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  • Articles  (41)
  • 04.06. Seismology  (27)
  • 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
  • Campi Flegrei
  • Creep observations and analysis
  • Wave propagation
  • INGV  (27)
  • Wiley  (9)
  • EGU - Copernicus
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Keywords
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  • 1
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    La sismicità storica dell'isola senza terremoti (2020)
    INGV
    Details
    Publication Date: 2020-12-18
    Description: probably confirm this opinion, with qualifica ons. Historical earthquake catalogues, up to CPTI11 [Rovida et al., 2011], report only one Mw 5.1 event on 13 November 1948: it was located in the Sardinian Sea, and had very modest effects on land. In later decades, the seismic networks did record very few earthquakes of moderate energy (Mw 〈5), mostly located off-shore, either south-east of Cagliari or west of Olbia or in the Sea of Sardinia. The most recent ones (occurred in 2000, 2004 and 2006) had very slight effects on the island. Given the low level of instrumental seismicity and the weak macroseismic effects of known historical earthquakes, Sardinia's seismic risk is perceived as very low. The low seismicity of the region certainly has a geological explana on, given that the Corsica-Sardinia block is among the most stable areas of the Mediterranean basin. “Low”, however, does not mean “non- existent”: recent historical research has improved knowledge on the major known historical earthquake of Sardinia (it occurred on June 4, 1616 and was responsible for minor but widespread damage to the system of coastal watchtowers, south-west of Cagliari) and rediscovered several minor earthquakes, part of which were known to the seismological tradi on but had been almost completely forgo en. This paper collects all the documenta on available at present on the seismic history of Sardinia.
    Description: Published
    Description: 1-160
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Sardinia ; Seismicity ; Seismic history ; Historical Earthquakes ; Historical seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 2
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    Statistical moments of power spectrum: a fast tool for the classification of seismic events recorded on volcanoes (2021)
    EGU - Copernicus
    Details
    Publication Date: 2021-01-22
    Description: Spectral analysis has been applied to almost thou-sand seismic events recorded at Vesuvius volcano (Naples,southern Italy) in 2018 with the aim to test a new tool fora fast event classification. We computed two spectral pa-rameters, central frequency and shape factor, from the spec-tral moments of order 0, 1, and 2, for each event at sevenseismic stations taking the mean among the three compo-nents of ground motion. The analyzed events consist ofvolcano-tectonic earthquakes, low frequency events and un-classified events (landslides, rockfall, thunders, quarry blasts,etc.). Most of them are of low magnitude, and/or low maxi-mum signal amplitude, therefore the signal to noise ratio isvery different between the low noise summit stations andthe higher noise stations installed at low elevation aroundthe volcano. The results of our analysis show that volcano-tectonic earthquakes and low frequency events are easily dis-tinguishable through the spectral moments values, particu-larly at seismic stations closer to the epicenter. On the con-trary, unclassified events show the spectral parameters valuesdistributed in a broad range which overlap both the volcano-tectonic earthquakes and the low frequency events. Since thecomputation of spectral parameters is extremely easy and fastfor a detected event, it may become an effective tool for eventclassification in observatory practice.
    Description: Published
    Description: 67–74
    Description: 1SR TERREMOTI - Sorveglianza Sismica e Allerta Tsunami
    Description: N/A or not JCR
    Keywords: Vesuvius ; Spectral Analisys ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    L’eruzione immaginaria. Un’indagine sulla rappresentazione del rischio vulcanico nella fantasia dei bambini (2021)
    INGV
    Details
    Publication Date: 2021-02-01
    Description: All’esperimento “eruzione immaginaria” negli anni scolastici 20172018 e 20182019 hanno contribuito gli Istituti: 2° Circolo Didattico F. Giampaglia di Ercolano; IC 3 De Curtis Ungaretti di Ercolano; IC San Rocco di Marano di Napoli; IC Raffaele Viviani di Napoli; IC 1 Don Bosco Melloni di Portici; IC 3 RodariAnnecchino di Pozzuoli; IC 6 Quasimodo Dicearchia di Pozzuoli; IC 3 CD S. GaetanoGadda di Quarto; DD Scafati 1 di Scafati; ICS De Nicola Sasso di Torre del Greco; IC 5 di Bologna; IC Bonati di Bondeno (FE).
