earthquake ; SAR ; Shallow dipping fault ; Seismic hazard ; Central Italy ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 12
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    Deep view of the Subduction-Transform Edge Propagator (STEP) fault in the Calabrian Subduction Zone (2016)
    Details
    Publication Date: 2017-04-04
    Description: The Calabrian Subduction Zone plays a key role in the evolution of the central Mediterranean in the framework of the convergence between Africa and Europe. Here, the remnants of the World’s oldest oceanic crust form a narrow NW-dipping slab passively subducting beneath the Calabrian Arc. Recently published high-resolution seismic profiles and bathymetric data of the western Ionian Sea highlight the presence of a NNW-SSE faulting system connected with a series of Plio-Pleistocene syn-tectonic basins. These features are correlated with the recent activity of a major NNW-SSE deformation zone confining the active subduction to the SW and interpreted as a Subduction-Transform Edge Propagator (STEP) fault. The goal of this work is to jointly reconstruct the geometry of the STEP fault and the subduction interface in its surroundings.We use multichannel seismic profiles acquired in the southwestern part of the Calabrian accretionary wedge to focus on the STEP fault geometry at depth and to analyse its relationships with shallow deformation features. The quantitative analysis and enhancement of seismic data provided an accurate image of the internal structure of the accretionary wedge at various depths, showing growth strata in the Plio-Pleistocene succession and major discontinuities in the lower crust. Our results depict a main subvertical, slightly east-dipping, lithospheric fault cutting the oceanic crust down to the Moho, and a rich set of associated secondary synthetic and antithetic faults. This picture also provides new insights on the STEP fault propagation mechanism. In addition, the tridimensional correlation of the STEP fault occurrences in various seismic profiles provides a preliminary scheme of its segmentation and highlights the relationships of this master fault with other main structural elements of the Calabrian Arc and Eastern Sicily, including some of the faults deemed to be responsible for major historical earthquakes in the area.
    Description: Multichannel seismic reflection surveys in the Ionian sea are kindly provided by Spectrum under a Confidentiality Agreement (CA-60) with INGV. CROP seismic profiles are provided by CNR-ISMAR. The bathymetric Digital Terrain Model is derived from the EMODnet Bathymetry portal - http://www.emodnet-bathymetry.eu. Midland Valley Ltd is acknowledged for making available the Move software to INGV under Academic Software Initiative (ASI). Ornella Curatolo is acknowledged for the graphic design (http://www.ornellaflora.com) This poster benefits from the financial support of RITMARE, Porto Empedocle, and PON Massimo Projects
    Description: Unpublished
    Description: Vienna (AT)
    Description: 2T. Tettonica attiva
    Description: open
    Keywords: STEP ; Subduction ; Active tectonics ; Transform fault ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 13
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    Three-dimensional modelling of the Calabrian Subduction interface (2017)
    Details
    Publication Date: 2017-04-04
    Description: The Calabrian Arc is a one-of-a-kind subduction zone. It features one of the shortest subduction segment (〈150 km), one of the thickest accretionary wedge, and the oldest subducted (280 Myr) oceanic crust of the World. Despite a convergence rate of 1-5 mm/yr and significant in-slab seismicity below 40 km depth, its shallow interface shows no sign of seismic activity. Nonetheless, it has occasionally be blamed to have generated some past large earthquakes and tsunamis. For all these reasons, the Calabrian Arc is a cornerstone in the Mediterranean plate-tectonics puzzle and the understanding of its geometry and behavior may strongly contribute to estimating the seismic and tsunami hazard in the region. This work presents a 3D reconstruction of the shallow portion (〈20 Km) of the Calabrian Subduction interface based on the interpretation of ca. 60 seismic reflection profiles, and its tentative connection with the deeper slab (〉 40 km), constrained by the seismicity distribution. The seismic profiles were mostly provided in the collaborative framework between Spectrum and INGV (CA-60). The three-dimensional reconstruction highlights the detailed geometry and roughness of the subduction interface. Of particular interest is also the western lateral boundary of the subduction interface where a STEP-like fault system has been characterized in detail.
    Description: Published
    Description: San Francisco, CA, USA
    Description: 2T. Tettonica attiva
    Description: open
    Keywords: Subduction interface ; 3D modelling ; Seismic interpretation ; Calabrian Arc ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 14
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    Una metodologia di indagine basata su tecniche NDT per la mitigazione del rischio sismico di beni storici soggetti a tutela (2015)
    AIPND - Associazione Italiana delle Prove Non Distruttive
    Details
    Publication Date: 2021-09-03
    Description: Sommario In questo lavoro viene presentata una metodologia di indagine NDT (acronimo inglese di Non Destructing Testing), basata su tecniche classiche di misura, telerilevamento prossimale e satellitare ad alta risoluzione spaziale, analisi sismogenetiche ed indagini geofisiche, per la mitigazione del rischio sismico di edifici storici monumentali soggetti a tutela. I risultati sperimentali, ottenuti per il caso di studio del complesso monumentale di Sant’Agostino ubicato nella città di Cosenza, dimostrano l’efficacia dell’approccio proposto sia per applicazioni correnti (il monitoraggio materiale e strutturale di un manufatto), sia per applicazioni emergenti (mitigazione del rischio sismico di beni storici).
    Description: Il presente lavoro è finanziato dal Ministero dell'Università, dell'Istruzione e della Ricerca (MIUR) nell'ambito del programma PON R&C 2007-2013 che finanzia al 100% il progetto PON "MASSIMO"-"Monitoraggio in Area Sismica di Sistemi Monumentali"
    Description: Published
    Description: 44-57
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: N/A or not JCR
    Description: restricted
    Keywords: metodologia di indagine ; tecniche NDT ; rischio sismico ; beni storici ; tutela ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 15
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    Imaging the tectonic framework of the 24 August 2016, Amatrice (central Italy) earthquake sequence: new roles for old players? (2016)
    Istituto Nazionale di Geofisica e Vulcanologia
    Details
    Publication Date: 2021-12-16
    Description: 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.
    Description: Published
    Description: 1-10
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: 2016 Amatrice earthquake ; Sibillini thrust ; normal faulting ; extensional reactivation ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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