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Authors: Carapezza, M. L.* 
Gattuso, A.* 
Pagliuca, N. M.* 
Ranaldi, M.* 
Sortino, F.* 
Tarchini, L.* 
Zanolin, F.* 
Badiali, L.* 
Console, R.* 
Frepoli, A.* 
Lisi, A.* 
Marchetti, A.* 
Mele, G.* 
Title: Environmental pre-exploitation monitoring of Torre Alfina geothermal system (Central Italy)
Issue Date: Jun-2015
Keywords: Torre Alfina geothermal system
pre-exploitation monitoring
geothermal pilot plant
induced seismicity
Subject Classification05. General::05.02. Data dissemination::05.02.02. Seismological data 
Abstract: An interesting project of geothermal pilot plant, with no-gas emission in atmosphere, has been submitted for approval in the medium-enthalpy geothermal field of Torre Alfina. This prompted us to develop a geochemical and geophysical monitoring of the area with the aim of establishing a background information to reco-gnize anomalous gas emission, induced seismicity and subsidence, possibly related to the field exploitation. The exploration conducted by Enel in the years ‘70 - '80, including the drilling of 9 deep wells, has shown the existence of a medium-enthalpy geothermal field in the Torre Alfina zone, in central Italy. The area has been affected by a very complex geological evolution during the Neogene. It was affected by the Quaternary volcanism of the Tyrrhenian margin which, reached its climax between 0.6 and 0.3 Ma. The present stress field around Quaternary volcanoes of central Italy has a NE to ENE direction of extension, in agreement with the alignment of Quaternary volcanoes and earthquake fault plane solutions, with T axes preferentially oriented between NE and ENE.
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