Options
Cocchi, Luca
Loading...
Preferred name
Cocchi, Luca
Email
luca.cocchi@ingv.it
Staff
staff
ORCID
75 results
Now showing 1 - 10 of 75
- PublicationOpen AccessLarge silicic magma chambers at the Moho depth characterize the multi-level plumbing system of back-arc spreading ridges(2023-11)
; ; ; ; ;; ; The plumbing system of volcanoes in crustal convergent settings consists of vertically superimposed, sill-like reservoirs. The shallower reservoirs are generally filled by less dense and SiO2-richer magmas. The plumbing systems of spreading ridges are supposed to be simpler and characterized by prevailing sub-parallel vertical dykes. Here, we present the results of thermo-barometric determinations from minerals and modelling of potential field data at the Marsili spreading ridge in the Southern Tyrrhenian Sea back-arc oceanic basin. The Marsili plumbing system consists of sill-like, large SiO2-rich magma reservoirs located at the Moho depth and sub-vertical basaltic dykes crossing the whole oceanic crust. The formation of deep-seated silicic reservoirs is associated with a decrease in the back-arc spreading rate. The geometry of the plumbing system of spreading ridges may be not dissimilar from that of volcanoes at convergent margins.79 22 - PublicationOpen AccessThe tsunamigenic potential of landslide-generated tsunamis on the Vavilov seamount(2023)
; ; ; ; ; ; ; ; ; ; ; ;; ; ;; ; ; ;The investigation of submarine volcanoes and the tsunamigenic potential of possible movements on their flanks is arduous. In most cases, the lack of specific information about the eruptions' history and their consequences does not allow a comprehensive analysis in terms of hazard. Nevertheless, useful clues on the possible occurrence of mass movements on seamounts can be obtained from a series of research fields. These account for morphological studies, observations of hydrothermal activity, collection of geophysical data (for example, detailed DEM, seismic profiles, magnetic data), etc. In this context, this study presents new bathymetric data of the Vavilov submarine volcano (Tyrrhenian Sea, Italy) and a detailed morphological analysis of the structure. The latter allows the identification of zones potentially prone to mass movements and the development of numerical scenarios to investigate the tsunami potential associated to these movements on the Vavilov flanks. Results prove that the waves generated by the mass displacements in the proposed scenarios (involving sliding volumes between 0.32 km3 and 1.7 km3) reach maximum values in the order of centimetres, not considering dispersive effects. Eventually, a scenario involving the partial collapse of the west flank of the Vavilov Seamount is simulated, although the occurrence of such an event in the past is still debated due to the uncertainties related to the origin and development of the volcano dome. In this scenario, water elevation as high as 10 m are found in large portions of the Tyrrhenian coasts: waves are large enough to emplace sizeable tsunami deposits onshore, that could have been preserved until today in some specific stretches of the coast and could be detected by a finalised geological search. This study belongs to a series of works devoted to the submarine structures of the Tyrrhenian Sea aiming to disclose the tsunamigenic potential of submarine mass movements on their flanks.121 19 - PublicationOpen AccessEvidenze di lineamenti strutturali da dati aeromagnetici mediante tecniche di filtraggio direzionale(2004-12-14)
; ; ; ; ; ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Giori, I.; Eni SpA ;Stefanelli, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ;; ; In questo lavoro vengono presentati i risultati derivanti da analisi dei dati della nuova Carta Aeromagnetica d’Italia (Eni Exploration & Production division e Cunispe, 2002) relativi all’area del Tirreno centrale mediante le tecniche di filtraggio direzionale. L’area in analisi comprende la regione del Tirreno centrale in particolare la fascia geografica del 41° parallelo. Lungo questo parallelo sono allineate diverse strutture geologiche come, seamount, faglie profonde e le strutture vulcaniche dell’area campana.......146 92 - PublicationOpen AccessThe Marine Technology Liguria District, an opportunity for Collaboration and Training(2008)
; ; ; ; ; ; ; ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tivegna, P; SPEDIA SpA ;Sgherri, R. G.; OTOMELARA SpA ;Gambetta, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Stefanelli, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ;; This work focus on the newly born DLTM, namely the Distretto Ligure delle Tecnologie Marine, based in La Spezia, Liguria Region (IT). The main involved partners are: Ministries, Regione Liguria Council, Spedia SpA Company, Industries, SMEs (SMBs), Universities and National Research Institutes. The DLTM has been created as an answer to the local versus global needs of marine products innovation, technology and science. In order to provide, both the local and international community, effective solutions the DLTM aims to: - promote Innovation and pre-competitiveness