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  • 1
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    Intermittent Slip Along the Alto Tiberina Low‐Angle Normal Fault in Central Italy (2021)
    Wiley Agu
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    Publikationsdatum: 2021-01-11
    Beschreibung: The Alto Tiberina normal fault (ATF) in central Italy is a 50-km-long crustal structure that dips at a low angle (15–20◦). Events on the fault plane are about 10 times less frequent than those located in its shallower syn- and antithetic hanging-wall splays. To enhance ATF catalog and achieve a better understanding of the degree of coupling in the fault system, we apply a template matching technique in the 2010–2014 time window.We augment by a factor 5 the detections and decrease the completeness magnitude to negative values. Contrary to what previously observed on ATF, we highlight intermittent seismic activity and long-lasting clusters interacting with sequences on the shallower splays. One of these episodes of prolonged seismic activity, detected at the end of 2013 on a 30-km-long ATF segment, suggest the ATF active role during an aseismic transient unraveled by geodetic data.
    Beschreibung: Published
    Beschreibung: e2020GL089039
    Beschreibung: 2T. Deformazione crostale attiva
    Beschreibung: JCR Journal
    Schlagwort(e): 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 2
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    A Large Paleoearthquake in the Central Apennines, Italy, Recorded by the Collapse of a Cave Speleothem (2021)
    Wiley Agu
    Details
    Publikationsdatum: 2021-05-12
    Beschreibung: Speleoseismological research carried out in the Central Apennines (Italy) contributed to understanding the behavior of active normal faults that are potentially able to generate Mw 6.5–7 earthquakes documented by paleoseismology and by historical and instrumental seismology. Radiometric (U‐Th, AMS‐14C, and bulk‐14C) dating of predeformation and postdeformation layers from collapsed speleothems found in Cola Cave indicates that at least three speleoseismic events occurred in the cave during the last ~12.5 ka and were ostensibly caused by seismic slip on one or more of the active faults located in the region surrounding the cave. We modeled the collapse of a tall (173 cm high) stalagmite to find a causative association of this event with one among the potential seismogenic sources. We defined the uniform hazard spectrum (UHS) for each seismogenic source at the site, and we used the calculated spectra in a deterministic approach to study the behavior of the speleothem, through a numerical finite element modeling (FEM). Although our analysis suggests the “Liri” fault as the most likely source responsible for the ground shaking recorded in the cave, the “Fucino” fault system, responsible for a Mw 7 earthquake in 1915, cannot be excluded as a potential source of speleoseismic damage. Results of this work provide new constraints on the seismotectonic history of this sector of Central Apennines and highlight the performance of integrated speleoseismological, seismic hazard, and numerical studies.
    Beschreibung: Published
    Beschreibung: e2020TC006289
    Beschreibung: 6T. Studi di pericolosità sismica e da maremoto
    Beschreibung: JCR Journal
    Schlagwort(e): Speleoseismology ; Central Apennines ; seismic hazard ; finite element modeling ; 04.04. Geology ; 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 3
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    Combined Seismic and Geodetic Analysis Before, During, and After the 2018 Mount Etna Eruption (2021)
    Wiley Agu
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    Publikationsdatum: 2021-01-05
    Beschreibung: In December 2018, Etna volcano experienced one of the largest episodes of unrest since the installation of geophysical monitoring networks in 1970. The unrest culminated in a short eruption with a small volume of lava erupted, a significant seismic crisis and deformation of the entire volcanic edifice of magnitude never recorded before at Mount Etna. Here we describe the evolution of the 2018 eruptive cycle from the analysis of seismic and geodetic data collected in the months preceding, during, and following the intrusion. We model the space‐time evolution of high‐rate deformation data starting from the active source previously identified from deformation data and the propagation of seismicity in a 3‐D velocity model. The intrusion model suggests emplacement of two dikes: a smaller dike located beneath the eruptive fissure and a second, deeper dike between 1 and 5 kmbelow sea level that opened ~2 m. The rise and eruption of magma from the shallower dike did not interrupt the pressurization of a long‐lasting deeper reservoir (~6 km) that induced continuous inflation and intense deformation of the eastern flank. Shortly after the intrusion, on 26 December 2018, aML4.8 earthquake occurred near Pisano, destroying buildings and roads in two villages. We propose a time‐dependent intrusion model that supports the hypothesis of the inflation inducing flank deformation and that this process has been active since September 2018.
