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  • INGV  (5)
  • Society of Economic Geologists  (4)
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  • 1
  • 2
  • 3
    Publication Date: 2021-07-14
    Description: Near-bottom magnetic field data were collected using a towed magnetometer over selected parts of Palinuro and Marsili submarine volcanoes in the southern Tyrrhenian Sea, Italy. We obtained equivalent magnetizations maps at these sites by inverting the corresponding magnetic anomalies, highlighting the seafloor expression of hydrothermal alteration. Zones of reduced magnetization are interpreted as evidence for alteration related to hydrothermal processes; they are associated with water-column and seafloor observations of hydrothermal activity and altered host rocks. At Marsili volcano, a large elliptical area of reduced magnetization is located south of the summit cone and perpendicular to the trend of Marsili volcano itself. This confirms the presence of a large hydrothermal system centered over the more recent eastern volcanic ridge and its associated magma chamber. Similarly, areas of reduced magnetization over Palinuro caldera are consistent with hydrothermal venting occurring along the caldera walls, consistent with permeability structures related to caldera ring faults providing preferred pathways for the upflow of hydrothermal fluids.
    Description: Published
    Description: 2119-2128
    Description: 3A. Ambiente Marino
    Description: JCR Journal
    Description: restricted
    Keywords: magnetic anomaly ; hydrothermal system ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2021-07-14
    Description: Hydrothermal alteration processes involve mineralogical, chemical, and textural changes as a result of hot aqueous #uid-rock interaction under evolving boundary conditions. These changes affect the physico-chemical properties of the rocks, enabling high-resolution geophysical prospecting to be an important tool in the detection of sea#oor hydrothermal alteration. Here we present the results of recent geophysical investigations of the Marsili and Palinuro volcanic complexes, southern Tyrrhenian Sea, during the 2010 TIR10 and 2011 MAVA2011 cruises by the R/V Urania. The new dataset includes a dense grid of multibeam bathymetry; sea#oor re#ectivity, magnetic and gravity lines; and high-resolution single (CHIRP) and multichannel seismic proYles. The surveys were focused on areas known to host intense hydrothermal alteration in order to provide a more detailed description of the Marsili and Palinuro hydrothermal systems. Ground-truthing was based on earlier discoveries of hydrothermal vents and their associated deposits, and on direct observations made by ROV dives. High-resolution morpho-bathymetry, sonar re#ectivity, rock magnetization, and density distribution together enabled us to assess the extent of sea#oor hydrothermal alteration and its relationship to local volcanic and tectonic structures. Hydrothermal alteration associated with the Marsili seamount is largely distributed along primary volcano-tectonic structures at the ridge crest. By contrast, at Palinuro hydrothermal alteration is mostly associated with secondary volcanic structures such as collapsed calderas and volcanism reactivation along ring faults. In particular, evidence for intense hydrothermal activity occurs at Palinuro where volcanotectonic features interact with regional tectonic structures.
    Description: Published
    Description: 2103-2117
    Description: 3A. Ambiente Marino
    Description: JCR Journal
    Description: restricted
    Keywords: magnetic anomaly ; gravity anomaly ; backscattering ; hydrothermal process ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2017-04-04
    Description: We describe a magneto-gradiometric survey performed in the «Mar Piccolo» of Taranto, Italy in May 2005 for environmental purposes. This region, which is a noisy harbour environment, provides a challenging test for magnetic methods. To reduce spurious noise signals, with both temporal and spatial origins, we used two Geometrics G880 model caesium magnetometers towed in a transverse gradient configuration. We show how, in shallow waters, this gradiometric configuration allows us to distinguish anomalies due to small metallic bodies near the seabed from the induced noise due to the anthropic contribution and geomagnetic field variations. A direct visual inspection confirmed that the peculiarities highlighted in the gradient anomaly map were due to abandoned metallic objects found on the seabed.
    Description: Published
    Description: 459-467
    Description: 1.8. Osservazioni di geofisica ambientale
    Description: JCR Journal
    Description: open
    Keywords: environmental reclamation ; anthropic noise ; magneto-gradiometric survey ; 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous ; 04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous ; 04. Solid Earth::04.05. Geomagnetism::04.05.09. Environmental magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
    Publication Date: 2019-11-04
    Description: The aim of this work is the formulation of a 3D model of the Mt. Amiata volcanic complex (Southern Tuscany) by means of geomagnetic data. This work is shown not only as a real test to check the validity of the inversion algorithm, but also to add information about the structure of the volcanic complex. First, we outline briefly the theory of geomagnetic data inversion and we introduce the approach adopted. Then we show the 3D model of the Amiata volcano built from the inversion, and we compare it with the available geological information. The most important consideration regards the surface distribution of the magnetization that is in good agreement with rock samples from this area. Moreover, the recovered model orientation recall the extension of the lava flows, and as a last proof of validity, the source appears to be contained inside of the topographic contour level. The credibility of the inversion procedure drives the interpretation even for the deepest part of the volcano. The geomagnetic signal appears suppressed at a depth of about 2 km, but the most striking consequence is that sub-vertical structures are found even in different positions from the conduits shown in the geologic sections. The results are thus in good agreement with the information obtained from other data, but showing features that had not been identified, stressing the informative power of the geomagnetic signal when a meaningful inversion algorithm is used.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: magnetic method ; Mt. Amiata volcano ; potential field inversion ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 916647 bytes
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  • 7
    Publication Date: 2019-11-04
    Description: We analyse a microgravity data set acquired from two spring LaCoste & Romberg gravity meters operated in parallel at the same site on Etna volcano (Italy) for about two months (August – September 2005). The high sampling rate acquisition (2Hz) allowed the correlation of short-lasting gravity fluctuations with seismic events. After characterizing the oscillation behavior of the meters, through the study of spectral content and the background noise level of both sequences, we recognized fluctuations in the gravity data, spanning a range of periods from 1 second to about 30 seconds dominated by components with a period of about 15 ÷ 25 seconds, during time intervals encompassing both local seismic events and large worldwide earthquakes. The data analyses demonstrate that observed earthquake-induced gravity fluctuations have some differences due to diverse spectral content of the earthquakes. When local seismic events which present high frequency content excite the meters, the correlation between the two gravity signals is poor (factor 〈 0.3). Vice versa, when large worldwide earthquakes occur and low frequency seismic waves dominate the ensuing seismic wavefield, the resonance frequencies of the meters are excited and they react according to more common features. In the latter case, the signals from the two instruments are strongly correlated to each other (up to 0.9). In this paper the behaviors of spring gravimeters in the frequency range of the disturbances produced by local and large worldwide earthquakes are presented and discussed.
