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  • 04. Solid Earth
  • Volcano seismology
  • Wiley  (6)
  • INGV  (3)
  • Nature PG  (2)
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  • 1
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    Coupled U–Pb and 40Ar/39Ar chronology of late‐stage intrusions at Elba Island (Italy) supports late Miocene long‐lived magma reservoirs in the Tyrrhenian upper crust (2024)
    Wiley
    Details
    Publication Date: 2024-03-12
    Description: The late Miocene Monte Capanne and Porto Azzurro plutons are investigated by means of coupled U-Pb zircon and 40Ar/39Ar white mica dating to test the occurrence of long-lived magmatic systems in the upper crust. Zircon crystallized for 〉 1 Myr in both plutonic systems, with supersolidus conditions overlapping for ~220 kyr indicating previously unrecognized co-existence of the two reservoirs. The development of the Porto Azzurro high T-aureole is post-dated by continuous igneous zircon crystallization until ~ 6.0 Ma. By linking crystallization to post-emplacement cooling of late-stage pulses in both western and eastern Elba we constrain long-lived sizeable reservoirs (possibly the same reservoir) in the Tyrrhenian upper crust between ~8 and 6 Ma.
    Description: In press
    Description: OST1 Alla ricerca dei Motori Geodinamici
    Description: JCR Journal
    Keywords: 40Ar/39Ar white mica dating ; Elba Island ; long-lived magma reservoirs ; U–Pb zircon dating ; MioceneTyrrhenian crust ; upper crustal granites ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Subduction age and stress state control on seismicity in the NW Pacific subducting plate (2022)
    Nature PG
    Details
    Publication Date: 2022-08-23
    Description: Intermediate depth (70-300 km) and deep (〉300 km) earthquakes have always been puzzling Earth scientists: their occurrence is a paradox, since the ductile behavior of rocks and the high confining pressure with increasing depths would theoretically preclude brittle failure and frictional sliding. The mechanisms proposed to explain deep earthquakes, mainly depending on the subducting plate age and stress state, are generally expressed by single parameters, unsuitable to comprehensively account for differences among distinct subduction zones or within the same slab. We analyze the Kurile and Izu-Bonin intraslab seismicity and detail the stress state along the subducted planes using the Gutenberg-Richter b-value. We demonstrate that, despite the slabs different properties (e.g., lithospheric age, stress state, dehydration rate), in both cases deep earthquakes are restricted to depths characterized by equal age from subduction initiation and are driven by stress regimes affected by the persistence of the metastable olivine wedge.
    Description: Published
    Description: 12440
    Description: 3T. Fisica dei terremoti e Sorgente Sismica
    Description: JCR Journal
    Keywords: Subduction ; Gutenberg-Richter b value ; Metastable olivine wedge ; NW Pacific ; 04. Solid Earth ; 04.06. Seismology ; 04.07. Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    La formazione del Personale della Sala di Sorveglianza Sismica e Allerta Tsunami di Roma (2022)
    INGV
    Details
    Publication Date: 2022-06-06
    Description: Miscellanea INGV - Progetto “Sale Operative Integrate e Reti di monitoraggio del futuro: l’INGV 2.0”. Report finale
