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Colonge, J.
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Colonge, J.
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- PublicationRestrictedHydrogeology of Stromboli volcano, Aeolian Islands (Italy) from the interpretation of resistivity tomograms, self-potential, soil temperature and soil CO2 concentration measurements(2011)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Revil, A.; Colorado School of Mines, Department of Geophysics, Golden, CO 80401, USA ;Finizola, A.; Laboratoire GeoSciences Reunion, Universite de la Reunion, Institut de Physique du Globe de Paris, La Reunion, Indian Ocean, France ;Ricci, T.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Delcher, E.; Laboratoire GeoSciences Reunion, Universite de la Reunion, Institut de Physique du Globe de Paris, La Reunion, Indian Ocean, France ;Peltier, A.; Institut de Physique du Globe de Paris, France ;Barde-Cabusson, S.; Institute of Earth Sciences Jaume Almera, Consejo Superior de Investigaciones Cientıficas, Spain ;Avard, G.; Observatorio Vulcanologico y Sismologico de Costa Rica, Costa Rica ;Bailly, T.; Ecole et Observatoire des Sciences de la Terre, Universite de Strasbourg, France ;Bennati, L.; Earth and Atmospheric Sciences Department, Purdue University, West Lafayette, IN, USA ;Byrdina, S.; ISTerre, CNRS, UMR 5559, Universite de Savoie, Equipe Volcan, Le Bourget du Lac, France ;Colonge, J.; Ecole et Observatoire des Sciences de la Terre, Universite de Strasbourg, France ;Di Gangi, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Palermo, Palermo, Italia ;Douillet, G.; Ludwig Maximilians Universitaet, Munich, Germany ;Lupi, M.; University of Bonn, Steinmann Institute, Geodynamics/Geophysics, Germany ;Letort, J.; Ecole et Observatoire des Sciences de la Terre, Universite de Strasbourg, France ;Tsang Hin Sun, E.; Ecole et Observatoire des Sciences de la Terre, Universite de Strasbourg, France; ; ; ; ; ; ; ; ; ; ; ; ; ; ; To gain a better insight of the hydrogeology and the location of the main tectonic faults of Stromboli volcano in Italy, we collected electrical resistivity measurements, soil CO2 concentrations, temperature and self-potential measurements along two profiles. These two profiles started at the village of Ginostra in the southwest part of the island. The first profile (4.8 km in length) ended up at the village of Scari in the north east part of the volcano and the second one (3.5 km in length) at Forgia Vecchia beach, in the eastern part of the island. These data were used to provide insights regarding the position of shallow aquifers and the extension of the hydrothermal system. This large-scale study is complemented by two high-resolution studies, one at the Pizzo area (near the active vents) and one at Rina Grande where flank collapse areas can be observed. The Pizzo corresponds to one of the main degassing structure of the hydrothermal system. The main degassing area is localized along a higher permeability area corresponding to the head of the gliding plane of the Rina Grande sector collapse. We found that the self-potential data reveal the position of an aquifer above the villages of Scari and San Vincenzo. We provide an estimate of the depth of this aquifer from these data. The lateral extension of the hydrothermal system (resistivity ∼15–60 ohm m) is broader than anticipated extending in the direction of the villages of Scari and San Vincenzo (in agreement with temperature data recorded in shallow wells). The lateral extension of the hydrothermal system reaches the lower third of the Rina Grande sector collapse area in the eastern part of the island. The hydrothermal body in this area is blocked by an old collapse boundary. This position of the hydrothermal body is consistent with low values of the magnetization (<2.5 A m−1) from previously published work. The presence of the hydrothermal body below Rina Grande raises questions about the mechanical stability of this flank of the edifice.481 39