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  • 2020-2023  (6)
  • 2021  (6)
  • 1
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    Progetto RETRACE-3D - centRal italy EarThquakes integRAted Crustal modEl - Rapporto Finale (2021)
    Details
    Publication Date: 2022-04-22
    Description: Il progetto RETRACE-3D (centRal italy EarThquakes integRAted Crustal modEl) è volto alla caratterizzazione tridimensionale, geologica e sismotettonica, del volume di crosta terrestre che a partire dal 24 agosto 2016 è stato interessato dai terremoti di Amatrice, Visso e Norcia, e dalla relativa sequenza sismica. Il progetto è il risultato di una collaborazione tra il Dipartimento della Protezione Civile, l’Istituto Nazionale di Geofisica e Vulcanologia (INGV), il Consiglio Nazionale delle Ricerche che partecipa con l’Istituto di Geologia Ambientale e Geoingegneria (CNR-IGAG) e l’Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR-IREA) e l’Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), con la collaborazione di Eni e Total, realtà private ma anch’esse parte del Servizio nazionale della Protezione Civile, che hanno messo a disposizione i propri dati di sottosuolo.
    Description: INGV, ISPRA, CNR-IGAG, DPC
    Description: Published
    Description: 1T. Struttura della Terra
    Description: 2T. Deformazione crostale attiva
    Description: 3T. Fisica dei terremoti e Sorgente Sismica
    Description: 4T. Sismicità dell'Italia
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 2IT. Laboratori analitici e sperimentali
    Description: 3IT. Calcolo scientifico
    Description: 4IT. Banche dati
    Keywords: Central Appennines ; 2016 seismic sequence ; Seismotectonics ; 3D geological model
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 2
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    Progetto RETRACE-3D - centRal italy EarThquakes integRAted Crustal modEl - Modello Geologico (2021)
    Details
    Publication Date: 2022-04-22
    Description: Three-dimensional geological model of the area of the central Apennines affected by the 2016-2018 seismic sequence. The model consists of stratigraphic surfaces (top or basal unconformity of units, or sequences of units, with homogeneous behavior) and main faults of the area. The stratigraphic surfaces are, from the oldest to the most recent: the top of pre-Upper Triassic units, the top of the intra-Triassic units, the top of Calcare Massiccio, the top of the Marne
    Description: INGV, ISPRA, CNR-IGAG, DPC.
    Description: Published
    Description: 1T. Struttura della Terra
    Description: 2T. Deformazione crostale attiva
    Description: 3T. Fisica dei terremoti e Sorgente Sismica
    Description: 4T. Sismicità dell'Italia
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 2TR. Ricostruzione e modellazione della struttura crostale
    Keywords: Central Appennines ; 2016 seismic sequence ; Seismotectonics ; 3D geological model
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 3
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    New trenching results along the İznik segment of the central strand of the North Anatolian Fault (Turkey): an integration with preexisting data (2021)
    Springer Nature
    Details
    Publication Date: 2021-12-06
    Description: This paper provides a new contribution to the construction of the complex and fragmentary mosaic of the Late Holocene earthquakes history of the İznik segment of the central strand of the North Anatolian Fault (CNAF) in Turkey. The CNAF clearly displays lower dextral slip rates with respect to the northern strand however, surface rupturing and large damaging earthquakes (M 〉 7) occurred in the past, leaving clear signatures in the built and natural environments. The association of these historical events to specific earthquake sources (e.g., Gemlik, İznik, or Geyve fault segments) is still a matter of debate. We excavated two trenches across the İznik fault trace near Mustafali, a village about 10 km WSW of İznik where the morphological fault scarp was visible although modified by agricultural activities. Radiocarbon and TL dating on samples collected from the trenches show that the displaced deposits are very recent and span the past 2 millennia at most. Evidence for four surface faulting events was found in the Mustafali trenches. The integration of these results with historical data and previous paleoseismological data yields an updated Late Holocene history of surface-rupturing earthquakes along the İznik Fault in 1855, 740 (715), 362, and 121 CE. Evidence for the large M7 + historical earthquake dated 1419 CE generally attributed to this fault, was not found at any trench site along the İznik fault nor in the subaqueous record. This unfit between paleoseismological, stratigraphic, and historical data highlights one more time the urge for extensive paleoseismological trenching and offshore campaigns because of the high potential to solve the uncertainties on the seismogenic history (age, earthquake location, extent of the rupture and size) of this portion of NAFZ and especially on the attribution of historical earthquakes to the causative fault.
