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Featured researches published by Simona Tripaldi.


Journal of Geophysical Research | 2012

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey

Agata Siniscalchi; Simona Tripaldi; Marco Neri; Marianna Balasco; Gerardo Romano; Joel Ruch; Domenico Schiavone

This paper presents a magnetotelluric (MT) survey of the unstable eastern flank of Mt. Etna. We take thirty soundings along two profiles oriented in the N-S and NW-SE directions, and from these data recover two 2D resistivity models of the subsurface. Both models reveal three major layers in a resistive-conductive-resistive sequence, the deepest extending to 14 km bsl. The shallow layer corresponds to the volcanic cover, and the intermediate conductive layer corresponds to underlying sediments segmented by faults. These two electrical units are cut by E-W-striking faults. The third layer (basement) is interpreted as mainly pertinent to the Apennine-Maghrebian Chain associated with SW-NE-striking regional faults. The detailed shapes of the resistivity profiles clearly show that the NE Rift is shallow-rooted ( 0–1 km bsl), thus presumably fed by lateral dikes from the central volcano conduit. The NW-SE profile suggests by a series of listric faults reaching up to 3 km bsl, then becoming almost horizontal. Toward the SE, the resistive basement dramatically dips (from 3 km to 10 km bsl), in correspondence with the Timpe Fault System. Several high-conductivity zones close to the main faults suggest the presence of hydrothermal activity and fluid circulation that could enhance flank instability. Our results provide new findings about the geometry of the unstable Etna flank and its relation to faults and subsurface structures.


Geophysics | 2010

A method to determine the magnetotelluric static shift from DC resistivity measurements in practice

Simona Tripaldi; Agata Siniscalchi; Klaus Spitzer

Many efforts have been made to face magnetotelluric (MT) static shift. Impedance tensor analyses give insight to the presence of this feature and allow the determination of some parameters described by the MT distortion matrix. A quantitative determination of the full distortion matrix is, however, still difficult and needs additional measurements. In addition to MT, other electric and electromagnetic methods also are effected by static shift. Using direct current resistivity techniques, e.g., we can determine the static-shift factors in a simpler way because the sources can be controlled. Generally, because the distortion matrix has four entries, four additional quantities have to be determined to describe the static shift completely. They can be achieved, e.g., through measuring two orthogonal electric field components for two orthogonal source configurations. The source electrode spacing, however, has to be sufficiently large to resemble horizontal currents and match the MT plane-wave analog. The procedure at hand extracts the static-shift factors from multielectrode measurements after this condition is met. For the sake of simplicity and demonstration purposes, only inline measurements orthogonal to the strike direction of a 2D model are considered so that the vectorial problem reduces to a scalar one. This procedure is applied to a MT field data set in a regional 2D environment that shows only two additional quantities are necessary to determine the static shift.


Seg Technical Program Expanded Abstracts | 2010

Dynamics of internal and external origin revealed by a single-site magnetotelluric monitoring

Marianna Balasco; Alessandro Giocoli; Vincenzo Lapenna; Gerardo Romano; Luciano Telesca; Agata Siniscalchi; Simona Tripaldi

A continuously operating magnetotelluric (MT) system was installed in Agri Valley (Southern Italy) by the Institute of Methodologies for the Environmental Analysis (IMAA) for studying the temporal stability of the electric properties of the subsoil. In a previous work, Balasco et al. (2008) analysed 1-year-long dataset evidencing possible source effects. Such effects are deeply investigated in this work considering almost three years monitoring. Two different types of dynamics are revealed: i) a seasonal fluctuation at short sounding periods, and ii) a behaviour linked to the external geomagnetic activity index at high periods.


Journal of Volcanology and Geothermal Research | 2010

Insights into fluid circulation across the Pernicana Fault (Mt. Etna, Italy) and implications for flank instability

Agata Siniscalchi; Simona Tripaldi; Marco Neri; Salvatore Giammanco; S. Piscitelli; Marianna Balasco; Boris Behncke; C. Magrì; V. Naudet; E. Rizzo


Engineering Geology | 2016

Geoelectrical resistivity variations and lithological composition in coastal gypsum rocks: A case study from the Lesina Marina area (Apulia, southern Italy)

Vincenzo Festa; Simona Tripaldi; Agata Siniscalchi; Pasquale Acquafredda; Antonio Fiore; Daniela Mele; Gerardo Romano


Geophysical Journal International | 2014

On the sensitivity of long-term magnetotelluric monitoring in Southern Italy and source-dependent robust single station transfer function variability

Gerardo Romano; Marianna Balasco; Vincenzo Lapenna; Agata Siniscalchi; Luciano Telesca; Simona Tripaldi


Natural Hazards and Earth System Sciences | 2014

Magnetotelluric investigation in the High Agri Valley (southern Apennine, Italy)

M. Balasco; Alessandro Giocoli; S. Piscitelli; Gerardo Romano; Agata Siniscalchi; T. A. Stabile; Simona Tripaldi


Archive | 2014

Geophysical multidisciplinary investigation of the structure of the unstable sector of Mt. Etna volcano

Alessandro Bonforte; Ornella Cocina; Agata Siniscalchi; Graziella Barberi; Francesco Guglielmino; Gerardo Romano; Simona Sicali; Simona Tripaldi


Archive | 2014

Geophysical multidisciplinary investigation of the structure of an unstable flank: the NE sector of Mt. Etna.

Alessandro Bonforte; Ornella Cocina; Agata Siniscalchi; Graziella Barberi; Francesco Guglielmino; Gerardo Romano; Simona Sicali; Simona Tripaldi


Journal of Geophysical Research | 2012

Flank instability structure of Mt. Etna inferred by a magnetotelluric survey: MAGNETOTELLURIC STUDY OF THE E ETNA FLANK

Agata Siniscalchi; Simona Tripaldi; Marco Neri; Marianna Balasco; Gerardo Romano; Joel Ruch; Domenico Schiavone

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S. Piscitelli

National Research Council

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Francesco Guglielmino

National Institute of Geophysics and Volcanology

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