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La Delfa, Santo
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La Delfa, Santo
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- PublicationOpen AccessIndoor and soil radon measurements in the Hyblean Foreland (South-East Sicily)(2007-08)
; ; ; ; ; ; ; ;Antoci, C.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;Immè, G.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;La Delfa, S.; Dipartimento di Scienze Geologiche, Università degli Studi di Catania, Italy ;Lo Nigro, S.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;Morelli, D.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;Patanè, G.; Dipartimento di Scienze Geologiche, Università degli Studi di Catania, Italy ;Alessandro, G.; Provincia Regionale di Ragusa, Settore Geologia e Geognostica, Ragusa (RG), Italy; ; ; ; ; ; Indoor radon behavior in two sites of SE Sicily was studied as a function of the soil radon concentration. The chosen locations were Ragusa and Modica towns, placed in the Hyblean Plateau (northern margin of the African Plate). Soil samples were analysed by gamma spectrometry to determine the amount of radionuclides. Indoor air and soil gas radon measurements were simultaneously performed in both sites using active detectors. Radon in soil was measured one meter deep. A positive correlation was obtained between indoor radon concentration and the soil gas concentration.207 377 - PublicationOpen AccessRadionuclide measurements as tool for geophysical studies on Mt. Etna Volcano (Sicily)(2010-05-24)
; ; ; ; ; ; ; ; ; ;Morelli, Daniela; Dipartimento di Fisica e Astronomia - Università degli studi di Catania – Via S. Sofia, 64, 95123 Catania-Italy ;Immè, Giuseppina; Dipartimento di Fisica e Astronomia - Università degli studi di Catania – Via S. Sofia, 64, 95123 Catania-Italy ;Altamore, Ilaria; Dipartimento di Fisica e Astronomia - Università degli studi di Catania – Via S. Sofia, 64, 95123 Catania-Italy ;Cammisa, Silvia; Dipartimento di Fisica e Astronomia - Università degli studi di Catania – Via S. Sofia, 64, 95123 Catania-Italy ;Giammanco, Salvatore; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Mangano, Gabriella; Dipartimento di Fisica e Astronomia - Università degli studi di Catania – Via S. Sofia, 64, 95123 Catania-Italy ;La Delfa, Santo; Dipartimento di Scienze Geologiche – Università degli Studi di Catania – Corso Italia 57, 95129 Catania-Italy ;Neri, Marco; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Patanè, Giuseppe; Dipartimento di Scienze Geologiche – Università degli Studi di Catania – Corso Italia 57, 95129 Catania-Italy; ; ; ; ; ; ; ; Radionuclide measurements as tool for geophysical studies on Mt. Etna Volcano (Sicily)211 165 - PublicationRestrictedRadiation measurements as tool for environmental and geophysics studies on volcano-tectonic areas(2011-01)
; ; ; ; ; ; ; ; ; ; ; ; ;Morelli, D.; Dipartimento di Fisica e Astronomia, Università di Catania ;Immé, G.; Dipartimento di Fisica e Astronomia, Università di Catania ;Altamore, I.; Dipartimento di Fisica e Astronomia, Università di Catania ;Aranzulla, M.; Dipartimento di Fisica e Astronomia, Università di Catania ;Cammisa, S.; Dipartimento di Fisica e Astronomia, Università di Catania ;Catalano, R.; Dipartimento di Fisica e Astronomia, Università di Catania ;Giammanco, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;La Delfa, S.; Dipartimento di Scienze Geologiche, Università di Catania ;Mangano, G.; Dipartimento di Fisica e Astronomia, Università di Catania ;Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Patané, G.; Dipartimento di Scienze Geologiche, Università di Catania ;Rosselli Tazzer, A.; Dipartimento di Fisica e Astronomia, Università di Catania; ; ; ; ; ; ; ; ; ; ; In the last years there has been an increasing concern about natural- radioactivity measurements both from the point of view of the environmental survey, especially for the human health protection, and of the geophysical-events investiga- tion in volcanic areas and tectonic fault zones. We report on our activity in both these fields, in particular on the measurements of indoor radon concentration in a long-term passive monitoring in dwellings of the eastern region of Sicily. Because this region is characterized by high seismicity, besides the indoor radioactivity sur- vey, in-soil radon measurements in the region (both volcanic and tectonic area) can provide a better insight and a valuable database for the study related to radon anomalies. A synthesis is reported of the results that we obtained, in the last years, in the volcanic and tectonic area of oriental Sicily both from indoor monitoring and from geophysical-events investigation.393 74 - PublicationRestrictedNew archeomagnetic and 226Ra-230Th dating of recent lavas for the Geological map of Etna volcano(2012)
; ; ; ; ; ;Tanguy, J.-C. ;Condomines, M. ;Branca, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;La Delfa, S. ;Coltelli, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ; ;; ;This work deals with the dating of Mount Etna lava flows and eruptive fissure deposits to the last four millennia following field investigations and stratigraphic data (BRANCA et alii, 2011a). We have studied 24 of these volcanic products, including 301 large samples, through high precision archeomagnetic dating checked by 226Ra-230Th radiochronology, thus providing additional material to the previous paper by TANGUY et alii (2007). In most cases our results allow attributing ages to the historical period, although two flows are shown to be prehistoric. For the historic lavas, archeoma - gnetic ages can be defined within decades, except for three of them that erupted during a time span (Greco-Roman epoch) when the geomagnetic field underwent little variation. Although 60% of these volcanics exhibit ages comprised between 700 AD and 1850, only one (1285) is mentioned by contemporary written accounts. We conclude that i) historical documents alone are insufficient to reconstruct a coherent sequence of eruptions, and ii) a multidisciplinary approach is necessary to obtain a comprehensive eruptive history of such a very active volcano, useful for both scientific and civil protection purposes, even for such a geologically recent period as that of the last 10 or 20 centuries. Thanks to these new archeomagnetic and 226Ra-230Th data coupled with stratigraphic data, a comprehensive volcanic history of the still-outcropping Mount Etna volcanics is now available for the last 2,400 years.241 33 - PublicationOpen AccessGas radon emission related to geodynamic activity on Mt. Etna(2005)