of activities related to industrial research; - enhance the value and visibility of excellence areas existing in the Ligurian region (in the big enterprises as well as in SMEs) concerning marine technology; - enhance the value of academic activities focusing their R&D on industrial products/processes, assuring, evaluating and preventing environmental sustainability also in case of extreme events; - harmonize/make sustainable the economy and the society promoting scientific innovation and technological development, by means of Universities, Public and Private Research Institutes (at regional, national and EU level); - help the exchange of ideas and realization of projects aimed at developing the District objectives; - increase the dissemination and valorisation of District results and achievements, build capacity in the sectors of interest to the District. The DLTM is characterized by two main macro-themes ......181 226 - PublicationOpen AccessDetph-to-the-bottom Optimization for Potential-field Data Inversion(2007-05-22)
; ; ; ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;; We show an algorithm for the linear inversion of 2D surface magnetic data to obtain 3D models of the susceptibility of the source. After showing a novel characterization of the ambiguity domain in the Fourier space, which has a simple geometrical interpretation, we will demonstrate that a depth-weighting function is useful to significantly reduce the ambiguity domain in order to characterize the main source properties. The forward model is discretized by a mesh of prismatic cells with constant magnetization that allows the recovery of a complete 3D generating source. As the number of cells are normally grater than the amount of available data, we are left with an underdetermined linear inverse problem, which can be regularized in order to obtain an unique solution by a depth-weighting function, adapted from Li and Oldenburg (1996) to close the source towards its bottom. The main novelty of this method is a first-stage optimization that gives information about the depth-to-the-bottom (dtb) of the generating source. This parameter permits both the evaluation of the appropriate vertical extension of the mesh, and the definition of the shape of the regularizing depth-weighting distribution. The adopted method is suitable under appropriate changes to deal also with gravity data. After showing which kind of a priori information is introduced by this particular regularization, we will describe its limits and its possible improvements and then we will show the results of some synthetic tests. As a final application we will show the 3D magnetic model of an interesting volcanic region in Italy.126 69 - PublicationRestrictedAcquisizione magnetica marina dell'alto strutturale del Mt. Vercelli (Mar Tirreno Centrale) e del Golfo di Napoli: descrizione dei rilievi e primi risultati(2010-10)
; ; ; ; ; ; ;Cocchi, Luca; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Muccini, Filippo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, Cosmo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Vagni, Riccardo; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Berrino, Giovanna; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Masetti, Giuseppe; Istituto Idrografico della Marina; ; ; ; ; Durante la Campagna Oceanografica Ver2010, effettuata nel mese di Maggio 2010, sono stati acquisiti due set di dati geomagnetici marini in alta risoluzione relativi alle aree del Mt. Vercelli (Mar Tirreno Centrale) e del Golfo di Napoli. Tale attività di ricerca è stata resa possibile grazie alla collaborazione tra l’Istituto Nazionale di Geofisica e Vulcanologia (INGV) e l’Istituto Idrografico della Marina (IIM) in forza di un accordo di cooperazione “Co.Na.Ge.M” (Coordinamento Nazionale per la Geofisica Marina). I due rilievi sono stati svolti mediante l’impiego della Nave Idro-oceanografica “Aretusa”, unità navale dell’Istituto Idrografico della Marina con scafo a catamarano in vetroresina e, pertanto, particolarmente adatta a rilievi di tipo geomagnetico. Il survey geofisico del seamount Vercelli rientra nel Progetto TySec – Prin 2007 (Università degli Studi di Genova, Università Politecnica delle Marche e INGV) ed è finalizzato alla valutazione delle caratteristiche geologiche, morfologiche e idrodinamiche dell’area del seamount . I dati geomagnetici marini del Golfo di Napoli vanno ad integrare il precedente data-set acquisito nel maggio 2008 e permettono nel contempo di definire una nuova mappa in alta risoluzione del golfo.351 70 - PublicationOpen AccessPotential-Field Inversion for Topographic Sources with Uncorrelated Top and Bottom(2007-04-15)
; ; ; ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;; Inversion of large-scale potential-field anomalies usually proceeds in the Fourier domain, where a large amount of data can be properly addressed. The commonly adopted geometry is based on a layer of constant thickness, i.e. with a bottom level at a fixed distance from the top level. We propose a method that overcomes this limiting geometry by inverting in the usual iterating scheme for top and bottom levels of any shape. Randomly generated synthetic models will be explored both for gravity and magnetic data, and finally the good performance of this method will be tested by the real isostatic residual anomaly of the Tyrrhenian Sea in Italy. The final result is a density model that allows the investigation of the distribution of the oceanic crust in this region, which is still a point under discussion.131 128 - PublicationOpen AccessDetermining the optimal Bouguer density for a gravity data-set(2007-05-22)
; ; ; ; ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Graziano, F. ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ;; Two methods are commonly adopted to evaluate the optimal Bouguer density for a given data-set, starting from different data characteristics or geological regime, giving in many cases different results. We propose some simple extension of these methods in order to make their results compatible. To this aim, we have used free-air gravity satellite data from Geosat and ERS-1 missions in order to compile a Bouguer gravity map of the Mediterranean Sea. The complete Bouguer correction has been applied by using the method of Parker (1972), that acts in the Fourier domain and allows for an exact evaluation of the gravity contribution from an highly sampled topographic model of the land. The density used for the Bouguer reduction has been obtained thus from the gravity data-set itself, by using two different optimization methods that have given the same optimal result of 2400 kg/m3. We have studied the radial power spectrum of the data, choosing the optimal Bouguer density as the one that minimizes its slope, i.e. the fractal dimension of the resulting gravity map in the band of wavelength from 45 km to 105 km. The second approach consists of studying the correlation between topography and Bouguer anomaly by spatial crossplots for a significant sub-set of the data. In the past these methodologies were applied alternatively since they gave different optimization values, especially the second method that seems to ignore large-wavelength isostatic effects. The main novelty of our work is represented by the combined application of both the approaches having as common goal the reduction of the short-wavelength effects of topography in the gravity map. Actually we have revisited both the methodologies, proposing slight modifications to make their efforts compatible. Their coincident results confirm their validity of application and give reliability to the recovered value of the Bouguer optimal density. As a first result we have obtained a revised Bouguer map for the Mediterranean Sea, that is useful for large-scale geological studies. Moreover, studying the correlation between Bouguer anomaly and bathymetry, we propose the compilation of a new interpretative tool that may be considered a sort of normalized correlation map defining the 2D isostatic setting of the investigated region, without introducing any lithospheric model. In a direct way we have found that the over-all region seems to be in a complete isostatic equilibrium apart from the young basins of Tyrrhenian Sea and Aegean Sea, confirming previous similar results.345 150 - PublicationRestrictedMapping of seafloor hydrothermally altered rocks using geophysical methods: Marsili and Palinuro seamounts, Southern Tyrrhenian Sea(2014-12)
; ; ; ; ; ; ; ; ;Ligi, M.; CNR-ISMAR ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bortoluzzi, G.; CNR-ISMAR ;D'Oriano, F.; CNR-ISMAR ;Muccini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Caratori Tontini, F.; GNS Science ;de Ronde, C.; GNS Science ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ;; 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.413 36 - PublicationOpen AccessInterpreting marine magnetic anomalies in the Fourier domain(2004-10-26)
; ; ; ; ;Caratori Tontini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carmisciano, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cocchi, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Stefanelli, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;; ; Magnetic data play a key role in interpretation of deep sources, mostly when they are not easily investigable by other direct methods as in the case of oceanic crust. The most striking problem connected with magnetic data however, is due to their difficult quantitative interpretation that in final analysis derive from the mathematical properties of Laplace equation. Dipolarity increases these difficulties with respect to other potential fields as gravity, so that magnetic data are far from being interpretable “by eye”. The actual methods for reconstruction of crustal sources that reproduce or enhance magnetic observations will be shown, differentiated for 3D or 2D analysis, showing their benefits and/or their disadvantages if applied to marine magnetic data. We will show the results obtained applying a new linear inverse filter on a high-quality data set in the Tyrrhenian Sea, demonstrating the utility of Fourier 2D modelling when there is a large number of data to be interpreted.144 125