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  • 1
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    The marine activities performed within the TOMO-ETNA experiment (2017)
    Details
    Publication Date: 2021-04-07
    Description: The TOMO-ETNA experiment was planned in order to obtain a detailed geological and structural model of the continental and oceanic crust beneath Mt. Etna volcano and northeastern Sicily up to the Aeolian Islands (southern Italy), by integrating data from active and passive refraction and reflection seismic methodologies, magnetic and gravity surveys. This paper focuses on the marine activities performed within the experiment, which have been carried out in the Ionian and Tyrrhenian Seas, during three multidisciplinary oceanographic cruises, involving three research vessels (“Sarmiento de Gamboa”, “Galatea” and “Aegaeo”) belonging to different countries and institutions. During the offshore surveys about 9700 air-gun shots were produced to achieve a high-resolution seismic tomography through the wide-angle seismic refraction method, covering a total of nearly 2650 km of shooting tracks. To register ground motion, 27 ocean bottom seismometers were deployed, extending the inland seismic permanent network of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) and a temporary network installed for the experiment. A total of 1410 km of multi-channel seismic reflection profiles were acquired to image the subsurface of the area and to achieve a 2D velocity model for each profile. Multibeam sonar and sub bottom profiler data were also collected. Moreover, a total of 2020 km of magnetic and 680 km of gravity track lines were acquired to compile magnetic and gravity anomaly maps offshore Mt. Etna volcano. Here, high-resolution images of the seafloor, as well as sediment and rock samples, were also collected using a remotely operated vehicle.
    Description: Published
    Description: S0428
    Description: 3A. Ambiente Marino
    Description: JCR Journal
    Description: open
    Keywords: Scientific cruise report ; Marine geophysical data acquisition ; Etna offshore ; Ionian and Tyrrhenian Seas ; 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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  • 2
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    Near-Bottom Magnetic Signatures of Submarine Hydrothermal Systems at Marsili and Palinuro Volcanoes, Southern Tyrrhenian Sea, Italy (2015)
    Society of Economic Geologists
    Details
    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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  • 3
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    Mapping of seafloor hydrothermally altered rocks using geophysical methods: Marsili and Palinuro seamounts, Southern Tyrrhenian Sea (2015)
    Society of Economic Geologists
    Details
    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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  • 4
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    Geomagnetic anomaly in opening basin structures: the Tyrrhenian Sea example (2015)
    Details
    Publication Date: 2017-04-04
    Description: The aim of this work is to improve the informative content of regional survey aeromagnetic data to allow high frequency anomaly studies in regional analysis too. The analysis has been applied to study Tyrrhenian seamounts and to link them in structural configuration and age. To cancel spectral difference due to distance and position of magmatic sources (seamounts and volcanic islands) with respect to altitude survey, the South Tyrrhenian geomagnetic anomaly field has been reduced to bottom topographic surface by the metrologic technique BTM (Bottom Reduction Method, Faggioni et al., 2001). The data set comes from the aeromagnetic surveys performed by AGIP over the South Tyrrhenian Sea in 1977. The flight pattern covers a surface of 69173 Km² and is made up of 230850 measurements; its location is approximately between 38° and 41°N longitude and 10° and 15°E latitude. Data have been organized in a grid with latitude and longitude as channels, over which the matrix computation of maps are built. The anomaly map is the result of subtracting the IGRF (International Geomagnetic Reference Field) model from the total anomaly field map. Anomaly signal, as residual of IGRF procedure, is produced by more superficial sources (i.e. seamounts), therefore it is directly informative about their physical characteristics. It shows values of little coherence, because the reduction of the reference field was derived from a subjective surface composed by the envelope of local planes at the time of the survey. This distortion has been removed resorting to DSP (Digital Signal Processing). After obtaining the “cleaned” magnetic anomaly map, the following step was the matrix transport in frequency to carry out the spectral analysis of data and to identify the cut-frequency to separate low (L) and high (H) frequency components. From the first, the S.R.F. (Spectral Reference Field) is obtained i.e. the cotransformation of low frequency and gives information about deep magnetic structures. The high frequency component, computed as direct reduction (difference between correct magnetic anomaly field and low frequency one), is the S.A.F. (Spectral Anomaly Field). The bottom reduced magnetic anomaly field comes from merging the frequency bands (H e L) after projection of vertical gradient through increasing parameters of geomagnetic field and the depth of all grid points. The modelling of BTM field in some interesting areas is shown.
