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  • 1
    Electronic Resource
    Electronic Resource
    The magnetotelluric response over 2D media with resistivity frequency dispersion (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 44 (1996), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: We investigate the magnetotelluric response of two-dimensional bodies, characterized by the presence of low-frequency dispersion phenomena of the electrical parameters. The Cole-Cole dispersion model is assumed to represent the frequency dependence of the ‘impedivity’ complex function, defined as the inverse of Stoyer's ‘admittivity’ complex parameter. To simulate real geological situations, we consider three structural models, representing a sedimentary basin, a geothermal system and a magma chamber, assumed to be partially or totally dispersive. From a detailed study of the frequency and space behaviours of the magnetotelluric parameters, taking known non-dispersive results as reference, we outline the main peculiarities of the local distortion effects, caused by the presence of dispersion in the target media. Finally, we discuss the interpretative errors which can be made by neglecting the dispersion phenomena. The apparent dispersion function, which was defined in a previous paper to describe similar effects in the one-dimensional case, is again used as a reliable indicator of location, shape and spatial extent of the dispersive bodies. The general result of this study is a marked improvement in the resolution power of the magnetotelluric method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1996.tb00174.x
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    Paper (German National Licenses)
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  • 2
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    Electric and electromagnetic outline of the Mount Somma–Vesuvius structural setting (1998)
    Elsevier
    Details
    Publication Date: 1998-06-01
    Print ISSN: 0377-0273
    Electronic ISSN: 1872-6097
    Topics: Geosciences
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    The magnetotelluric response over 2D media with resistivity frequency dispersion1 (1996)
    Wiley
    Details
    Publication Date: 1996-09-01
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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  • 4
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    Examples of application of electrical tomographies and radar profiling to cultural heritage (2006)
    Details
    Publication Date: 2020-12-03
    Description: 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.
    Description: JCR Journal
    Description: open
    Keywords: applied geophysics ; cultural heritage ; electrical tomography ; radar profiling ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 5354794 bytes
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  • 5
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    Integration of high resolution geophysical methods. Detection of shallow depth bodies of archaeological interest (2006)
    Details
    Publication Date: 2020-12-03
    Description: A combined survey using ground penetrating radar, self-potential, geoelectrical and magnetic methods has been carried out to detect near-surface tombs in the archaeological test site of the Sabine Necropolis at Colle del Forno, Rome, Italy. A 2D data acquisition mode has been adopted to obtain a 3D image of the investigated volumes. The multi-methodological approach has not only demonstrated the reliability of each method in delineating the spatial behaviour of the governing parameter, but mainly helped to obtain a detailed physical image closely conforming to the target geometry through the whole set of parameters involved.
    Description: JCR Journal
    Description: open
    Keywords: applied geophysics ; archaeology ; integrated approach ; tomographic imaging ; 04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 2841223 bytes
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  • 6
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    Examples of application of tensorial resistivity probability tomography to architectonic and archaeological targets (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: We present the results of the application of the tensor resistivity method to the assessment of the state of conservation of some architectonic features of the S.Giovanni a Carbonara monumental monastery (Naples, Italy) and to the recognition of buried remains in the archaeological site of the roman Port of Claudius at Fiumicino (Rome, Italy). The 3D tomographic approach, based on the concept of resistivity anomaly source occurrence probability, has been used for the analysis of the invariant parameter related to the trace of the determinant of the apparent resistivity tensor.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: applied geoelectrics– - tomography – cultural heritage ; apparent resistivity tensor ; probability ; tomography ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 667400 bytes
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  • 7
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    Examples of ac resistivity prospecting in archaeological research (2006)
    Details
    Publication Date: 2019-11-04
    Description: In this paper we present the results of an alternating current resistivity survey, with a view to future tomographic processing. Two examples are given to evaluate the validity and the resolution of the method. The first in the Sabine Necropolis of Colle del Forno (Montelibretti, Rome), the second in the Etruscan settlement of Poggio Colla (Vicchio, Florence). All the measurements were carried out utilising current up to 512 Hz and a mobile dipole MN along straight lines, having two fixed current probes A and B. It was found that skin effect is uninfluential in the frequency range adopted. Given the absence of natural or artificial disturbances in the signal (e.g. electrode polarization and self potential), it was possible to perform very fast measurements with two operators only. Moreover, the use of a multiple dipole source configuration allows the calculation of the determinant of the apparent resistivity tensor. In the examples shown, this parameter detects the actual position of buried structures independently of the direction of the electric sources.
    Description: JCR Journal
    Description: open
    Keywords: applied geophysics ; archaeological prospecting ; geoelectric ; alternating current ; 04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 1752959 bytes
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  • 8
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    Self-potential, geoelectric and magnetotelluric studies in Italian active volcanic areas (2006)
    Details
    Publication Date: 2019-11-14
    Description: We present the results of self-potential, geoelectric and magnetotelluric studies in Italian active volcanic areas as essential contributions both to structural modeling and to hazard evaluation. On Mt. Etna and Mt. Somma-Vesuvius complexes structural modeling was emphasized due to a lack of global information involving the whole apparatuses, at least from the electrical point of view. Hazard investigation was, instead, investigated with high resolution techniques on the island of Vulcano, where intense unrest phenomena have long been recorded.
    Description: JCR Journal
    Description: open
    Keywords: self-potential ; dipolar geoelectrics ; magnetotellurics ; volcanoes ; 04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Integration of geophysical datasets by a conjoint probability tomography approach: application to Italian active volcanic areas (2009)
    Details
    Publication Date: 2019-11-04
    Description: We expand the theory of probability tomography to the integration of different geophysical datasets. The aim of the new method is to improve the information quality using a conjoint occurrence probability function addressed to highlight the existence of common sources of anomalies. The new method is tested on gravity, magnetic and self-potential datasets collected in the volcanic area of Mt. Vesuvius (Naples), and on gravity and dipole geoelectrical datasets collected in the volcanic area of Mt. Etna (Sicily). The application demonstrates that, from a probabilistic point of view, the integrated analysis can delineate the signature of some important volcanic targets better than the analysis of the tomographic image of each dataset considered separately.
    Description: 167 - 180
    Description: JCR Journal
    Description: open
    Keywords: integration of geophysical methods ; probability tomography ; active volcanic areas ; 04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    A probability tomography approach to the analysis of potential field data in the Campi Flegrei caldera (Italy) (2006)
    Details
    Publication Date: 2019-11-04
    Description: 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.
    Description: JCR Journal
    Description: open
    Keywords: applied geophysics ; potential fields ; probability tomography ; Campi flregrei caldera ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 6032607 bytes
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