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Praticelli, N.
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Praticelli, N.
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- PublicationRestrictedAdventive hydrothermal circulation on Stromboli volcano (Aeolian Islands, Italy) revealed by geophysical and geochemical approaches: Implications for general fluid flow models on volcanoes(2010)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Finizola, A.; Laboratoire GéoSciences Réunion, UR, IPGP, UMR 7154, Saint Denis, La Réunion, France ;Ricci, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Deiana, R.; Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy ;Barde Cabusson, S.; Dipartimento di Scienze della Terra, Università di Firenze, Firenze, Italy ;Rossi, M.; Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy ;Praticelli, N.; Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy ;Giocoli, A.; Laboratorio di Geofisica, IMAA-CNR, Tito Scalo, Potenza, Italy ;Romano, G.; Tito Scalo, Potenza, Italy ;Delcher, E.; ;Suski, B.; Institut de Géophysique, Université de Lausanne, Lausanne, Switzerland ;Revil, A.; Colorado School of Mines, Illinois St. Golden, Colorado, USA; CNRS-LGIT, UMR 5559, Université de Savoie, Equipe Volcan, Le Bourget du Lac, France ;Menny, P.; Laboratoire Magmas et Volcans, Université Blaise Pascal, Clermont-Ferrand, France ;Di Gangi, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Letort, J.; Ecole et Observatoire des Sciences de la Terre, Université de Strasbourg, France ;Peltier, A.; Institut de Physique du Globe de Paris, UMR 7154, Paris, France ;Villasante-Marcos, V.; Instituto Geografico Nacional, Madrid, Spain ;Douillet, G.; Ecole et Observatoire des Sciences de la Terre, Université de Strasbourg, France ;Avard, G.; Department of Geological Sciences, University of Missouri, USA ;Lelli, M.; Istituto di Geoscienze e Georisorse, CNR, Pisa, Italy; ; ; ; ; ; ; ; ;; ; ; ; ; ; ; ; ; On March 15th 2007 a paroxysmal explosion occurred at the Stromboli volcano. This event generated a large amount of products,mostly lithic blocks, someofwhich impacted the ground as far as down to 200 m a.s.l., about 1.5 kmfaraway fromthe active vents. Two days after the explosion, a newvapouremissionwas discovered on the north-eastern flank of the volcanic edifice, at 560 m a.s.l., just above the area called “Nel Cannestrà”. This new vapour emission was due to a block impact. In order to investigate the block impact area to understand the appearance of the vapour emission, we conducted on May 2008 a multidisciplinary study involving Electrical Resistivity Tomography (ERT), Ground Penetrating Radar (GPR), Self-Potential (SP), CO2 soil diffuse degassing and soil temperature surveys. This complementary data set revealed the presence of an anomalous conductive body, probably related to a shallow hydrothermal level, at about 10–15 m depth, more or less parallel to the topography. It is the first time that such a hydrothermal fluid flow,with a temperature close to thewater boiling point (76 °C) has been evidenced at Stromboli at this low elevation on the flank of the edifice. The ERT results suggest a possible link between (1) the main central hydrothermal system of Stromboli, located just above the plumbing system feeding the active vents, with a maximum of subsurface soil temperature close to 90 °C and limited by the NeoStromboli summit crater boundary and (2) the investigated area of Nel Cannestrà, at ~500 m a.s.l., a buried eruptive fissure active 9 ka ago. In parallel, SP and CO2 soil diffuse degassingmeasurements suggest in this sector at slightly lower elevation fromthe block impact crater a magmatic and hydrothermal fluid rising system along the N41° regional fault. A complementary ERT profile, on May 2009, carried out from the NeoStromboli crater boundary downto the block impact crater displayed a flank fluid flowapparently connected to a deeper system. The concept of shallow hydrothermal level have been compared to similar ERT results recently obtained onMount Etna and La Fossa cone of Vulcano. This information needs to be taken into account in general fluid flow models on volcanoes. In particular, peripheral thermal waters (as those bordering the northeastern coast of Stromboli) could be contaminated by hydrothermal and magmatic fluids coming from regional faults but also from the summit.559 30 - PublicationRestrictedA structural and geophysical approach to the study of fractured aquifers in the Scansano-Magliano in Toscana Ridge, southern Tuscany, Italy(2009-07)