    Description: Published
    Description: 87-103
    Description: 2.6. TTC - Laboratorio di gravimetria, magnetismo ed elettromagnetismo in aree attive
    Description: JCR Journal
    Description: open
    Keywords: gravimeters ; earthquakes ; seismic-induced effects ; gravity fluctuations ; resonance ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
    Publication Date: 2019-11-04
    Description: This paper presents the revised aeromagnetic anomaly map of Italy and its surrounding seas, projected at reference altitude of 2500 m and geomagnetic epoch 1979.0. The magnetic data set used for the map compilation is composed of the total intensity field data acquired partly during the aeromagnetic surveys performed by the Italian National Oil Company (Agip - Direzione Esplorazione Idrocarburi) between 1971 and 1980, and during the new surveys committed by the Geophysical Corporate Services of Eni Spa - Exploration & Production Division in the years 2001-2002. In both campaigns the recorded data were very dense and uniformly distributed over the examined area. A detailed re-processing of this data set and a re-organization into a new digital database were carried out. The re-processing was done using modern adequate techniques, obtaining a remarkable exploitation of the data information content. The result is a colour shaded relief map that shows on a large scale many of the structural lineaments of the Italian area. The inclusion of a larger number of data and the subtraction of an appropriate magnetic reference field are the main reasons of an enhancement in the anomaly definition. This new map replaces the previous Agip version, and aims to become the reference aeromagnetic cartography of the Italian area. We think this work will be useful both for researchers interested in large scale tectonic studies, and for anyone interested in the investigation of smaller scale structures, such as volcanic complexes or infra-sedimentary magnetic bodies, as well as for mining research.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: geomagnetism ; aeromagnetic anomaly ; magnetic methods ; aeromagnetic cartography ; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 2261765 bytes
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  • 9
    Publication Date: 2022-05-04
    Description: “Il dovere degli scienziati non è quello di educare il pubblico, ma piuttosto di interagire con esso. Il pubblico è la vera forza trainante dietro decisioni con conseguenze sociali, e deve essere coinvolto su base paritaria nei dibattiti inerenti queste decisioni” . La comunicazione scientifica e tecnologica fra scienza e società, da anni, non è più un mero scambio di informazioni e risultati (spesso fra determinate élite), ma è diventata il veicolo privilegiato per insegnare, formare ed ispirare un pubblico sempre più ampio. Ma non si parla solo di trasmissione uni-direzionale: il dibattito fra scienza, tecnologia e società (amministratori locali, politici, imprenditori, giornalisti, studenti e semplici cittadini) sta guadagnando una partecipazione di interlocutori sempre più numerosi e preparati su temi dalle complesse caratteristiche ed implicazioni (etiche, sociali, economiche, politiche). Questo è in parte dovuto ai cambiamenti avvenuti negli ultimi anni nella scienza (e all’impatto che essa sta avendo in molti ambiti della vita sociale. Tali cambiamenti stanno determinando nuove forme di comunicazione scientifica e cooperazione con la società e l’aumento, nell’ultimo decennio, di iniziative e percorsi di formazione, spesso organizzati dalle stesse istituzioni scientifiche. Uno dei risultati più tangibili della cambiata interazione fra scienza e società è la nuova generazione di ricercatori-comunicatori, dotati di una maggiore abilità nel comunicare la scienza in modo efficace e ad un pubblico più ampio e diversificato. In questo contesto diventa importante capire l’efficacia di ogni azione di comunicazione scientifica, impostando uno studio che analizzi, volta per volta, i punti di successo e le criticità emerse nei due comparti causa-effetto. Causa – gli elementi di base della comunicazione scientifica e tecnologica: i valori sociali e culturali di riferimento (ad es. protezione ambientale, sicurezza, salute); -i contenuti (formato di presentazione, tematiche scelte); -i canali usati (web, social networks, stampa cartacea etc.); -i modelli di relazione con il pubblico (scienza vs pubblico, peer education). Effetto - la risposta della società: diretta (affluenza; questionari di gradimento) indiretta (visualizzazioni web; like se tweet dei social network). Questo lavoro presenta una relazione illustrativa (per la prima volta sul territorio della Spezia) dell’efficacia di un evento specifico inserito all’interno di una manifestazione di portata locale, la “Festa della Marineria 2013 ”, destinato al grande pubblico e caratterizzato da diverse attività (tra le quali quelle di tipo ludico-educativo) concepite con l’obiettivo di puntare l’attenzione sui ‘tesori’ scientifici e culturali di una ‘Città di Mare’qual'è La Spezia .
    Description: Distretto Ligure delle Tecnologie Marine, Città della Spezia, Ente fieristico La Spezia
    Description: Published
    Description: 1-21
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: N/A or not JCR
    Description: open
    Keywords: Eventi, divulgazione scientifica, Festa della Marineria ; 05. General::05.03. Educational, History of Science, Public Issues::05.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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