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Patella, Domenico
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Patella, Domenico
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Patella, D.
29 results
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- PublicationOpen AccessA probability tomography approach to the analysis of potential field data in the Campi Flegrei caldera (Italy)(2001-04)
; ; ; ;Iuliano, T.; Dipartimento di Scienze Fisiche, Università ;Mauriello, P.; Istituto per le Tecnologie Applicate ai Beni Culturali, CNR, Roma, Italy ;Patella, D.; Dipartimento di Scienze Fisiche, Università "Federico II", Napoli, ItalyI", Napoli, Italy; ; The results of the application of the 3D probability tomography imaging approach to the study of the Campi Flegrei (CF) caldera are presented and discussed. The tomography approach has been applied to gravity, magnetic and ground deformation data already available in literature. The analysis of the 3D tomographic images is preceded by a brief qualitative interpretation of the original survey maps and by an outline of the probability tomography approach for each geophysical prospecting method. The results derived from the 3D tomographic images are the high occurrence probabilities of both gravity and ground deformation source centres in the CF caldera under the town of Pozzuoli. A Bouguer negative anomaly source centre is highlighted in the depth range 1.6-2 km b.s.l., whereas a positive ground deformation point source, responsible for the bradyseismic crisis of 1982-1984, is estimated at a mean depth of 3-4 km b.s.l. These inferences, combined with the results of a previous analysis of magnetotelluric, dipolar geoelectrical and self-potential data, corroborate the hypothesis that the bradyseismic events in the CF area may be explained by hot fluids vertical advection and subsequent lateral diffusion within a trapped reservoir overlying a magma chamber.163 546 - PublicationOpen AccessApplication of unconventional geoelectrical methods to the hydrogeological examination of the Mt. S. Croce rock formations (Umbria, Italy) involved in a railway tunnel project(1994-11)
; ; ; ; ;Coppola, B.; Sezione di Geologia, Ferrovie dello Stato Sp.a., Roma, Italy ;Lapenna, V.; Istituto di Metodologie Avanzate di Analisi Ambientale, C.N.R., Potenza, Italy ;Mancini, M.; Sezione di Geologia, Ferrovie dello Stato Sp.a., Roma, Italy ;Patella, D.; Dipartimento di Geofisica e Vulcanologia, Università “Federico II”, Napoli, Italy; ; ; he project of doubling and developing of the railway line Orte-Falconara, committed by the Italian State Railway Company to the COMAVI Consortium (Rome, Italy), envisaged building the Mt. S. Croce tunnel, about 3200 m long between the stations of Narni and Nera Montoro (Umbria, ltaly). During the last phase of the feasibility project, a geophysical research based on geoelectrical prospecting methods was carried out to complement other geognostic investigations with the following goals: a) to outline the complex geotectonic model of the rock system, which will be affected by the new railway layout; b) to gain information on the hydrogeologic features of the survey area, in relation to the existing geologic situation and the consequent effects on the digging conditions of the tunnel and on the operation conditions of the railway layout. The geophysical work was thus organized according to the following scheme: a) execution of dipole electrical sounding pro-files, to depict a series of significant tomographic pseudosections, both across and along the new railway layout; b) execution of self-potential measurements, to draw an anomaly map over the whole hydrogeological network system in the survey area. The research provided information which has helped to improve the geological-structural model of the area and disclosed the hydrogelogic network, conforming to the classified field surface manifestations. At present, further detailed field investigations are being carried out, which confirm all the results obtained by the geoelectrical survey.179 599 - PublicationOpen AccessApplication of electric and electromagnetic methods to the definition of the Campi Flegrei caldera (Italy)(2000-04)
; ; ; ; ; ; ;Di Maio, R.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy ;Patella, D.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy ;Petrillo, Z.; Osservatorio Vesuviano, Ercolano, Napoli, Italy ;Siniscalchi, A.; Dipartimento di Geologia e Geofisica, Università di Bari, Italy ;Cecere, G.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy ;De Martino, P.; Osservatorio Vesuviano, Ercolano, Napoli, Italy; ; ; ; ; The results of an analysis of Dipolar Geoelectrical (DG), Magnetotelluric (MT) and Self-Potential (SP) data collected over the emerged portion of the Campi Flegrei (CF) caldera (South Italy) are presented. The DG and MT data are from previous surveys, while the SP data have been recently collected during a survey consisting of 265 pickup land sites. Although the emerged part of the CF caldera appears as a highly inhomogeneous structure, a few simple features have been highlighted through an integrated analysis of subsets of consistent data. A well resolved feature is the structural pattern of the caldera depression along a roughly E-W profile, deduced from a 2D combined interpretation of the MT and DG soundings. Resistivity dispersion effects have also been observed at both ends of this profile. They have been ascribed to the presence of hydrothermally altered zones related to the main fracture systems bordering the caldera. A pressure/temperature source body at a mean depth of about 5 km bsl under the Bay of Pozzuoli has been inferred from the analysis of the 3D SP tomography imaging.302 568 - PublicationOpen AccessI principi metodologici della magnetellurica su mezzi generalmente dispersivi(1993)
