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  • 1
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    Surface Faulting of the 6 April 2009 Mw 6.3 L'Aquila Earthquake in Central Italy (2011)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2011-08-01
    Description: This paper documents evidence of surface faulting associated with the 6 April 2009 moderate-sized earthquake (ML 5.8, Mw 6.3) in the central Apennines of Italy, which caused major damage to the town of L'Aquila and its surroundings. Coseismic surface ruptures were mapped for a minimum distance of 2.6 km along the Paganica fault, a fault still poorly investigated relative to the other active faults nearby, which bound much wider range fronts. Surface rupture length (SRL) and maximum displacement parameters (2.6 km minimum and 10-15 cm, respectively) are in agreement with what is expected for an Mw 6.3 event in the Italian Apennines tectonic environment. Different viewpoints exist on the amount of SRL and the number of activated faults. We propose a pattern of sympathetic and secondary slip on an array of faults around the master seismogenic structure. Past seismicity and evidence for larger Holocene offsets on this and other capable faults nearby prove that the 2009 event is not a good reference event for assessing the seismic hazard of the region. Nevertheless, the 2009 L'Aquila earthquake once more confirmed the importance of detailed geological studies for a proper seismic hazard assessment, and it clearly illustrates the need to pay attention to moderate events and supposedly minor active faults. Indeed, this type of earthquake is rather frequent in the whole Mediterranean region and is potentially much more destructive than in the past, due to the expanding urban centers and infrastructures inside their epicentral regions and even right above the traces of capable faults.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 2
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    EARTHQUAKE RUPTURE ON THE FIANDACA FAULT, DEC. 26, 2018, MW 4.9: FAULT FABRIC ANALYSIS, INTENSITY VS. SURFACE FAULTING, AND HISTORICAL SEISMICITY AT MT. ETNA VOLCANO, ITALY (2021)
    Details
    Publication Date: 2021-06-01
    Description: On December 26, 2018, a Mw 4.9 earthquake hits the eastern flank of Mount Etna volcano (Sicily). The epicenter is located between the Fleri and Pennisi villages, and focal depth is estimated at 0.3 km (http://cnt.rm.ingv.it/event/21285011). This earthquake is part of a seismic sequence begun on December 23, 2018 and a concurrent phase of volcanic eruption, eventually resulting in lava flows and a dyke intrusion (De Novellis et al., 2019).The earthquake is the result of the activation of the Fiandaca Fault; it is accompanied by widespread surface faulting and secondary environmental effects (Emergeo Working Group, 2019; Figs. 1 - 3), and have a maximum intensity of VIII EMS (Quest WG, 2019).Partial or complete ruptures of the Fiandaca Fault are well-documented in the last 150 years (Fig. 1). The last event that activated the entire structure, as happened in 2018, occurred in 1894 and generated extensive surface faulting and secondary effects (Riccò, 1894; Baratta, 1894; Imbò, 1935).Despite the abundant documentation of previous events, the Fleri earthquake represents the first opportunity to document coseismic effects of a strong, shallow seismic event at Mt. Etna through modern field techniques, sustained by accurate remote-sensed data, including unprecedented InSar measurements.
    Description: Published
    Description: ROMA
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Keywords: Mount Etna volcano ; TECTONOVOLCANIC ; SEISMICITY ; GROUND EFFECTS
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 3
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    Testing Tsunami Inundation Maps for Evacuation Planning in Italy (2021)
    Frontiers
    Details
    Publication Date: 2021-05-07
    Description: Inundation maps are a fundamental tool for coastal risk management and in particular for designing evacuation maps and evacuation planning. These in turn are a necessary component of the tsunami warning systems’ last-mile. In Italy inundation maps are informed by a probabilistic tsunami hazard model. Based on a given level of acceptable risk, Italian authorities in charge for this task recommended to consider, as design hazard intensity, the average return period of 2500 years and the 84th percentile of the hazard model uncertainty. An available, regional-scale tsunami hazard model was used that covers the entire Italian coastline. Safety factors based on analysis of run-up variability and an empirical coastal dissipation law on a digital terrain model (DTM) were applied to convert the regional hazard into the design run-up and the corresponding evacuation maps with a GIS-based approach. Since the regional hazard cannot fully capture the local-scale variability, this simplified and conservative approach is considered a viable and feasible practice to inform local coastal risk management in the absence of high-resolution hazard models. The present work is a first attempt to quantify the uncertainty stemming from such procedure. We compare the GIS-based inundation maps informed by a regional model with those obtained from a local high-resolution hazard model. Two locations on the coast of eastern Sicily were considered, and the local hazard was addressed with the same seismic model as the regional one, but using a higher-resolution DTM and massive numerical inundation calculations with the GPU-based Tsunami-HySEA nonlinear shallow water code. This study shows that the GIS-based inundation maps used for planning deal conservatively with potential hazard underestimation at the local scale, stemming from typically unmodeled uncertainties in the numerical source and tsunami evolution models. The GIS-based maps used for planning fall within the estimated “error-bar” due to such uncertainties. The analysis also demonstrates the need to develop local assessments to serve very specific risk mitigation actions to reduce the uncertainty. More in general, the presented case-studies highlight the importance to explore ways of dealing with uncertainty hidden within the high-resolution numerical inundation models, e.g., related to the crude parameterization of the bottom friction, or the inaccuracy of the DTM.
