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  • 1
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    Volcanic soils and landslides: the case study of the Ischia island (southern Italy) and relationship with other Campania events (2015)
    Copernicus
    Details
    Publication Date: 2015-01-06
    Description: An integrated investigation has been carried out over the soils involved in the landslide phenomena occurred in the 2006 at Mt. Vezzi in the Ischia island (southern Italy). Chemical, physical (i.e. particle size distribution, hydrological analyses and direct measurements of soil porosity), mineralogical and micromorphological properties of three soil profiles selected in two of the main detachment crowns were analysed. The studied soils, having a volcanic origin, showed a substantial abrupt discontinuity of all the studied properties in correspondence of the 2C horizon, also identified as sliding surface of the landslide phenomena. With respect to the above horizons, the 2C showed (i) as a grey fine ash, almost pumices free, with a silt content increased by the 20%, (ii) ks values one order of magnitude lower, (iii) a porosity concentrated in the small size (15 to 30 μm modal class) pores characterized by very low percolation threshold (around 15–25 μm), (iv) occurrence of expandable clay minerals and (v) higher Na content in the exchange complex. Therefore, most of these properties indicated 2C as a lower permeability horizon than the above. Nevertheless, only the identification of a thin (6.5 mm) finely stratified ash layer on the top of 2C enabled to assume this interface as an impeding layer to vertical and horizontal water fluxes, as testified by the hydromorphic features (e.g. Fe / Mn concretions) within and on the top of the layer. Despite the Mt. Vezzi soil environment has many properties (high gradient northern facing slope, similar forestry, volcanic origin of the parent material) in common with those of many Campania debris-mud flows, the results of this study did not support the found relationship between Andosols and debris-mudflows, but emphasize the role of vertical discontinuities as landslide predisposing factor.
    Electronic ISSN: 1869-9537
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 2
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    Volcanic soils and landslides: a case study of the island of Ischia (southern Italy) and its relationship with other Campania events (2015)
    Copernicus
    Details
    Publication Date: 2015-06-26
    Description: An integrated investigation was carried out on the volcanic soils involved in the landslide phenomena that occurred in 2006 at Mt. Vezzi on the island of Ischia (southern Italy). Chemical (soil pH, organic carbon content, exchangeable cations and cation exchange capacity, electrical conductivity, Na adsorption ratio and Al, Fe and Si forms), physical (particle and pore size distribution, pore structure), hydrological (soil water retention, saturated and unsaturated hydraulic conductivity), mineralogical and micromorphological analyses were carried out for three soil profiles selected in two of the main head scarps. The studied soils showed a substantial abrupt discontinuity in all the studied properties at the interface with a buried fine ash layer (namely, the 2C horizon), that was only marginally involved in the sliding surface of the landslide phenomena. When compared to the overlying horizons, 2C showed (i) fine grey ash that is almost pumice free, with the silt content increasing by 20 %; (ii) ks values 1 order of magnitude lower; (iii) a pore distribution concentrated into small (15–30 μm modal class) pores characterised by a very low percolation threshold (approximately 15–25 μm); (iv) the presence of expandable clay minerals; and (v) increasing Na content in the exchange complex. Most of these properties indicated that 2C was a lower permeability horizon compared to the overlying ones. Nevertheless, it was possible to assume this interface to be an impeding layer to vertical water fluxes only by the identification of a thin (6.5 mm) finely stratified ash layer, on top of 2C, and of the hydromorphic features (e.g. Fe / Mn concretions) within and on top of the layer. Although Mt. Vezzi's soil environment has many properties in common with those of other Campania debris-mudflows (e.g. high gradient, north-facing slope, similar forestry, and volcanic origin of the parent material), the results of this study suggest a more complex relationship between soil properties and landslides and emphasise the role of vertical discontinuities as noteworthy predisposing factors.