    Description: L’INGV è Centro di Competenza per i fenomeni sismici, vulcanici e i maremoti per il Dipartimento di Protezione Civile Nazionale (DPC). Nell’ambito delle attività previste dall’Accordo Quadro DPCINGV 20122021 (AQ vigente), l’INGV svolge attività di sorveglianza tecnicoscientifica sulla sismicità del territorio nazionale, sui fenomeni vulcanici e sui maremoti, finalizzata ai compiti di protezione civile, in modo ininterrotto (H24 per 365 giorni l’anno). Tale attività viene realizzata con uno specifico assetto organizzativo, che consente la trasmissione in tempo reale verso il DPC di tutte le informazioni riguardanti eventi e rischi sismici, vulcanici e da maremoto di interesse per il Dipartimento stesso. La sorveglianza sismica del territorio nazionale e delle aree limitrofe è in carico all’Osservatorio Nazionale Terremoti (ONT), insieme alle comunicazioni relative agli eventi in area mediterranea e nel mondo. La sorveglianza delle aree vulcaniche campane (Campi Flegrei, Ischia, Vesuvio) e siciliane (Etna, Stromboli, Vulcano, altre isole Eolie, Pantelleria) sono rispettivamente in carico all’Osservatorio Vesuviano (OV) e all’Osservatorio Etneo (OE). Dal gennaio 2017 è diventata ufficialmente operativa anche l’attività di monitoraggio e il Servizio di allerta dei maremoti di origine sismica (Centro Allerta Tsunami CAT) con l’introduzione nella Sala INGV di Roma di una nuova unità di personale. In fase sperimentale, fino alla fine del 2016, e per i primi mesi di operatività, il personale per il Servizio di Allerta Tsunami è stato scelto all’interno del gruppo di turnisti che da anni svolgeva il Servizio di Sorveglianza Sismica; successivamente, è stato reclutato e formato nuovo personale in grado di svolgere entrambi i Servizi. A partire dal 2017 e nei due anni successivi sono stati attivati, quindi, i corsi per la formazione di nuovi Turnisti e Funzionari per i servizi di Sorveglianza Sismica e di Allerta Tsunami ed anche per i reperibili di Sala [Quintiliani et al., 2020]. La formazione del personale che partecipa al Servizio di Sorveglianza Sismica è prevista nei Piani di attività annuali relativi all’Allegato A dell’AQ vigente, tematica “Sorveglianza sismica” e quella del personale che partecipa alle attività del CAT nella tematica “Centro Allerta Tsunami (CAT)”. Inoltre, il Progetto “S.O.I.R. monitoraggio futuro” ha tra le sue finalità quella della formazione del personale delle Sale Operative INGV, essendo il WP4 “Formazione” uno dei sei working package del progetto espressamente dedicato a questo.
    Description: Published
    Description: 150-155
    Description: 1SR TERREMOTI - Sorveglianza Sismica e Allerta Tsunami
    Description: N/A or not JCR
    Keywords: Formazione turnisti ; Servizio di Sorveglianza Sismica e Allerta Tsunami di Roma ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Preliminary geochemical characterization of the Mts. Simbruini karst aquifer (Central Italy) (2022)
    INGV
    Details
    Publication Date: 2022-02-25
    Description: Mts. Simbruini karst aquifer feeds important springs whose capture contributes to the water supply of Rome City. To improve the geochemical characterization of this aquifer, we analyzed 36 groundwater samples, 29 from springs and 7 from shallow wells, collected in 1996 and 2019. Atomic adsorption spectroscopy, titration, ionic chromatography and mass spectrometry were the used analytical methods. Groundwater is bicarbonate alkaline-earth type and HCO3- dominance confirms that the aquifer is hosted in carbonate rocks. Total alkalinity vs. cations plot indicates that CO2 driven weathering controls the water chemistry. The probability plots of HCO3-, cations and Ca2+ +Mg2+ indicate four groundwater populations with the less represented one (9 samples)characterized by the highest PCO2 values (〉 0.3 atm). Most anomalous values of the dissolved PCO2are from springs located near the center of the studied area. Four samples have negative values of𝛿13CCO2 (about -22‰ vs. PDB), indicating its organic origin, but two other samples have positivevalues (1.6 and 2.6 ‰ vs. PDB), similar to those observed in the CO2 of deep origin discharged atthe close Colli Albani volcano. Therefore, geochemical evidence indicates that the Mts. Simbruiniaquifer is locally affected by the input of deep originated CO2, likely rising up along fractures, interacting with a recharge of meteoric origin, as evidenced by its 𝛿2H and 𝛿18O isotopic signatures.