    Description: Da molto tempo il rischio vulcanico è al centro di progetti di divulgazione scientifica, particolarmente in area napoletana, dove l’Osservatorio Vesuviano ha sempre promosso numerose iniziative dedicate all’informazione su pericolosità e rischio vulcanico. In particolare sono state realizzate iniziative formative nelle scuole, sviluppate in collaborazione con il Dipartimento della Protezione Civile, e attività mirate a raggiungere la popolazione più in generale attraverso le visite guidate al Museo della sede storica, oppure con incontri pubblici, mostre, workshops, ecc. organizzati in collaborazione con la Città della Scienza e altri Enti locali. Dal 2005 questa attività formativa si è arricchita attraverso il progetto EDURISK, un’iniziativa più propriamente dedicata all’educazione al rischio sismico e vulcanico nelle scuole, con la realizzazione di corsi di formazione per gli insegnanti. Una delle esperienze più interessanti sviluppate dal progetto EDURISK, è stata la realizzazione nell’anno scolastico 20172018 di un’indagine sull’immaginario di bambini e ragazzi sul rischio vulcanico, con l’obiettivo di individuare, attraverso un’attività creativa l’invenzione di una storia in ambiente vulcanico come percepiscono il contesto vulcanico in cui vivono, come immaginano che possa verificarsi un’eruzione e quale potrebbe essere la loro capacità di risposta. L’indagine è stata realizzata in 23 classi di scuola primaria e secondaria di I grado di Istituti Comprensivi di area vesuviana (Ercolano, Scafati, Torre del Greco) e flegrea (Marano di Napoli, Pozzuoli, Quarto), coinvolgendo complessivamente circa 500 bambini fra gli 8 e i 12 anni. Fra i tanti temi emersi, tre sono fondamentali. In area flegrea la percezione di vivere ‘dentro’ un vulcano è praticamente assente: è pertanto indispensabile attivare percorsi di conoscenza del territorio in cui si vive; per i bambini il passaggio dalla comparsa dei precursori e l’eruzione vera e propria è istantaneo: mancano quindi conoscenze scientifiche specifiche, compresa l’incertezza sulla possibile evoluzione dei fenomeni; infine in caso di eruzione i bambini pensano di doversi salvare da soli: nelle loro storie non esistono istituzioni, un sistema organizzato di protezione civile e di gestione dell’emergenza: è quindi indispensabile e urgente un lavoro educativo sul riconoscimento delle risorse della comunità e di ricostruzione della fiducia fra cittadini e istituzioni.