; ; ; ; ; ;Immè, G.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;La Delfa, S.; Dipartimento di Scienze Geologiche, Università degli Studi di Catania, Italy ;Lo Nigro, S.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;Morelli, D.; Dipartimento di Fisica e Astronomia, Università degli Studi di Catania, Italy ;Patanè, G.; Dipartimento di Scienze Geologiche, Università degli Studi di Catania, Italy; ; ; ; We report preliminary observations on possible correlations between anomalies of subsoil radon concentration and geodynamical events on Mt. Etna. In recent years several studies have been carried out on radon as a precursor of geophysical events, most of them performed either on tectonic or volcanic areas. The peculiarity of our investigation lies on the choice of the etnean region, in which tectonic and volcanic features are both present. In order to characterize Mt. Etna features by investigating radon gas in soil, two stations were located along the NE-SW direction on Mt. Etna. Each of the two stations is fitted with a radon detector, a 3D seismic station and a meteorological station. Differences in the radon concentration trend in the data from north and south flanks could be linked to different faulting mechanisms and then to different mechanisms of radon uprising. The increase in soil radon concentration could be related to both seismic and volcanic events.229 304 - PublicationRestrictedRadionuclide measurements, viad ifferent methodologies, as tool for geophysical studies on Mt. Etna(2011-02-05)
; ; ; ; ; ; ; ; ; ;Morelli, D.; Dipartimento diFisicaeAstronomia,Universit a diCatania,viaS.Sofia,64I-95123Catania,Italy ;Immè, G.; Dipartimento diFisicaeAstronomia,Universit a diCatania,viaS.Sofia,64I-95123Catania,Italy ;Altamore, I.; Dipartimento diFisicaeAstronomia,Universit a diCatania,viaS.Sofia,64I-95123Catania,Italy ;Cammisa, S.; Dipartimento diFisicaeAstronomia,Universit a diCatania,viaS.Sofia,64I-95123Catania,Italy ;Giammanco, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;La Delfa, S.; Dipartimento diScienzeGeologiche,Universit a diCatania,CorsoItalia,57I-95127Catania,Italy ;Mangano, G.; Dipartimento diFisicaeAstronomia,Universit a diCatania,viaS.Sofia,64I-95123Catania,Italy ;Neri, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Patanè, G.; Dipartimento diScienzeGeologiche,Universit a diCatania,CorsoItalia,57I-95127Catania,Italy; ; ; ; ; ; ; ; Natural radioactivity measurements represent an interesting tool to study geodynamical events or soil geophysical characteristics. In this direction we carried out, in the last years, several radionuclide monitoring both in the volcanic and tectonic areas of the oriental Sicily. In particular we report in-soil Radon investigations, in a tectonic area, including both laboratory and in-site measurements, applying three different methodologies, based on both active and passive detection systems. The active detection devices consisted of solid-state silicon detectors equipped in portable systems for short-time measurements and for long-time monitoring. The passive technique consisted of solid-state nuclear track detectors (SSNTD), CR-39 type, and allowed integrated measurements. The performances of the three methodologies were compared according to different kinds of monitoring. In general the results obtained with the three methodologies seem in agreement with each other and reflect the tectonic settings of the investigated area.412 83 - PublicationOpen AccessIsochronal maps at Mt. Etna volcano (Italy): a simple and reliable tool for investigating large-scale heterogeneities(1997-10)
; ; ; ;Patanè, G.; Istituto di Geologia e Geofisica, Università di Catania, Italy ;Centamore, C.; Dipartimento di Geofisica e Vulcanologia, Università di Napoli «Federico II», Napoli, Italy ;La Delfa, S.; Istituto di Geologia e Geofisica, Università di Catania, Italy; ; This paper analyses twelve etnean earthquakes which occurred at various depths and recorded at least by eleven stations. The seismic stations span a wide part of the volcanic edifice; therefore each set of direct P-wave arrival times at these stations can be considered appropriate for tracing isochronal curves. Using this simple methodology and the results obtained by previous studies the authors make a reconstruction of the geometry of the bodies inside the crust beneath Mt. Etna. These bodies are interpreted as a set of cooled magmatic masses, delimited by low-velocity discontinuities which can be considered, at present, the major feeding systems of the volcano.149 129 - PublicationOpen AccessThe geodynamics of Mt. Etna volcano during and after the 1984 eruption(1999-06)
; ; ; ;La Delfa, S.; Istituto di Geologia e Geofisica, Università di Catania, Italy ;Patanè, G.; Istituto di Geologia e Geofisica, Università di Catania, Italy ;Centamore, C.; Dipartimento di Geofisica e Vulcanologia, Università di Napoli "Federico II", Napoli, Italy; ; Data concerning M > 2.5 earthquakes that occurred at Mt. Etna volcano (Sicily, Italy) during the period April 15th - October 29th, 1984 are here presented and discussed. Only those events with reliable focal mechanisms (at least eight polarities) have been considered. Instrumental information comes from local seismic networks run by the University of Catania and the CNRS (Grenoble, France). The results obtained support the hypothesis that the seismicity and the volcanic activity at Mt. Etna are related to a complex stress field, due to the combined effects of the tectonics associated with the interaction between the African and Eurasian plates and the movement of magma into the crust. In particular, we hypothesize that the tectonic forces caused the end of the 1984 eruption, by means of a "locking mechanism".139 352