    Description: Published
    Description: 628061
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: tsunamis ; inundation maps ; early warning ; probabilistic hazard ; numerical modeling ; Italy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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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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  • 5
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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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  • 6
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    Tsunami risk management for crustal earthquakes and non-seismic sources in Italy (2021)
    SiF
    Details
    Publication Date: 2021-12-14
    Description: Destructive tsunamis are most often generated by large earthquakes occurring at subduction interfaces, but also other “atypical” sources—defined as crustal earthquakes and non-seismic sources altogether—may cause significant tsunami threats. Tsunamis may indeed be generated by different sources, such as earthquakes, submarine or coastal landslides, volcano-related phenomena, and atmospheric perturbations. The consideration of atypical sources is important worldwide, but it is especially prominent in complex tectonic settings such as the Mediterranean, the Caribbean, or the Indonesian archipelago. The recent disasters in Indonesia in 2018, caused by the Palu-Sulawesi magnitude Mw 7.5 crustal earthquake and by the collapse of the Anak-Krakatau volcano, recall the importance of such sources. Dealing with atypical sources represents a scientific, technical, and computational challenge, which depends on the capability of quantifying and managing uncertainty efficiently and of reducing it with accurate physical modelling. Here, we first introduce the general framework in which tsunami threats are treated, and then we review the current status and the expected future development of tsunami hazard quantifications and of the tsunami warning systems in Italy, with a specific focus on the treatment of atypical sources. In Italy, where the memory of historical atypical events like the 1908 Messina earthquake or the relatively recent 2002 Stromboli tsunami is still vivid, specific attention has been indeed dedicated to the progressive development of innovative strategies to deal with such atypical sources. More specifically, we review the (national) hazard analyses and their application for coastal planning, as well as the two operating tsunami warning systems: the national warning system for seismically generated tsunamis (SiAM), whose upstream component—the CAT-INGV—is also a Tsunami Service Provider of the North-eastern Atlantic, the Mediterranean and connected seas Tsunami Warning System (NEAMTWS) coordinated by the Intergovernmental Coordination Group established by the Intergovernmental Oceanographic Commission (IOC) of UNESCO, and the local warning system for tsunamis generated by volcanic slides along the Sciara del Fuoco of Stromboli volcano. Finally, we review the state of knowledge about other potential tsunami sources that may generate significant tsunamis for the Italian coasts, but that are not presently considered in existing tsunami warning systems. This may be considered the first step towards their inclusion in the national tsunami hazard and warning programs.
    Description: Published
    Description: 69–144
    Description: 8T. Sismologia in tempo reale e Early Warning Sismico e da Tsunami
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
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    Slip localization on multiple fault splays accommodating distributed deformation across normal fault complexities (2023)
    Elsevier
    Details
    Publication Date: 2023-12-21
    Description: Deformation across structural complexities such as along-strike fault bends may be accommodated by distributed faulting, with multiple fault splays working to transfer the deformation between two principal fault segments. In these contexts, an unsolved question is whether fault activity is equally distributed through time, with multiple fault splays recording the same earthquakes, or it is instead localized in time and space across the distributed faults, with earthquakes being clustered on specific fault splays. To answer this question, we studied the distributed deformation across a structural complexity of the Mt. Marine fault (Central Apennines, Italy), where multiple fault splays accommodate the deformation throughout the change in strike of the fault. Our multidisciplinary (remote sensing analysis, geomorphological-geological mapping, geophysical and paleoseismological surveys) study identified five principal synthetic and antithetic fault splays arranged over an across-strike distance of 500 m, all of which showing evidence of multiple surface-rupturing events during the Late Pleistocene-Holocene. The fault splays exhibit different and variable activity rates, suggesting that fault activity is localized on specific fault splays through space and time. Nonetheless, our results suggest that multiple fault splays can rupture simultaneously during large earthquakes. Our findings have strong implications on fault-based seismic hazard assessments, as they imply that data collected on one splay may not be representative of the behaviour of the entire fault. This can potentially bias seismic hazard calculations.
