Application of gravity and deep dipole geoelectrics in the volcanic area of Mt. Etna (Sicily)

A multidisciplinary study of the volcanoclastic deposit named “Chiancone”, inland and offshore, in the frame of the evolution of volcanism in the Etna area

“…4). In accordance with our results, Loddo et al (1989) using deep dipole measurements found a rise in the non-eruptive substratum in the same area along the coast.…”

Volcanic structure of the southern sector of Mt. Etna after the 2001 and 2002 eruptions defined by magnetotelluric measurements

“…Geoelectric data along a transect corresponding to ours (Loddo et al 1989) had shown that the volcanics have an estimated thickness of about 1 km or even less; therefore, the main anomaly to the west and the deep anomaly to the east are located in the sedimentary basement. Moreover, a decrease of resistivity was defined by Loddo et al (1989), down to values of a few hundred Ohm-m, having a thickness of a few hundred metres at the centre and almost 1 km on both Fig. 4 Single-site (top) and remote-reference data (bottom) collected with NIMS systems along the main profile.…”

“…The electrical properties of Etnean rocks were also investigated by impedance spectroscopy of representative lava flow samples (Scarlato et al 2004). Loddo et al (1989), using deep dipole geoelectrics, distinguished the geometry of the volcanics and defined the distribution of the resistivity values of the basement. They found the basement to be highly non-homogeneous down to an average depth of 2 km b.s.l., whereas the underlying portion appears much more homogeneous and resistive (>1,000 Ohm-m).…”

“…Etna has been outlined using dipole geoelectric, magnetotelluric and self-potential methods (Loddo et al 1989;Di Maio et al 1998 and references therein; Mauriello et al 2004 and references therein; Della Monica et al 2004). The electrical properties of Etnean rocks were also investigated by impedance spectroscopy of representative lava flow samples (Scarlato et al 2004).…”

Evolution of volcanism around the eastern sector of Mt. Etna, inland and offshore, in the structural framework of eastern Sicily

“…soundings (Loddo et al, 1989) (Fig.4C), show the existence of a lower level of resistivity whichM a n u s c r i p t varies between 2000 Ώm (sounding 26) and 5500 Ώm (sounding 5). This level corresponds to 172 massive Flysch terrains embedded with quarzite and limestone (Loddo et al, 1989). These 173 resistivity values are lower than those found in sounding 4, where a resistivity value of 40000 Ώm 174 was found for the same sedimentary formation.…”