    Description: Published
    Description: Fortezza da Basso, Firenze
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: restricted
    Keywords: Magnetic anomaly, Tyrrhenian Sea, aeromagnetic survey ; 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 5
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    CLEAN SEA project: the test in Lake Vättern (Sweden) (2016)
    Details
    Publication Date: 2017-04-04
    Description: The CLEAN SEA (Continuous Long-term Environmental and Asset iNtegrity monitoring at SEA) project has been realized by eni e&p and its subsidiary Eni Norge in cooperation with Tecnomare in 2012. The aim of the project is to use a commercially available AUV properly upgraded, installed and operated by SAAB AUV, for the execu- tion of environmental monitoring in offshore zone. We participated to the project performing the environmental characterization of site (Lake Vättern, Sweden) selected for the field test of Clean Sea project, and to providing support to processing the collected data by the payload installed. In detail, in the first phase of the project, we char- acterized the site of interest analyzing the clime, the morphology, and the principal chemical and physical water and environmental parameters on the basis of historical data (meteorology, hydrology, hydrodynamic, wind, ice cover and natural resources of the lake). In the second phase of the project, we processed the oceanographic and environmental data acquired in Lake Vättern during the AUV tests. The tests have been performed in two different areas in the East and West side of the lake. In detail Temperature, Salinity, Methane, Turbidity, Chlorophyll, Col- ored Dissolved Organic Matter, Polycyclic Aromatic Hydrocarbons, Oxygen, pH, Oxidation Reduction Potential, Refined Oil and Crude Oil have been acquired in 21 different tests with 4 different mission types, and successively processed and evaluated. The analysis highlights the spatial and temporal variability for each parameter, and allows the comparison with the available historical data.
    Description: Published
    Description: Vienna
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: open
    Keywords: AUV ; Vättern ; environmental monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 6
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    Sea-surface and deep-magnetic data at Vavilov Seamount, Tyrrhenian Sea (2016)
    Details
    Publication Date: 2017-04-04
    Description: Sea surface and deep magnetic data were acquired at Vavilov seamount, in the Tyrrhenian sea. Vavilov seamount is located in the central portion of the homonymous Vavilov basin. The seamount stands about 2800 meters above the seafloor at 3600 meters depth, with the top at about 800 meters below the sea level. Oceanization of the basin occurred during the Late Miocene-Early Pliocene. The magnetic data were collected in 2011 on board the Nave Ammiraglio Magnaghi by using a Marine Magnetics Seaspy magnetometer. The sea surface magnetic survey was realized with two different grids: the first regional one, with 13 parallel lines about 43 Km long, 3 Km spaced (104° N oriented) and 6 tie control lines about 40 Km long, 5 Km spaced (014° N oriented). The second one was realized to better define the volcanic structure of the seamount, and was achieved by acquiring 12 magnetic parallel lines (104° N), 18 Km long and 1 Km spaced. The deep magnetic data were collected by towing a magnetic sensor coupled with a L3 sidescan sonar Klein 3000. A set of 5 parallel lines were acquired in correspondence of the bathymetric top of the seamount with the sensor flying at about constant depth of 700 meters. These data represents the first near-bottom magnetic data collected for Vavilov seamount and it allows comparison between sea-surface and deep magnetic data.
    Description: Published
    Description: Vienna, Austria
    Description: 3A. Ambiente Marino
    Description: restricted
    Keywords: Tyrrhenian sea ; Vavilov Seamount ; 04. Solid Earth::04.04. Geology::04.04.04. Marine geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 7
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    Acquisition procedures, processing methodologies and preliminary results of magnetic and ROV data collected during the TOMO-ETNA experiment (2017)
    Details
    Publication Date: 2017-04-04
    Description: The TOMO-ETNA experiment was devised for the investigation of the continental and oceanic crust beneath Mt. Etna volcano and northeastern Sicily up to the Aeolian Islands, through an active source study. In this experiment, a large amount of geophysical data was collected both inland and in the Ionian and Tyrrhenian Seas for identifying the major geological and structural features offshore Mt. Etna and NE Sicily. One of the oceanographic cruises organized within the TOMO-ETNA experiment was carried out on the hydrographic vessel “Galatea” by Italian Navy. During the cruise a detailed magnetic survey and a set of ROV (remotely operated vehicle) dives were performed offshore Mt. Etna. The magnetic survey allowed the compilation of a preliminary magnetic map revealing a clear direct relationship between volcanic structures and high frequency magnetic anomalies. Significant positive magnetic anomalies were identified offshore the Timpa area and along the easternmost portion of the Riposto Ridge and correlated to a primitive volcanic edifice and to shallow volcanic bodies, respectively. On the whole, the magnetic anomaly map highlights a clear SW-NE decreasing trend, where high amplitude positive magnetic anomaly pattern of the SW sector passes, northeastwardly, to a main negative one. ROV dives permitted to directly explore the shallowest sectors of the Riposto Ridge and to collect several videos and seafloor samples, allowing us to identify some locally developed volcanic manifestations.