    Description: Published
    Description: HS659
    Description: 1TR. Georisorse
    Description: JCR Journal
    Keywords: Water resources ; Groundwater processes ; Chemistry of waters ; Hydrological processes: interaction, transport, dynamics; ; Fluid Geochemistry ; 04. Solid Earth ; 03.02. Hydrology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    The contribution of the NEMO-SN1 seafloor observatory to improve the seismic locations in the Ionian Sea (Italy) (2021)
    INGV
    Details
    Publication Date: 2021-12-22
    Description: The Western Ionian Sea is characterised by an active and diffuse seismicity, directly related to the convergence of the European and African Plates and by gravitational sinking and rollback of the oceanic lithosphere. In this area, the location of earthquakes is characterised by considerable uncertainties due to large azimuthal gaps, resulting in notable location errors. This problem was partially overcome with the use of data recorded by NEMO-SN1 seafloor observatory (October 2002 - February 2003; June 2012 - May 2013). We relocated 1130 crustal and sub-crustal earthquakes using land network and NEMO-SN1 data. As most events occurred on Mt. Etna, we focused on 358 earthquakes in the offshore area and near the coasts of Sicily and Calabria. The use of the combined land-marine networks has improved the earthquake locations in terms of azimuthal GAP, as well as in horizontal and vertical errors. The comparison between locations performed with and without NEMO-SN1 data shows that differences in latitude, longitude and depths are more evident in the Western Ionian Sea and in the coast of Sicily, where values of the differences over 5 km correspond to structural heterogeneities. The increased number of seismic stations deployed on land from 2003 to 2012 did not influence the location of events occurring offshore, where NEMO-SN1 continued to be the distinctive tool in the location process. Moreover, the new 73 focal mechanisms computed with P-wave polarities from NEMO-SN1 and land stations are in agreement with the regional structural model, showing a prevalent normal, normal/oblique, and strike-slip kinematics. The similarity of two new focal solutions with the mechanisms of the main shock and aftershock of the 1990 earthquake demonstrates that the seismic structures are still active and potentially dangerous. The P-wave travel time residual analysis confirms the activity along the main structural alignments. A single point of observation in the Ionian Sea can significantly improve the quality of locations, giving an opportunity to focus on the seismogenic structures responsible for the occurrence of medium-to-high magnitude earthquakes.
    Description: Published
    Description: Se655
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Earthquake location ; Focal mechanisms ; Tectonic and volcanic structures ; NEMO-SN1 seafloor observatory ; Ionian Sea ; 04. Solid Earth ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
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    The Pisciarelli main fumarole mechanisms reconstructed by electrical resistivity and induced polarization imaging (2021)
    Nature PG
    Details
    Publication Date: 2021-12-16
    Description: Pisciarelli, together with the adjacent Solfatara maar-diatreme, represents the most active structure of the Campi Flegrei caldera (Italy) in terms of degassing and seismic activity. This paper aims to define the structure of the Pisciarelli hydrothermal system (down to a 20 m depth) through electrical resistivity and time-domain-induced polarization tomography and self-potential mapping. The retrieved 3D image of the area helps reconstruct the Pisciarelli subsurface in its area of maximum degassing, containing the main fumarole ("soffione") and the mud pool. In particular, a channel has been identified in which fluids stored in a deeper reservoir rise toward the surface. Such a structure seems to be surmounted by a clay-cap formation that could govern the circulation of fluids and the abundance of gases/vapors emitted by the soffione. Based on this new reconstruction of the Pisciarelli fumarolic field structural setting, the first conceptual model has been suggested that is capable of simultaneously explaining the mechanisms governing soffione activity and elucidating the role played by the fluid/gas of deeper origin in the shallow fluid circulation system. The proposed model can potentially help to better monitor the processes occurring throughout the Pisciarelli fumarolic field and provide an evaluation of the associated hazards.
