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http://hdl.handle.net/2122/6035
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 | 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 | URL: | http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235962%232010%23998069998%231977700%23FLA%23&_cdi=5962&_pubType=J&_auth=y&_acct=C000067082&_version=1&_urlVersion=0&_userid=5381242&md5=fcd41a57ae4a50f631de6ce2810a433a | Keywords: | Pernicana Fault fluid circulation structural geology Etna magnetic electrical methods |
Subject Classification: | 04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods 04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones 04. Solid Earth::04.04. Geology::04.04.07. Rock geochemistry 04. Solid Earth::04.04. Geology::04.04.09. Structural geology 04. Solid Earth::04.04. Geology::04.04.11. Instruments and techniques 04. Solid Earth::04.04. Geology::04.04.12. Fluid Geochemistry 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 04. Solid Earth::04.08. Volcanology::04.08.01. Gases 04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism 04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 05. General::05.08. Risk::05.08.99. General or miscellaneous |
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. |
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