    Description: Convenzione fra INGV e Dipartimento nazionale della Protezione Civile, Allegato A, tematica “M”
    Description: Published
    Description: 3-42
    Description: 1TM. Formazione
    Description: JCR Journal
    Keywords: Rischio vulcanico ; Edurisk ; Campi Flegrei ; Vesuvio ; scuola ; 05.03. Educational, History of Science, Public Issues ; 05.08. Risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    L'emergenza sismica in Molise (Agosto 2018). Implementazione della rete sismica di emergenza SISMIKO e condivisione dei dati (2020)
    INGV
    Details
    Publication Date: 2021-02-19
    Description: Questo rapporto tecnico descrive le attività svolte da SISMIKO [Moretti et al., 2012; 2016a; 2016b; Pondrelli et al., 2016] in occasione della sequenza sismica che ha interessato l’area in provincia di Campobasso tra i comuni di Montecilfone, Guardialfiera e Larino a partire dal 14 agosto 2018 e che ha visto nel terremoto di magnitudo ML 5.2 (MW 5.1) del 16 agosto 2018 (18:19 UTC), ben risentito in un’ampia area che comprende molte regioni dell’Italia centro meridionale, l’evento più significativo della sequenza. SISMIKO è uno dei gruppi operativi dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV) per la gestione delle emergenze sismiche [Pondrelli et al., 2016], e come per ogni terremoto con magnitudo superiore a 5.0, ovvero alla soglia prevista nella vigente Convenzione tra l’INGV e il Dipartimento della Protezione Civile (DPC), a seguito del terremoto del 16 agosto 2018 (ML 5.2) ha predisposto un intervento volto al miglioramento del monitoraggio sismico dell’area interessata. L’integrazione di stazioni sismiche temporanee nella geometria della Rete Sismica Nazionale (RSN [Michelini et al., 2016; INGV Seismological Data Centre]), consente infatti un miglioramento nella individuazione dei terremoti e un perfezionamento del calcolo dei parametri ipocentrali, soprattutto della profondità che è strettamente connessa alla distanza media tra le stazioni sismiche. L’intervento principale è stato svolto nella giornata del 17 agosto [SISMIKO working group, 2018], ma nelle due settimane successive i siti allestiti sono stati più volte visitati e il giorno 30 si è proceduto con l’integrazione di ulteriori 2 stazioni, portando a 5 i punti di acquisizione della rete temporanea. La rete sismica è stata operativa per circa 2 mesi. I dati sono stati trasmessi in tempo reale al centro di acquisizione dati della rete mobile presso la sede di Roma di SISMIKO e al contempo integrati nel sistema di sorveglianza sismica INGV [Michelini et al., 2016] per essere utilizzati nelle localizzazioni e nei prodotti scientifici forniti in tempo reale. On 16 August 2018 at 18:19:04 UTC an earthquake with magnitude ML 5.2 (MW 5.1) occurred in the Molise region. The earthquake was felt in a large area including many regions of Central and Southern Italy. The seismologists on duty in the 24H seismic monitoring room of the National Institute of Geophysics and Volcanology (INGV) located the event in the province of Campobasso, 4 km south­east of Montecilfone and at a preliminary depth of 9 km. The same area was affected two days before by a MW 4.6 event (August 14 at 23.48 Italian time1). Following the MW 5.1 event and the associated aftershock sequence, the SISMIKO Operational Group was activated [Moretti et al., 2012; 2016a; 2016b; Pondrelli et al., 2016] for the installation of temporary seismic stations to integrate the permanent stations of the National Seismic Network (RSN [Michelini et al., 2016; INGV Seismological Data Centre]) deployed in the region.
    Description: Published
    Description: 1-32
    Description: 2SR TERREMOTI - Gestione delle emergenze sismiche e da maremoto
    Description: N/A or not JCR
    Keywords: SISMIKO ; Seismic networks temporary ; Seismic emergency ; Molise ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 5
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    Repeated absolute gravity measurements on a dense network at Campi Flegrei – a reliable tool for volcano monitoring (2020)
    EGU - Copernicus
    Details
    Publication Date: 2020-11-25
    Description: Since 1981, relative gravity measurements have routinely carried out at the Campi Flegrei caldera, a densely populated area. The gravity network also includes two absolute stations periodically measured with a laboratory absolute gravimeter, which does not permit field measurements. At the end of 2014, the Osservatorio Vesuviano, Section of Napoli of the Istituto Nazionale di Geofisica e Vulcanologia (INGV-OV), acquired a portable absolute gravimeter that allows field operations on outdoor sites. Therefore, in 2015 a dense absolute gravity network was established in Campi Flegrei. This will permit an advanced approach for volcano monitoring. The net consists of 36 stations, 34 of which located inside the caldera and placed upon or very close to gravity stations belonging to the relative network. Five surveys were carried out on June 2015, on February and November 2017, on October 2018 and on October 2019. The comparison with height changes suggests that significant Δg are partly due to the uplift occurred over the same time intervals and mostly to shallow processes associated to the dynamic of the local hydrothermal system. The comparison with the gradients observed during the last large uplift (1982-1984) and the following subsidence (1985-2003) confirms this observation. These results suggest that the present activity may be due to a transient or pulsating phenomenon as the alternating recharge/discharge of fluids in the surface hydrothermal system. Gravity changes detected by absolute measurements are in good agreement with those obtained by relative ones, and confirms the feasibility of this methodology for volcano monitoring. Finally, they also encourage replacing the relative networks with absolute ones, with all the consequent advantages.
