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Authors: Siniscalchi, A.*
Tripaldi, S.*
Neri, M.*
Giammanco, S.*
Piscitelli, S.*
Balasco, M.*
Behncke, B.*
Magri, C.*
Naudet, V.*
Rizzo, E.*
Title: Insights into fluid circulation across the Pernicana Fault (Mt. Etna, Italy) and implications for flank instability
Title of journal: Journal of Volcanology and Geothermal Research
Series/Report no.: /193 (2010)
Publisher: Elsevier B.V.
Issue Date: 1-Apr-2010
DOI: 10.1016/j.jvolgeores.2010.03.013
Keywords: Pernicana Fault
fluid circulation
structural geology
electrical methods
Abstract: We conducted geophysical–geochemical measurements on a ∼2 kmN–S profile cutting across the Pernicana Fault, one of the most active tectonic features on the NE flank of Mt. Etna. The profile passes from the unstable E flank of the volcano (to the south) to the stable N flank and significant fluctuations in electrical resistivity, self-potential, and soil gas emissions (CO2, Rn and Th) are found. The detailed multidisciplinary analysis reveals a complex interplay between the structural setting, uprising hydrothermal fluids, meteoric fluids percolating downwards, ground permeability, and surface topography. In particular, the recovered fluid circulation model highlights that the southern sector is heavily fractured and faulted, allowing the formation of convective hydrothermal cells. Although the existence of a hydrothermal system in a volcanic area does not surprise, these results have great implications in terms of flank dynamics at Mt. Etna. Indeed, the hydrothermal activity, interacting with the Pernicana Fault activity, could enhance the flank instability. Our approach should be further extended along the full extent of the boundary between the stable and unstable sectors of Etna for a better evaluation of the geohazard in this active tectonic area.
Appears in Collections:Papers Published / Papers in press
04.02.99. General or miscellaneous
04.02.01. Geochemical exploration
04.02.04. Magnetic and electrical methods
04.02.05. Downhole, radioactivity, remote sensing, and other methods
04.02.07. Instruments and techniques
04.04.99. General or miscellaneous
04.04.06. Rheology, friction, and structure of fault zones
04.04.07. Rock geochemistry
04.04.09. Structural geology
04.04.11. Instruments and techniques
04.04.12. Fluid Geochemistry
04.07.99. General or miscellaneous
04.07.07. Tectonics
04.08.99. General or miscellaneous
04.08.01. Gases
04.08.02. Experimental volcanism
04.08.04. Thermodynamics
04.08.06. Volcano monitoring
04.08.07. Instruments and techniques
04.08.08. Volcanic risk
05.08.99. General or miscellaneous

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