; ; ; ; ; ; ; ; ; ;Francese, R.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ;Mazzarini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Pisa, Pisa, Italia ;Bistacchi, A.; Dipartimento di Geologia e Geotecnologia, Università di Milano Bicocca, Milano, Italy ;Morelli, G.; Geostudi Astier S.r.l., Livorno, Italy ;Pasquarè, G.; Dipartimento di Geologia, Università di Milano, Milano, Italy ;Praticelli, N.; Dipartimento di Geoscienze, Università di Padova, Padova, Italy ;Robain, H.; Institute de Recherche pour le Développement, Bondy Cedex, France ;Wardell, N.; Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste, Italy ;Zaja, A.; Dipartimento di Geoscienze, Università di Padova, Padova, Italy; ; ; ; ; ; ; ; Fresh water availability has recently become a serious concern in the Italian Apennines, as various activities rely on a predictable supply. Along the ridge between Scansano and Magliano in Toscana, in southern Tuscany, the situation is further complicated by contamination of the nearby alluvial aquifers. Aquifers locally consist of thin fractured reservoirs, generally within low-permeability formations, and it can be difficult to plan the exploitation of resources based on conventional techniques. An integrated study based on geological data investigated the link between tectonics and groundwater circulation, to better define the hydrological model. After the regional identification of fault and fracture patterns, a major structure was investigated in detail to accurately map its spatial position and to understand the geometry and properties of the associated aquifer and assess its exploitation potential. The subsurface around the fault zone was clearly imaged using ground probing radar, two-dimensional and three-dimensional resistivity tomography, and three-dimensional shallow seismic surveys. The vertical and horizontal contacts between the different geological units of the Ligurian and Tuscan series were resolved with a high degree of spatial accuracy. Three-dimensional high-resolution geophysical imaging proved to be a very effective means of characterising small-scale fractured reservoirs.217 23 - PublicationOpen AccessMagnetotelluric investigations of the seismically active region of Northwest Bohemia: preliminary results(1999-02)
; ; ; ; ; ; ; ; ;Di Mauro, D.; Istituto Nazionale di Geofisica, Roma, Italy ;Volpi, G.; Istituto Internazionale per le Ricerche Geotermiche, Pisa, Italy ;Manzella, A.; Istituto Internazionale per le Ricerche Geotermiche, Pisa, Italy ;Zaja, A.; Università di Padova, Italy ;Praticelli, N.; Università di Padova, Italy ;Cerv, V.; Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic ;Pek, J.; Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic ;De Santis, A.; Istituto Nazionale di Geofisica, Roma, Italy; ; ; ; ; ; ; During 1997, within the framework of an Italian-funded scientific cooperation between Italy and the Czech Republic, a series of magnetotelluric (MT) soundings was carried out in the region of Northwest Bohemia (Czech Republic). This is one of the most seismically active areas in Central Europe, where micro-earthquake swarms frequently occur during the apparently quiescent intervals between large macro-seismic swarms. Fifteen MT stations were installed in an area of about 15 ´ 20 km2 where 80% of the seismicity of the entire region has been recorded since 1986. The area showed a high electromagnetic noise, possibly of high cultural origin from the nearby industrial zone of the Sokolov basin, which affected both the electric and the magnetic signals. The final data, carefully selected, were modeled by 2D and 3D techniques. The results show an extensive conductive structure in the depth range from 0.5 to 3 km. This structure could be connected with the locally buried granitic massif in the inhomogeneous metamorphic basement, probably accompanied by fracturation, thermo-metamorphism or paleofluids. Moreover, the presence of a conductive anomaly in the northern part of the investigated region could be linked to a lithological change in the metamorphic rocks (prevalence of phyllites over mica schists), which would even increase the effect of the granite.197 235