    Print ISSN: 1869-9510
    Electronic ISSN: 1869-9529
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 3
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    Polyaniline/Zn-phthalocyanines nanocomposite for protecting zinc electrode in Zn-air battery (2019)
    Elsevier
    Details
    Publication Date: 2019-12-01
    Print ISSN: 0378-7753
    Electronic ISSN: 1873-2755
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Elsevier
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  • 4
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    Effect of rock fragments on soil porosity: a laboratory experiment with two physically degraded soils (2016)
    Wiley
    Details
    Publication Date: 2016-08-08
    Print ISSN: 1351-0754
    Electronic ISSN: 1365-2389
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 5
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    The role of rock fragments in crack and soil structure development: a laboratory experiment with a Vertisol (2015)
    Wiley
    Details
    Publication Date: 2015-05-26
    Print ISSN: 1351-0754
    Electronic ISSN: 1365-2389
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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  • 6
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    The seismic sequence of 30 th May - 9 th June 2016 in the geothermal site of Torre Alfina (central Italy) and related variations in soil gas emissions (2018)
    In:  Journal of Volcanology and Geothermal Research
    Details
    Publication Date: 2020-02-12
    Type: info:eu-repo/semantics/article
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  • 7
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    Borehole seismic surveys for the mechanical characterization of a calcarenite cliff in the area of Ispica (southern Sicily) (2015)
    Springer Berlin Heidelberg
    Details
    Publication Date: 2020-02-24
    Description: In this study, we investigate the mechanical properties of the substrate underlying the historical Franciscan Friars Minor convent of Ispica (southern Sicily). The convent, where new fractures recently occurred, is located on top of a calcarenite cliff formed along one of the planes of the regional Pozzallo-Ispica-Rosolini normal fault system. Taking advantage of three existing mechanical drillings 30 m deep, we have carried out down-hole tests (DHT) and a seismic tomography survey in up-hole configuration. The down-hole tests provided vertical profiles of P- and S-wave velocity measured at 1-m depth intervals, from which we have derived the basic elasto-dynamic and seismic parameters, while the tomography survey imaged vertical sections of P-wave velocity across the cliff. The results highlight variable mechanical properties of the subsoil and a step-like pattern of velocity variations parallel to the cliff face that could suggest the occurrence of secondary ruptures related to the main Ispica fault.
    Description: Published
    Description: 971–980
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: JCR Journal
    Description: reserved
    Keywords: down-hole tests, up-hole seismic tomography, Ispica, Sicily ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    Environmental pre-exploitation monitoring of Torre Alfina geothermal system (Central Italy) (2016)
    Details
    Publication Date: 2017-04-04
    Description: An interesting project of geothermal pilot plant, with no-gas emission in atmosphere, has been submitted for approval in the medium-enthalpy geothermal field of Torre Alfina. This prompted us to develop a geochemical and geophysical monitoring of the area with the aim of establishing a background information to reco-gnize anomalous gas emission, induced seismicity and subsidence, possibly related to the field exploitation. The exploration conducted by Enel in the years ‘70 - '80, including the drilling of 9 deep wells, has shown the existence of a medium-enthalpy geothermal field in the Torre Alfina zone, in central Italy. The area has been affected by a very complex geological evolution during the Neogene. It was affected by the Quaternary volcanism of the Tyrrhenian margin which, reached its climax between 0.6 and 0.3 Ma. The present stress field around Quaternary volcanoes of central Italy has a NE to ENE direction of extension, in agreement with the alignment of Quaternary volcanoes and earthquake fault plane solutions, with T axes preferentially oriented between NE and ENE.
