GNGTS 2013 - Atti del 32° Convegno Nazionale

The CFDDP project: preliminary results from the 506 m pilot hole drilling at the Bagnoli Plain, eastern sector of the Campi Flegrei caldera (southern Italy) A. Mormone 1 , G. Aiello 2 , D. Barra 1,2 , T. Caputo 1 , S. Carlino 1 , S. de Vita 1 , M.A. Di Vito 1 , R. Isaia 1 , M.J. Jurado 3 , A. Marturano 1 , F. Molisso 4 , M. Piochi 1 , M. Sacchi 4 , R. Somma 1 , A. Tramelli 1 , T. Wiersberg 5 , G. De Natale 1 , C. Troise 1 1 Istituto Nazionale di Geofisica e Vulcanologia, sezione di Napoli, Osservatorio Vesuviano, Napoli, Italy 2 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università Federico II, Napoli, Italy 3 Instituto de Ciencias de la Tierra Jaume Almera - CSIC, Barcelona, Spain 4 Istituto per l’Ambiente Marino Costiero-IAMC, Napoli, Italy 5 Deutsches GeoForschungsZentrum GFZ, Telegrafenberg, Germany Introduction. The Campi Flegrei caldera (Fig. 1) is one of the highest-risk volcanic areas on the Earth with more than 70 explosive eruptions that occurred in the past 14.9 ka (Smith et al. , 2011; Di Renzo et al. , 2011), the historical eruption in 1538 AD that followed tens of years of unrest, and alternating episodes of uplift and subsidence recorded since Roman Times (bradyseism: Parascandola, 1947; Del Gaudio et al. , 2010). The present state of the volcanic system is related to 7 m of net uplift and more than 16,000 earthquakes that took place between 1950 and 2013 in the Pozzuoli area (e.g., Del Gaudio et al. , 2010; D’Auria et al. , 2010), and huge gaseous emissions with about 1500 tonnes/day of CO 2 (Chiodini et al. , 2001). These phenomena are linked to a high-temperature, fluid-rich and saline geothermal system (e.g., Guglielminetti 1986; De Vivo et al. , 1989; Mormone et al. , 2011 and reference therein) supplied by magmatic fluids and heat (e.g., De Natale et al. , 1991; Todesco et al. , 2010; Troiano et al. , 2011). Fig. 1 – Map of the Campi Flegrei caldera with the eruptive vent locations for post 15 ka eruptions, and well location (modified from Smith et al. , 2011). 263 GNGTS 2013 S essione 1.3