: Investigation of geothermal structures by magnetotellurics (MT): an exemple from the Mt. Amiata area, Italy. (Articolo in rivista)

Type
Label
  • : Investigation of geothermal structures by magnetotellurics (MT): an exemple from the Mt. Amiata area, Italy. (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Volpi G., Manzella A., Fiordelisi A. (2003)
    : Investigation of geothermal structures by magnetotellurics (MT): an exemple from the Mt. Amiata area, Italy.
    in Geothermics
    (literal)
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  • Volpi G., Manzella A., Fiordelisi A. (literal)
Pagina inizio
  • 131 (literal)
Pagina fine
  • 145 (literal)
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  • It has been demonstrated that MT data can be obtained in intensely industrialised and noisy areas, with due case taken during the acquisition and interpretation phases. It has been shown that the acquisition of remote-referenced data is a requisite for retrieving high-quality MT data, but that other conditions must also be fulfilled, such as using a really quiet remote site, and recording very long data segments. In our case the locally-referenced data were not overwhelmed by noise and the remote-reference data, although not good enough to be used on their own, nevertheless provided useful information to separate the noise effect from locally-referenced data. (literal)
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  • 32 (literal)
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  • The most productive areas of the Amiata geothermal fields were explored in an MT survey carried out during the summer of 1999, to investigate the relationship between the resistivity anomalies defined by MT data interpretation and the geothermal features of the Amiata area, in an area whose shallow structure is well known. The most significant result of this study is the presence of electrical discontinuities in the resistive underground below 2 km. These low resistivities were attributed to the deep geothermal conditions of the subsurface, as revealed by drilling data to depths of 4.5 km b.g.l. in the Amiata area. It is evident that geothermal overburden conditions do not produce strong anomalies in density and wave velocities, therefore a geothermal reservoir cannot be identified from seismic and gravimetric results alone, although they allow to recognise the geological units and their distribution. The only other physical parameter that is strongly affected by geothermal conditions is heat flow, which shows very high values in all the areas with an anomalously low resistivity. No indication of a deep conductor in the study area, such as that observed in the Larderello area and in other parts of Mt. Amiata, was found. It was concluded that the heat source of the geothermal system, represented by a cooling, but still hot, magmatic body, does not lie below this profile and is possibly not as hot and extensive as in the Larderello area. (literal)
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  • ISI Web of Science (WOS) (literal)
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  • Gianni Volpi1,2, Adele Manzella1*, Adolfo Fiordelisi2 1 CNR – Institute of Geosciences and Earth Resources, Via Moruzzi 1, 56124 Pisa, Italy. 2 ENEL Greenpower, Via A. Pisano120, 56100 Pisa, Italy (literal)
Titolo
  • : Investigation of geothermal structures by magnetotellurics (MT): an exemple from the Mt. Amiata area, Italy. (literal)
Abstract
  • During 1999 a magnetotelluric (MT) survey was carried out on the southern margin of the Mt. Amiata geothermal region (Tuscany, Italy), with the aim of defining the shallow and deep electric structures related to the local geothermal reservoirs and system heat recharge. Local and remote data were collected along a SW-NE profile and processed with two different robust algorithms. After a detailed study of the EM strike, the data were inverted and two-dimensional (2D) models of electrical resistivity and impedance phase were computed. The interpretation revealed a good correlation between the features of the geothermal field and resistivity distribution at depth. In particular, a shallow conductor (0.5-4 km) detected by the MT survey shows a good correlation with the areal extension of the geothermal reservoirs. (literal)
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