    Description: Published
    Description: Prague, Czech Republic, June 22 to July 2, 2015
    Description: 6T. Sismicità indotta e caratterizzazione sismica dei sistemi naturali
    Description: open
    Keywords: Torre Alfina geothermal system ; pre-exploitation monitoring ; geothermal pilot plant ; geochemistry ; induced seismicity ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 9
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    Microseismicity recorded before geothermal exploitation at Torre Alfina (Italy), (Poster Session - ESC2016-464) (2016)
    Details
    Publication Date: 2017-04-04
    Description: The geothermal field of Torre Alfina is located in Central Italy at the northern extremity of the Vulsini quaternary volcanic complex. Wells drilled in the 1970s and 1980s down to depths ranging from 563 to 2710 m revealed that Torre Alfina is a medium-enthalpy (T=140 C) geothermal field, hosted in buried fractured Mesozoic limestones. Recently a multinational industrial company received the license for the production of geothermal energy up to a maximum of 5 MW. In 2013, the INGV was commissioned to realize a monitoring system that includes the observation of gas emissions, microseismicity and ground deformation. Following the recommendations, described in the Ministerial Decree that regulates the geothermal production activity, the seismic monitoring system should be capable to record the local microseismicity during the phase of geothermal energy production and the natural seismicity since 12 months before the beginning of the production operations. In 2014, we started to install a short-period seismic network called ReMoTA near the future geothermal production site of Torre Alfina. Stations are equipped with 24 bit digitizers and short-period seismometers. The seismic noise level recorded at the single stations is unfavorably high, due to an intensive colonization and numerous settlements of small and medium industries. Transients as well as persistent monochromatic disturbances are recorded very well especially at the southern stations, probably due to a low wave energy dissipation inside the layer of quaternary volcanic rocks. During the period from June 2014 – November 2015 ReMoTA recorded 289 local earthquakes and 19 quarry blasts, with respect to 46 seismic events reported by ISIDE. The depth distribution of the seismic events recorded during 18 months before the beginning of the geothermal exploitation is concentrated inside the upper crust at a depth range between 4 - 8 km. The spatial distribution of the hypocenters seems to dip slightly towards SW beneath the area of Torre Alfina. This tendency together with the focal solutions of the Dec 2014 seismicity cluster highlights the presence of a normal fault with a weak transverse component striking in NW-SE-direction, within splitting distance to the future geothermal production site. The other two seismicity cluster of Mar-2015 and Nov-2015 seem to delineate antithetic structures with respect to the main fault. Considering that the future production level will be at a depth range between 1500 – 2300 m, and being aware of the hypocentral uncertainties, the discrimination between “natural” earthquakes and seismicity triggered by anthropic activity will be an important challenge.
    Description: Unpublished
    Description: Trieste, Italy
    Description: 6T. Sismicità indotta e caratterizzazione sismica dei sistemi naturali
    Description: open
    Keywords: Monitoring ; Geothermic field ; Active tectonic ; Seismic analysis ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 10
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    Background electromagnetic noise characterization: the role of external and internal Eatrh sources (2016)
    INGV, Istituto Nazionale di Geofisica e Vulcanologia
    Details
    Publication Date: 2017-04-04
    Description: The Earth is surrounded by the ionosphere and magnetosphere that can roughly be seen schematically as two concentric shells. These two composed and inhomogeneous structured shells around the Earth selectively affect electromagnetic (EM) waves propagation. Both ionosphere and magnetosphere interact also with particles and waves coming from external sources, generating electromagnetic phenomena that in turn might become sources of EM waves. Conversely, EM waves generated inside the ionosphere remain confined at various altitudes in this region, up to a socalled critical frequency limit, depending on frequency, EM waves can escape out of the ionosphere and magnetosphere or get through. The EM waves generated inside the magnetospheric cavity mainly originate as a result of the electrical activity in the atmosphere. It is well known that also man-made sources, now widely spread on Earth, are a fundamental source of EM waves; however, excluding certain frequencies employed in power distribution and communication, man-made noise can be dominant only at local scale, near their source. According to recent studies, EM waves are also generated in the Earth’s lithosphere; these waves were sometimes associated with earthquake activity showing, on the Earth’s surface, intensities that are generally orders of magnitude below the background EM noise. In this review paper, we illustrate EM waves of natural origin and discuss their characterization in order to try discriminate those of lithospheric origin detectable at or near the Earth’s surface.
    Description: Published
    Description: G0330
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Description: open
    Keywords: Radio noise characterization, Ionosphere-magnetosphere, Background EM noise, Crustal/lithospheric EM sources. ; 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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