GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 1.2 112 INTEGRATED GEOLOGICAL, GEOPHYSICAL AND VOLCANOLOGICAL STUDY HIGHLIGHT THE INTERACTION BETWEEN STRUCTURES AND HYDROTHERMAL FLUIDS IN THE SOLFATARA AREA (CAMPI FLEGREI) F.D.A. Tramparulo 1 , M.G. Di Giuseppe 1 , R. Isaia 1 , A. Troiano 1 , J. Natale 2 , S. Vitale 2 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli - Osservatorio Vesuviano, Napoli, Italy 2 Università degli Studi di Napoli Federico II, Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Napoli, Italy Introduction In this study we carried out a multidisciplinary study in order to define the structural setting of a key area of Campi Flegrei caldera (Fig. 1), including the Solfatara crater, and the fumarolic- hydrothermal area located on the outer E-SE flank of the Solfatara volcano. This caldera sector hosts several fumarole vents, thermal springs, and boiling mud pools, representing, to date, the most active sector of the Campi Flegrei caldera with a widespread fumarolic hydrothermal activity and a great number of earthquakes. Furthermore, the whole area is characterized by a dense fracture and fault network that allowed, in the past, the emplacement of lava domes and the formation of an extensive hydrothermal system involved in phreatic and small hydro- thermal explosions (Isaia et al., 2015; Montanaro et al., 2017). Geo-volcanological and struc- tural studies, of this sector of Campi Flegrei caldera, reveal the occurrence of a great number of faults, which depict a complex structural array, and localizing the main fumaroles and mud pools, such as Bocca Grande and Fangaia in Solfatara crater, Pisciarelli Fumarole Fields and Fig. 1 - Simplified geological map of the Campi Flegrei caldera (modified after Vitale et al., 2019).