    Beschreibung: Published
    Beschreibung: e2020GC009218
    Beschreibung: 2V. Struttura e sistema di alimentazione dei vulcani
    Beschreibung: JCR Journal
    Schlagwort(e): 2018 Mount Etna Eruption, time‐dependent intrusion model, modelling of high‐rate deformations ; 04.08. Volcanology ; 04.03. Geodesy ; 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 4
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    New insights into active tectonics and seismogenic potential of the Italian Southern Alps from vertical geodetic velocities (2020)
    Copernicus
    Details
    Publikationsdatum: 2020-09-07
    Beschreibung: This study presents and discusses horizontal and vertical geodetic velocities for a low strain rate region of the south Alpine thrust front in northeastern Italy obtained by integrating GPS, interferometric synthetic aperture radar (InSAR) and leveling data. The area is characterized by the presence of subparallel, south-verging thrusts whose seismogenic potential is still poorly known. Horizontal GPS velocities show that this sector of the eastern Southern Alps is undergoing ∼1 mm a−1 of NW–SE shortening associated with the Adria–Eurasia plate convergence, but the horizontal GPS velocity gradient across the mountain front provides limited constraints on the geometry and slip rate of the several subparallel thrusts. In terms of vertical velocities, the three geodetic methods provide consistent results showing a positive velocity gradient, of ∼ 1.5 mm a−1, across the mountain front, which can hardly be explained solely by isostatic processes. We developed an interseismic dislocation model whose geometry is constrained by available subsurface geological reconstructions and instrumental seismicity. While a fraction of the measured uplift can be attributed to glacial and erosional isostatic processes, our results suggest that interseismic strain accumulation at the Montello and the Bassano–Valdobbiadene thrusts it significantly contributing to the measured uplift. The seismogenic potential of the Montello thrust turns out to be smaller than that of the Bassano–Valdobbiadene fault, whose estimated parameters (locking depth equals 9.1 km and slip rate equals 2.1 mm a−1) indicate a structure capable of potentially generating a Mw〉6.5 earthquake. These results demonstrate the importance of precise vertical ground velocity data for modeling interseismic strain accumulation in slowly deforming regions where seismological and geomorphological evidence of active tectonics is often scarce or not conclusive.
    Beschreibung: Published
    Beschreibung: 1681–1698
    Beschreibung: 2T. Deformazione crostale attiva
    Beschreibung: JCR Journal
    Schlagwort(e): Southern Alps ; Vertical Velocities ; GPS and InSAR integration ; Interseismic Deformation ; Dislocation Model ; Seismic Potential ; 04.03. Geodesy ; 04.07. Tectonophysics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 5
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    INSTANCE – the Italian seismic dataset for machine learning (2021)
    Copernicus
    Details
    Publikationsdatum: 2021-12-14
    Beschreibung: The Italian earthquake waveform data are collected here in a dataset suited for machine learning analysis (ML) applications. The dataset consists of nearly 1.2 million three-component (3C) waveform traces from about 50 000 earthquakes and more than 130 000 noise 3C waveform traces, for a total of about 43 000 h of data and an average of 21 3C traces provided per event. The earthquake list is based on the Italian Seismic Bulletin (http://terremoti.ingv.it/bsi, last access: 15 February 2020​​​​​​​) of the Istituto Nazionale di Geofisica e Vulcanologia between January 2005 and January 2020, and it includes events in the magnitude range between 0.0 and 6.5. The waveform data have been recorded primarily by the Italian National Seismic Network (network code IV) and include both weak- (HH, EH channels) and strong-motion (HN channels) recordings. All the waveform traces have a length of 120 s, are sampled at 100 Hz, and are provided both in counts and ground motion physical units after deconvolution of the instrument transfer functions. The waveform dataset is accompanied by metadata consisting of more than 100 parameters providing comprehensive information on the earthquake source, the recording stations, the trace features, and other derived quantities. This rich set of metadata allows the users to target the data selection for their own purposes. Much of these metadata can be used as labels in ML analysis or for other studies. The dataset, assembled in HDF5 format, is available at http://doi.org/10.13127/instance (Michelini et al., 2021).
    Beschreibung: Published
    Beschreibung: 5509–5544
    Beschreibung: 4T. Sismicità dell'Italia
    Beschreibung: JCR Journal
    Schlagwort(e): 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 6
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    Seismotectonics at the Transition Between Opposite‐Dipping Slabs (Western Alpine Region) (2021)
    Wiley Agu
    Details
    Publikationsdatum: 2023-11-16
    Beschreibung: We analyze a fully reprocessed data set of ~9,000 seismic events recorded in the western Alpine region during the past 30 yr, in order to understand how convergence between Africa and Eurasia is presently accommodated at the transition between the opposite‐dipping Alpine and Apenninic slabs. We confirm that seismicity in the Internal Zone of the Western Alps is clustered along two different arcs (Briançonnais and Piedmont arcs), clearly outlined by events in the 0–12 km depth range. The Piedmont Arc is best outlined by events in the 12–30 km depth range, forming a narrow belt that matches the shape and location of the Ivrea gravity anomaly. In the Internal Zone, σ3, is oblique to the orogen trend. Although the mountain range is spreading gravitationally at a shallow level, spreading occurs intermittently with other earthquakes that are more directly related to plate interactions. Strike‐slip solutions are predominant for events of magnitude Ml 〉 4, and reverse solutions are dominant along the Piedmont Arc for events of magnitude Ml 〈 4. Nodal planes have dominant NNW‐SSE and ENE‐WSW orientations that are common to major faults mapped in the study area. Integration with available tectonic and geodynamic constraints indicates that lithology distribution in the subduction wedge, orientation of major faults within and outside the subduction zone, and the exhumation of mantle rocks at shallow depth concurrently determine a complex seismotectonic scenario that may be expected in other subduction zones worldwide.
    Beschreibung: Published
    Beschreibung: e2020TC006086
    Beschreibung: 1T. Struttura della Terra
    Beschreibung: JCR Journal
    Schlagwort(e): Seismotectonics ; Adria-Europa plate boundary ; opposite-dipping slabs ; exhumed mantle wedge ; tectonic inheritance ; 04.06. Seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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