    Description: This work was realized under the agreement between the University of Chieti-Pescara (Dep. INGEO) and the National Institute of Geophysics and Vulcanology (INGV): “Ridefinizione delle Zone di Attenzione delle Faglie Attive e Capaci emerse dagli studi di microzonazione sismica effettuati nel territorio dei Centri abitati di Barete e Pizzoli in provincia de L'Aquila, interessati dagli eventi sismici verificatisi a far data dal 24 agosto 2016”, funded by the Commissioner structure for post-earthquake reconstruction of the Italian Government.
    Description: Published
    Description: 230075
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Structural geology ; Seismic Hazard ; Active faults ; Paleoseismology ; Distributed faulting ; 04.07. Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    RETRACE-3D project: a multidisciplinary collaboration to build a crustal model for the 2016-2018 central Italy seismic sequence (2021)
    OGS
    Details
    Publication Date: 2022-06-14
    Description: The RETRACE-3D project (centRal italy EarThquakes integRAted Crustal model) focused on the revision of all the available geological and geophysical data in the area interested by the 2016-2018 seismic sequence of central Italy, with the final aim to reconstruct a reliable and consistent 3D geological model of that area. It is based on a collaboration, which was framed into a formal agreement, between Dipartimento della Protezione Civile (the Italian Civil Protection Department), Istituto di Geologia Ambientale e Geoingegneria, and Istituto per il Rilevamento Elettromagnetico of the Consiglio Nazionale delle Ricerche, Istituto Nazionale di Geofisica e Vulcanologia, and Istituto Superiore per la Protezione e la Ricerca Ambientale. The agreement purpose was to develop a project aimed at the geological and seismotectonic characterisation of the crustal volume hosting that seismic sequence. We present and discuss the approach, methodology and results of the project. The 3D geological model of the study area is developed in detail down to a depth of about 12 km, and extended to the Moho based on available regional-scale information. The model is available on the RETRACE-3D project website (www.retrace3d.it).
    Description: Consiglio dei Ministri
    Description: Published
    Description: 1-18
    Description: 1T. Struttura della Terra
    Description: 2T. Deformazione crostale attiva
    Description: 4T. Sismicità dell'Italia
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Keywords: earthquake ; seismogenic faults ; inherited faults ; 3D geological model ; central Apennines
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Paleoseismological surveys for the identification of capable faults in urban areas: the case of the Mt. Marine Fault (Central Apennines, Italy). (2023)
    Details
    Publication Date: 2023-10-20
    Description: In order to constrain the Fault Displacement Hazard (FDH) of the town of Pizzoli, located 10 km NW of L’Aquila (Central Apennines, Italy), we performed two paleoseismological trenches across multiple fault splays within the hanging wall of the main Mt. Marine active normal fault. Our trenches highlighted the presence of five faults arranged both synthetic and antithetic to the main fault. The fault splays are distributed within an across-strike distance of about 500 m. Each fault segment shows evidence of repeated surface-rupturing earthquakes occurring throughout the Late Pleistocene-Holocene, proving their capability of rupturing the surface during recent earthquakes. Our study shows that multiple parallel fault splays belonging to a principal segmented fault are active during the same time interval, although the slip rates of single faults may be different through time. Our work reiterates the importance of performing paleoseismological investigation for assessing FDH in urban areas.
    Description: Published
    Description: Aix-en-Provence, France
    Description: 2T. Deformazione crostale attiva
    Keywords: Earthquake geology ; Paleoseismology ; Fault displacement hazard ; Paleosesmic investigation Mt. Marine active normal fault (Pizzoli, AQ, Italy)
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Extended abstract
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