; ;Patella, D.; Dipartimento di Geofisica e Vulcanologia, Università degli studi "Federico II", Napoli, Italia136 803 - PublicationOpen AccessExamples of application of electrical tomographies and radar profiling to cultural heritage(2000-04)
; ; ; ; ;Cammarano, F.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy ;Di Fiore, B.; Istituto per le Tecnologie Applicate ai Beni Culturali, CNR, Roma, Italy ;Mauriello, P.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy ;Patella, D.; Dipartimento di Scienze Fisiche, Università «Federico II», Napoli, Italy; ; ; We present the results of an integrated application of the self-potential and resistivity methods to the recognition of buried remains in the archaeological site of Sumhuram (Khor-Rouri, Oman), and of the self-potential, resistivity and radar methods to the assessment of the state of conservation of the Aksum obelisk (Rome, Italy). A tomographic approach based on the concept of anomaly source occurrence probability was used for the analysis of the self-potential and resistivity data. Tomographic imaging provided reliable space patterns of the most probable specific target boundaries and notably improved the information quality of each single geophysical method.252 559 - PublicationOpen AccessAbout the shallow resistivity structure of Vesuvius volcano(2008-02)
; ; ; ; ; ; ; ; ;Troiano, A.; Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy ;Petrillo, Z.; Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy ;Di Giuseppe, M. G.; Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy ;Balasco, M.; Istituto di Metodologie per l’Analisi Ambientale (IMAA, CNR), Tito Scalo (Pz), Italy ;Diaferia, I.; Dipartimento di Geologia e Geofisica, Università degli Studi di Bari, Italy ;Di Fiore, B.; Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy ;Siniscalchi, A.; Dipartimento di Geologia e Geofisica, Università degli Studi di Bari, Italy ;Patella, D.; Dipartimento di Fisica, Università degli Studi di Napoli «Federico II», Napoli, Italy; ; ; ; ; ; ; Magnetotelluric (MT) soundings performed in the past in the volcanic area of Mt. Vesuvius by two independent research groups showed in the same places MT apparent resistivity curves with very similar shape, but statically shifted by one order of magnitude, at least. To try to resolve this ambiguity new controlled source audio-magnetotelluric (CSAMT) measurements have been carried out in the same MT sites. The interpretation of the CSAMT dataset, combined with that of two shallow dipole-dipole geoelectrical resistivity tomographies previously carried out in the area have allowed a reliable electrical structure to be recovered down to a few km of depth, which will next be used for a best constrained re-interpretation of the deep MT soundings.449 746 - PublicationOpen AccessSelf-potential anomalies in some Italian volcanic areas(1996-01)
; ; ; ; ; ; ;Di Maio, R.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Di Sevo, V.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Giammetti, S.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Patella, D.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Piscitelli, S.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy ;Silenziario, C.; Dipartimento di Geofisica e Vulcanologia, Università «Federico II», Napoli, Italy; ; ; ; ; The study of Self-Potential (SP) space and time variations in volcanic areas may provide useful information on both the geometrical structure of the volcanic apparatuses and the dynamical behaviour of the feeding and uprising systems. In this paper, the results obtained on the islands of Vulcano (Eolian arc) and Ponza (Pontine archipelago) and on the Mt. Somma-Vesuvius complex are shown. On the island of Vulcano and on the Mt. Somma-Vesuvius apparatus areal SP surveys were performed with the aim of evidencing anomalies closely associated to the zones of major volcanic activity. On the island of Vulcano a profile across the fumaroles along the crater rim of the Fossa Cone was also carried out in order to have a direct relationship between fumarolic fracture migration and flow rate and SP anomaly space and time variations. The areal survey on the island of Ponza, which is considered an inactive area, is assumed as a reference test with which to compare the amplitude and pattern of the anomalies in the active areas. A tentative interpretation of the SP anomalies in volcanic areas is suggested in terms of electrokinetic phenomena, related to the movement of fluids of both volcanic and non-volcanic origin.201 10641 - PublicationOpen AccessA geophysical k-means cluster analysis of the Solfatara-Pisciarelli volcano-geothermal system, Campi Flegrei (Naples, Italy)(2018)
; ; ; ; ; ; ; ;; We present an application of the k-means cluster analysis technique to a trivariate geophysical parameter set dis- tributed over a 3 km thick and 1.2 km long section through the geothermally active Solfatara-Pisciarelli area of the Campi Flegrei caldera (Italy). The data set consists of resistivity, P-wave velocity and density parameters, ex- tracted from previously modeled univariate sections through the selected profile and mapped in a joint param- eter 3D space. Six compact and separated clusters have been identified. A subsequent linear regression statistics has allowed two distinct branches of clusters to be recognized, each represented in the joint parameter space by the equation of a plane. Each equation and its partial derivatives define the peculiar combinations among the used parameters. Once mapped back to the space domain, the final image has provided a grouping of the struc- tures in two superimposed blocks with an irregular interface located at 2 km mean depth. Based on drilling data, subsurface stratigraphy and recent seismic activity, the interface between the two blocks has been interpreted in terms of a substantial change in the rocks rheology inside the Solfatara-Pisciarelli volcano-geothermal system, namely the brittle-to-ductile transition.332 520 - PublicationRestrictedElectromagnetic outline of the Solfatara-Pisciarelli hydrothermal system, Campi Flegrei (Southern Italy)(2014)
