APPLICATION DU SONDAGE MAGNETIQUE DIFFERENTIEL A L'ETUDE DE LA ZONE GEOTHERMIQUE DE TRAVALE-RADICONDOLI (TOSCANE)
In 1980 and in 1982, the Laboratory of Applied Geophysics of the C.N.R.S. attempted to establish by magnetic differential sounding a possible anomaly of conductivity, linked with the geothermal field of Travale-Radicondoli (Tuscany). Some 25 sites have been occupied along two profiles, one being located between Siena and Populonia, near Piombino, the other one between Siena and Cecina. An important anomaly of the transient magnetic field (some 15% of the normal field) was brought to light in 1980 between Gerfalco (in the S.W.) and Frosini (in the N.E.). It exactly covers the geothermal area of Travale. The direction of the telluric currents causing the anomaly is parallel to the magnetic meridian and their maximum depth is of some 2000 metres. The 1982 campaign has shown that in the North of Travale, anomalous currents move in the N.W.- S.W. direction or even completely E.W. (in the S.W. of Volterra), and meet in the sea, round Livorno. One can give an interpretation of the phenomena as a whole, if one admits the presence of very conductive layers between Lardello and Travale. The currents which circulate parallel to the coast are channelled locally by this structure which could be closely linked up with the vapour field.
Références bibliographiques: EUR 9326 FR (1984) MF, 126 P., BFR 240, EUROFFICE, LUXEMBOURG, POB 1003
Disponibilité: Can be ordered online
Numéro d'enregistrement: 1989123100600 / Dernière mise à jour le: 1987-01-01
Langues disponibles: fr