    Description: Published
    Description: 115–128
    Description: 2T. Deformazione crostale attiva
    Description: N/A or not JCR
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    The Mediterranean Sea and the Gulf of Cadiz as a natural laboratory for paleotsunami research: Recent advancements (2021)
    Elsevier
    Details
    Publication Date: 2021-12-23
    Description: After the 2004 Indian Ocean (IOT) and the 2011 Tohoku-oki tsunamis, new research in tsunami-related fields was strongly stimulated worldwide and also in the Mediterranean. This research growth yields substantial advancements in tsunami knowledge. Among these advancements is the “Paleotsunami” research that has marked particular progress on the reconstruction of the tsunami history of a region. As an integration of the historical documentation available in the Mediterranean and the Gulf of Cadiz areas, geological and geoarchaeological records provide the insights to define the occurrence, characteristics, and impact of tsunamis of the past. Here, we present the recent advancements done for both the onshore and offshore realms. As for the onshore, we discuss case studies dealing with recent high-resolution works based on: a) direct push in situ sensing techniques, applied to identification and characterization of typical paleotsunami deposits features; b) combined XRF- X-CT approach, implemented for the identification of fine-scale sedimentary structures useful for the definition of the causative flow dynamics; c) the geoarchaeological “new field” contribution, with the development of specific diagnostic criteria in search for tsunami impact traces in archaeological strata; d) comparison of multiple dating methods and of different modeling codes for the definition of the potential source for the displacement of boulders of exceptional dimension, identified by 3D size calculation. As for the offshore advancements, we present case studies focusing on the recognition of tsunami deposits and their sedimentary traces in the geological record from the nearshore, thanks to diver-operated coring equipment, down to the continental slope, by means of vibracorer and long gravity core sampling in deeper areas. The examples provided show a multiproxy approach with a high potential of retrieving a complete record of paleotsunami traces at least during the Holocene. This is based on the combination of multidisciplinary approaches including X-ray imaging, high-resolution measurement of physical properties, X- ray fluorescence data, grain-size analysis, micropaleontology, palynological content, isotopic and optically stimulated luminescence dating methods.
    Description: Published
    Description: 103578
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: Paleotsunami deposits ; Mediterranean Sea ; High-resolution studies ; Archeology ; backwash wave ; Geology ; tsunami ; paleotsunami deposits ; Mediterranean Sea
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    High‐Resolution Seismic Profiling in the Hanging Wall of the Southern Fault Section Ruptured During the 2016 M w 6.5 Central Italy Earthquake (2021)
    Wiley-Agu
    Details
    Publication Date: 2021-11-26
    Description: The Vettore–Bove normal fault system in central Italy ruptured during the 2016 MW 6.5 Norcia earthquake causing extensive surface faulting. At the Pian Grande di Castelluccio hanging wall basin, along the southern section of the fault ruptured during the MW 6.5 mainshock, we performed a high-resolution seismic reflection/refraction experiment aimed at (a) imaging the shallow pattern of the fault system, and (b) reconstructing the architecture of the continental infill. We collected three profiles for a total length of ∼8 km. We used a reflection processing flow and non-linear refraction tomography to obtain migrated stack sections and P-wave velocity images resolved down to the depth of the pre-Quaternary substratum. The main profile in the northern part of the basin crosses the westernmost splays of the ruptured fault zone striking N150°–170°. Seismic imaging unravels a ∼1 km-wide fault zone comprising three W-throwing splays and subsidiary faults, which affect the continental infill and produce a minimum aggregate Quaternary throw of ∼400 ± 100 m. Recent deformation is localized in this part of the surveyed fault section, attesting active displacement accumulation of the Vettore–Bove fault system. The other profiles in the central-southern part of the basin show additional faults, likely striking N20°–40° and which concurred to generate a ∼500 m-deep depocenter. These faults were mostly active during an early extensional phase; however, one of them likely displaces shallow layers with a throw close to the resolution limit of seismic data (〈10 m), suggesting activity in the Late Pleistocene.
    Description: Published
    Description: e2021TC006786
    Description: 1T. Struttura della Terra
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 2TR. Ricostruzione e modellazione della struttura crostale
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    3‐D Deep Electrical Resistivity Tomography of the Major Basin Related to the 2016 Mw 6.5 Central Italy Earthquake Fault (2021)
    Wiley-Agu
    Details
    Publication Date: 2021-11-26
    Description: We provide the first 3-D resistivity image of the Pian Grande di Castelluccio basin, the main Quaternary depocenter in the hangingwall of the Mt.Vettore–Mt. Bove normal fault system (VBFS), responsible for the October 30, 2016 Mw 6.5 Norcia earthquake (central Italy). The subsurface structure of the basin is poorly known, and its relation with the VBFS remains debated. Using the recent Fullwaver technology, we carried out a high-resolution 2-D transect crossing the 2016 coseismic ruptures coupled with an extensive 3-D survey with the aim of: (a) mapping the subsurface of the basin-bounding splays of the VBFS and the downdip extent of intrabasin faults; (b) imaging the infill and pre-Quaternary substratum down to ∼1 km depth. The 2-D resistivity section highlights under the coseismic ruptures a main dip-slip fault zone with conjugated splays. The 3-D resistivity model suggests that the basin consists of two depocenters (∼300 and ∼600 m deep, respectively) filled with silty sands and gravels (resistivity 〈300 Ωm), bounded and cross-cut by NNE-, WNW-, and NNW-trending faults with throws of ∼200–400 m. We hypothesize that the NNE-trending system acted during the early basin development, followed by NNW-trending and currently active splays of the VBFS that overprint pre-existing structures and locally control the infill architecture. Moreover, beneath the basin we detect a shallow NW-dipping blind fault. The latter is likely a hangingwall splay of the adjacent regional Mts. Sibillini Thrust, which may have been partly involved in the rupture process of the Norcia mainshock.
    Description: Published
    Description: e2020TC006628
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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