    Description: Published
    Description: S0431
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: open
    Keywords: Magnetic survey ; ROV dives ; Mt. Etna offshore ; TOMO-ETNA experiment ; 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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  • 8
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    OS-IS® Sistema sismico per il monitoraggio e la previsione del moto ondoso (2015)
    Associazioni Scientifiche per le Informazioni Territoriali e Ambientali (ASITA)
    Details
    Publication Date: 2021-09-08
    Description: The European project “Wind, Ports, and Sea”, funded by the European Cross-border Programme “Italy–France Maritime 2007-2013”, aims to improve the safety conditions and to reduce the hazards by monitoring and forecasting the sea-state outside the main ports of the Northern Tyrrhenian and Ligurian Seas. The sea state forecast is done by using a numeric model specifically developed, while the used data are obtained by means of a monitoring system of stations installed in the coast of La Spezia harbor so to perform an inland remote monitoring. This remote monitoring system of the sea, called OSIS ® (Ocean Seismic - Integrated Solution), is a pilot project and will be presented in its main features. The main advantage of the OS-IS® is that it is installed inland and there are no parts in the sea. The key elements of the system are a high sensitivity accelerometers and apposite algorithms for the evaluation of the sea state using the micro-seismic signals on the basis of the mathematical models and the appropriate calibration factors. Actually, since the beginning of the 1900, is well known that the sea waves are sources of a microseismic noise and this phenomenon has been described with more and more precise models since the 1950 by Longuet-Higgins. The OS-IS® system used for "Wind, Ports and Sea" project is made of three micro-seismic stations installed near the La Spezia gulf: each accelerometric station is equipped with a weather station and a data logger that automatically transfers the data to a central server which runs the algorithm of the OS-IS®. In the following will be shortly described the installed systems focusing on its reliability and in the comparison with the traditional monitoring system using buoy. Finally the first measurements will be shown in comparison with those of the conventional method based on the buoys.
    Description: Autorità Portuale della Spezia, Programma di cooperazione transfrontaliera Italia-Francia “Marittimo” 2007-2013
    Description: Published
    Description: 691-698
    Description: 3A. Ambiente Marino
    Description: N/A or not JCR
    Description: restricted
    Keywords: OS-IS®, moto ondoso, Vento, Porti e Mare, ; 03. Hydrosphere::03.02. Hydrology::03.02.05. Models and Forecasts
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    The first ultra-high resolution Digital Terrain Model of the shallow-water sector around Lipari Island (Aeolian Islands, Italy) (2015)
    Details
    Publication Date: 2024-05-09
    Description: Very high resolution bathymetric map obtained through multibeam echo-sounders data are crucial to generate accurate Digital Elevation Terrain Models from which the morphological setting of active volcanic areas can be analyzed in detail. Here we show and discuss the main results from the first multibeam bathymetric survey performed in shallow-waters around the Island of Lipari, the largest and the most densely populated of the Aeolian islands (Southern Italy). Data have been collected in the depth range of 0.1-150 m and complete the already existent high-resolution multibeam bathymetry realized between 100 and 1300 m water depth. The new ultra-high resolution bathymetric maps at 0.1-0.5 m provide new insights on the shallow seafloor of Lipari, allowing to detail a large spectrum of volcanic, erosive-depositional and anthropic features. Moreover, the presented data allow outlining the recent morphological evolution of the shallow coastal sector of this active volcanic island, indicating the presence of potential geo-hazard factors in shallow waters.
    Description: Published
    Description: S0218
    Description: 1V. Storia e struttura dei sistemi vulcanici
    Description: JCR Journal
    Description: open
    Keywords: Lipari ; multibeam bathymetry ; seafloor geomorphology ; Aeolian islands ; geohazard ; 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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