    Description: Published
    Description: 41-54
    Description: 4V. Processi pre-eruttivi
    Description: JCR Journal
    Keywords: Gravimetria assoluta ; Campi Flegrei
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
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    Terremoti in relazione a fenomeni elettrici e magnetici (Milne, 1890). Traduzione commentata. (2021)
    INGV
    Details
    Publication Date: 2021-06-18
    Description: Questa è una traduzione commentata del raro documento citato da oltre un secolo di bibliografia come “Milne, 1890”. Si è studiato il testo per verificare la realisticità di alcune recenti affermazioni sul fatto che questo rapporto (oggi difficilmente reperibile) avesse trattato per la prima volta di precursori elettromagnetici. Si è cercato di indagare su ogni episodio e personaggio, identificando i criptici (e a volte inesistenti) riferimenti bibliografici, rintracciando quasi tutti i testi, ampliando e commentando spesso le relative citazioni. La mia opinione è che nessuno all’epoca di Milne avesse consapevolmente, ma forse nemmeno accidentalmente, osservato un precursore di origine elettromagnetica. I fenomeni descritti sono studiati da un punto di vista puramente elettrico o magnetico. I segnali elettrici riguardano tensioni e correnti troppo alte. I fenomeni magnetici già all’epoca furono contestati come prodotti di effetti inerziali ma comunque è difficile pensare che la componente campo magnetico di un segnale EM possa deviare stabilmente l’ago di una bussola. Questa stessa ricerca ha tuttavia portato alla luce qualche altro caso sospetto che sarebbe opportuno indagare in modo più approfondito, in quanto potrebbe risultare realmente il primo caso documentabile dell’osservazione di un precursore elettromagnetico del terremoto.
    Description: This is a commented translation of the rare document cited by more than a century of bibliography as "Milne, 1890". The text was studied to verify the veracity of some recent claims that this report (presently difficult to find) had dealt with electromagnetic precursors for the first time. An attempt was made to investigate each episode and character, identifying the cryptic (and sometimes non-existent) bibliographic references, tracing almost all the texts, often expanding and commenting on the relative citations. My opinion is that no one, at the time of Milne, had consciously, but maybe not even accidentally, observed a precursor of electromagnetic origin. The phenomena described are studied from either a purely electrical or magnetic point of view. Electrical signals concern too high voltages and currents. Magnetic phenomena, already at the time, were contested as products of inertial effects, but in any case it is difficult to think that the magnetic field component of an EM signal can permanently deflect the needle of a compass. However this same research has brought to light some other potentially interesting cases that should be investigated further. One of them, could actually be the first documentable case of the observation of an electromagnetic seismic precursor.
    Description: Progetto INGV “Pianeta Dinamico” (codice progetto INGV 1020.010) finanziato dal MIUR ("Fondo finalizzato al rilancio degli investimenti delle amministrazioni centrali dello Stato e allo sviluppo del Paese", legge 145/2018).