    Description: Published
    Description: 18639
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: JCR Journal
    Keywords: Campi Flegrei caldera ; Pisciarelli fumarolic field ; electrical resistivity imaging ; induced polarization imaging ; 04. Solid Earth ; 04.02. Exploration geophysics ; 04.08. Volcanology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    New insights into fault activation and stress transfer between en echelon thrusts: The 2012 Emilia, Northern Italy, earthquake sequence (2018)
    Wiley
    Details
    Publication Date: 2021-05-17
    Description: Here we present the results of the inversion of a new geodetic data set covering the 2012 Emilia seismic sequence and the following 1 year of postseismic deformation. Modeling of the geodetic data together with the use of a catalog of 3-D relocated aftershocks allows us to constrain the rupture geometries and the coseismic and postseismic slip distributions for the two main events (Mw 6.1 and 6.0) of the sequence and to explore how these thrust events have interacted with each other. Dislocation modeling reveals that the first event ruptured a slip patch located in the center of the Middle Ferrara thrust with up to 1 m of reverse slip. The modeling of the second event, located about 15 km to the southwest, indicates a main patch with up to 60 cm of slip initiated in the deeper and flatter portion of the Mirandola thrust and progressively propagated postseismically toward the top section of the rupture plane, where most of the aftershocks and afterslip occurred. Our results also indicate that between the two main events, a third thrust segment was activated releasing a pulse of aseismic slip equivalent to a Mw 5.8 event. Coulomb stress changes suggest that the aseismic event was likely triggered by the preceding main shock and that the aseismic slip event probably brought the second fault closer to failure. Our findings show significant correlations between static stress changes and seismicity and suggest that stress interaction between earthquakes plays a significant role among continental en echelon thrusts.
    Description: Published
    Description: 4742–4766
    Description: 1T. Deformazione crostale attiva
    Description: 2T. Sorgente Sismica
    Description: 3T. Storia Sismica
    Description: JCR Journal
    Keywords: continental tectonics ; source geometry ; geodetic modeling ; coulomb stress ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    New Applications in Gas Geochemistry (2021)
    Wiley
    Details
    Publication Date: 2021-02-03
    Description: Gases present in the Earth crust are important in various branches of human activities. Hydrocarbons are a significant energy resource, helium is applied in many high-tech instruments, and studies of crustal gas dynamics provide insight in the geodynamic processes and help monitor seismic and volcanic hazards. Quantitative analysis of methane and CO2 migration is important for climate change studies. Some of them are toxic (H2S, CO2, CO); radon is responsible for the major part of human radiation dose. The development of analytical techniques in gas geochemistry creates opportunities of applying this science in numerous fields. Noble gases, hydrocarbons, CO2, N2, H2, CO, and Hg vapor are measured by advanced methods in various environments and matrices including fluid inclusions. Following the “Geochemical Applications of Noble Gases”(2009), “Frontiers in Gas Geochemistry” (2013), and “Progress in the Application of Gas Geochemistry to Geothermal, Tectonic and Magmatic Studies” (2017) published as special issues of Chemical Geology and “Gas geochemistry: From conventional to unconventional domains” (2018) published as a special issue of Marine and Petroleum Geology, this volume continues the tradition of publishing papers reflecting the diversity in scope and application of gas geochemistry.
    Description: Published
    Description: 976190
    Description: 6A. Geochimica per l'ambiente e geologia medica
    Description: JCR Journal
    Keywords: geochemistry ; Atmosphere ; 03. Hydrosphere ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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    Temporal changes in seismic wave propagation towards the end of the 2002 Mt Etna eruption (2010)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: Stress can undergo rapid temporal changes in volcanic environments, and this is particularly true during eruptions. We use two independent methods, coda wave interferometry (CWI) and shear wave splitting (SWS) analysis to track stress related wave propagation effects during the waning phase of the 2002 NE fissure eruption at Mt Etna. CWI is used to estimate temporal changes in seismic wave velocity, while SWS is employed to monitor changes in elastic anisotropy. We analyse seismic doublets, detecting temporal changes both in wave velocities and anisotropy, consistent with observed eruptive activity. In particular, syn-eruptive wave propagation changes indicate a depressurization of the system, heralding the termination of the eruption, which occurs three days later.
    Description: Published
    Description: 1779-1788
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Interferometry ; Seismic anisotropy ; Volcano seismology ; Volcano monitoring ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    Time reverse location of seismic long-period events recorded on Mt Etna (2012)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.
    Description: Published
    Description: 452-462
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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