; ; ; ; ; ; ; ;; We describe the results from a combined controlled source audio magnetotelluric (CSAMT) and natural source magnetotelluric (MT) survey carried out in the Solfatara–Pisciarelli (S–P) area, located in the central part of the Campi Flegrei (CF) composite caldera, west of Naples, Southern Italy. The S–P area represents the most active zone within the CF caldera, in terms of hydrothermal manifestations and local seismicity. Since 1969, the CF caldera is experiencing ground deformation, seismicity and geochemical fluid changes, which are particularly ev- ident in the S–P area. A 1 km long, nearly W–E directed CSAMT–MT profile crossing the fumarole field was carried out in the S–P area with the aim of deducting a resistivity model of the structural setting of the hydrothermal system in the first 3 km depth. An interpretation of the modelled section across the profile is given in this paper, taking advantage from already existing seismic, gravity and geochemical data in the same area. Three well distinct zones have been outlined. The first zone is a very shallow, electrically conductive body localized be- neath the westernmost segment of the profile, which, within a short distance of about 100 m, dips westwards from near surface down to some hundred metres in depth. Mostly accounting for the very low resistivity (1–10 Ω m) and the exceedingly high values of vP/vS (N4), this shallow zone has been ascribed to a water- saturated, high-pressurized geothermal reservoir. The second zone, which has been localized below the west- central portion of the CSAMT–MT transect, appears as a composite body made up of a nearly vertical plumelike structure that escapes at about 2.25 km depth from the top edge of the east side of a presumably horizontal plate- like body. The plumelike structure rises up to the free surface in correspondence of the fumarole field, whereas the platelike structure deepens at least down to the 3 km of maximum exploration depth. The combined interpretation of resistivity (50–100 Ω m), body wave velocity ratio (vP/vS b 2.0), mass density contrast (Δσ b 0 g/cm3), and geochemical data indicates that the plumelike portion can likely be associated with a steam/gas- saturated column and the platelike portion with a high temperature (N300 °C), over-pressurized, gas- saturated reservoir. Finally, the third zone, which has been localized beneath the eastern half of the transect, from about 1.2 km down to about 3 km of depth, is also characterized by very low resistivity values (1–10 Ω m). Jointly interpreted with seismic (vP/vS b 1.73) and gravity (⨂ N 0 g/cm3) data, this last electrically conduc- tive structure appears to be associated with a hydrothermally mineralized, clay-rich body.132 5 - PublicationRestrictedImaging 2D structures by the CSAMT method: application to the Pantano di S. Gregorio Magno faulted basin (Southern Italy)(2009-03-24)
; ; ; ; ;Troiano, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Di Giuseppe, M. G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Petrillo, Z.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Patella, D.; Department of Physical Sciences, University Federico II, Naples, Italy; ; ; A controlled source audiofrequency magnetotelluric (CSAMT) survey has been undertaken in the Pantano di San Gregorio Magno faulted basin, an earthquake prone area of Southern Apennines in Italy. A dataset from 11 soundings, distributed along a nearly N-S 780 m long profile, was acquired in the basin’s easternmost area, where the fewest data are available as to the faulting shallow features. A preliminary skew analysis allowed a prevailing 2D nature of the dataset to be ascertained. Then, using a single-site multi-frequency approach, Dantzig’s simplex algorithm was introduced for the first time to estimate the CSAMT decomposition parameters. The simplex algorithm, freely available online, proved to be fast and efficient. By this approach, the TM and TE mode field diagrams were obtained and a N35!W ± 10! 2D strike mean direction was estimated along the profile, in substantial agreement with the fault traces within the basin. A 2D inversion of the apparent resistivity and phase curves at seven almost noise-free sites distributed along the central portion of the profile was finally elaborated, reinforced by a sensitivity analysis, which allowed the best resolved portion of the model to be imaged from the first few meters of depth down to a mean depth of 300 m b.g.l. From the inverted section, the following features have been outlined: (i) a cover layer with resistivity in the range 3–30 ! m ascribed to the Quaternary lacustrine clayey deposits filling the basin, down to an average depth of about 35 m b.g.l., underlain by a structure with resistivity over 50 ! m up to about 600 ! m, ascribed to the Mesozoic carbonate bedrock; (ii) a system of two normal faults within the carbonate basement, extending down to the maximum best resolved depth of the order of 300 m b.g.l.; (iii) two wedge-shaped domains separating the opposite blocks of the faults with resistivity ranging between 30 ! m and 50 ! m and horizontal extent of the order of some tens of metres, likely filled with lacustrine sediments and embedded fine gravels.380 41
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