GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.2 - POSTER GNGTS 2023 Preliminary Results of Magnetic and Thermal Investigation at Vulcano Island S. Scudero 1 , A. Pisciotta 2 , A. D'Alessandro 1 , S. Bongiovanni 3 , A. Figlioli 3 , R. Martorana 3 , S. Speciale 1 , G. Vitale 1 1 Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Nazionale Terremoti, Rome, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, Palermo, Italy 3 Università di Palermo, Dipartimento di Scienze della Terra e del Mare, Palermo, Italy Introduction From the end of June 2021, changes in the monitored parameters (temperature, gas emission, seismicity, ground deformation) clearly indicate the beginning of a phase of unrest at Vulcano Island (Aeolian Islands, Italy). The anomalies consist of high temperatures of the fumaroles, increase of gas emissions from fumaroles and soils (both CO 2 and SO 2 ), ground deformation, and increased seismicity (Aiuppa et al., 2022, Inguaggiato et al., 2022). In the last decades, this volcano experienced frequent crises: 1978-1980, 1988-1991, 1996, 2004-2007, 2009-2010 (Inguaggiato et al., 2022), while the last eruption occurred in 1888-1890. For its activity, Vulcano represents the source of many potentially interconnected hazards (Selva et al., 2020). The Vulcano island has been widely investigated to understand its volcanic evolution (Gioncada et al., 1998; Gioncada et al., 2003; De Astis; 2013; Nicotra et al., 2018), the dynamics affecting the plumbing and the hydrothermal systems (Alparone et al., 2010; Cannata et al., 2012; Totaro et al., 2022), and the structure of the active “La Fossa” cone (Barde-Cabusson et al., 2009; Revil et al., 2010). Many studies reveal a complex evolution in which the regional tectonic may play a major role. The occurrence volcanism in the southern Tyrrhenian is generally linked to large scale geodynamic processes, but, the volcanism in the southern sector of Aeolian Islands, where Volcano is located, would be also controlled by a regional-scale, lithospheric NNW–SSE trending right-lateral strike-slip fault system. Even though several evidences suggest its occurrence (Mazzuoli et al., 1995; Ventura et al., 1999, Barreca et al., 2014; Cintorrino et al., 2019), the field expression of this system is poorly constrained. Bruno and Castiello (2009) revealed some faults affecting the SW base of the active cone by means of high-resolution seismic investigations. To better understand these features and provide a possible link to the larger scale tectonic framework, a campaign of magnetic survey has been carried out in the south-western part of the cone (Fig. 1, left). Moreover, integrated magnetic and thermal surveys have been performed in the area called “Spiaggia di Levante”, well known for the activity of the fumaroles (Chiodini et al., 2005). Maps of the magnetic field and thermal images are useful to highlight features corresponding to faults, or geological discontinuity in general, at various scales.