    Description: Published
    Description: 1-48
    Description: 2TM. Divulgazione Scientifica
    Description: JCR Journal
    Keywords: Earthquake ; electric precursors ; magnetic precursors ; precursorori ; terremoto ; electromagnetic precursors ; precursori elettromagnetici ; John Milne ; 04.06. Seismology ; 05.03. Educational, History of Science, Public Issues
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    Style of faulting of expected earthquakes in Italy as an input for seismic hazard modeling (2020)
    EGU - Copernicus
    Details
    Publication Date: 2020-12-18
    Description: Tectonic styles and distributions of nodal planes are an essential input for probabilistic seismic hazard assessment. As a part of a recent elaboration of a new seismic hazard model for Italy, we adopted a cascade criteria approach to parametrize the tectonic style of expected earthquake ruptures and their uncertainty in an area-based seismicity model. Using available or recomputed seismic moment tensors for relevant seismic events (Mw starting from 4.5), first arrival focal mechanisms for less recent earthquakes, and also geological data on past activated faults, we collected a database for the last ~ 100 yrs gathering a thousand of data all over the Italian peninsula and regions around it. The adopted procedure consists, in each seismic zone, of separating the available seismic moment tensors in the three main tectonic styles, making summation within each group, identifying possible nodal plane(s) taking into account the different percentages of tectonic styles and including, where necessary, total or partial random source contributions. Referring to the used area source model, for several seismic zones we obtained robust results, e.g. along the southern Apennines we expect future earthquakes to be mostly extensional, although in the outer part of the chain strike-slip events are possible. In the Northern part of the Apennines we also expect different tectonic styles for different hypocentral depths. In zones characterized by a low seismic moment release, the possible tectonic style of future earthquakes is less clear and it has been represented using different combination (total or partial) of random sources.
    Description: Published
    Description: 3577–3592
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Testing and optimization of the seismic networks of Campi Flegrei (Southern Italy) (2021)
    EGU - Copernicus
    Details
    Publication Date: 2021-01-26
    Description: . The definition of the network resolution power is an important parameter to be considered when evaluating most of the seismic analysis, being connected to the location quality and earthquakes detectability. We estimated the resolving power of the seismic network of Campi Flegrei. The results show that the actual moment magnitude threshold is 0.5 in the Solfatara area, center of the caldera, but increases sharply going away from the center. We also estimated the theoretical resolution power of the actual seismic network of Campi Flegrei plus 5 hypothetical borehole stations, moving the borehole stations into 3 different wells. As expected, big improvements in the location parameters come from the use of borehole stations. The results show that a 3000 m deep borehole located close to the actual hypocentral area would allow to detect and locate the very low magnitude earthquakes, probably connected to the hydrothermal system characterizing the Campi Flegrei caldera. Finally, we performed an optimization analysis of the permanent seismic network of Campi Flegrei finding the best 3 station positions that would increase the resolution power of the network to locate earthquakes in the South and offshore part of the caldera. We evidenced that the actual network has an improvable resolution in the South and West part of the caldera
    Description: Published
    Description: 49-55
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: JCR Journal
    Keywords: Campi Flegrei
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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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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  • 10
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    Gravity changes due to overpressure sources in 3D heterogeneous media: application to Campi Flegrei caldera, Italy (2009)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: Employing a 3D finite element method, we develop an algorithm to calculate gravity changes due to pressurized sources of any shape in elastic and inelastic heterogeneous media. We consider different source models, such as sphere, spheroid and sill, dilating in elastic media (homogeneous and heterogeneous) and in elasto-plastic media. The models are oriented to reproduce the gravity changes and the surface deformation observed at Campi Flegrei caldera (Italy), during the 1982-1984 unrest episode. The source shape and the characteristics of the medium have great influence on the calculated gravity changes, leading to very different values for the source densities. Indeed, the gravity residual strongly depends upon the shape of the source. Non negligible contributions also come from density and rigidity heterogeneities within the medium. Furthermore, if the caldera is elasto- plastic, the resulting gravity changes exhibit a pattern similar to that provided by a low effective rigidity. Even if the variation of the source volumes is quite similar for most of the models considered, the density inferred for the source ranges from ∼400 kg/m3 (super critical water) to ∼3300 kg/m3 (higher than trachytic basalts), with drastically different implications for risk assessment.
    Description: Published
    Description: 119-133
    Description: 3.6. Fisica del vulcanismo
    Description: JCR Journal
    Description: open
    Keywords: Campi Flegrei ; deformation ; gravity ; finite element method ; heterogeneous medium ; 04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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