GNGTS 2022 - Atti del 40° Convegno Nazionale

112 GNGTS 2022 Sessione 1.2 FIRST STEPS TOWARDS THE UPPER CRUSTAL STRUCTURE INVESTIGATION IN THE AREA OF MEFITE D’ANSANTO (ITALY) BY USING TELESEISMIC EVENTS G. Milano 1 , A. Gervasi 2 , S. Morabito 1 , P. Cusano 1 , P. Del Gaudio 2 , D. Galluzzo 1 , G. Gaudiosi 1 , M. La Rocca 3 , L. Nardone 1 , S. Petrosino 1 , L. Zuccarello 4 1 INGV- Sezione di Napoli ‘Osservatorio Vesuviano’, Naples, Italy 2 INGV- Osservatorio Nazionale Terremoti, Rende (CS), Italy 3 University of Calabria, Rende (CS), Italy 4 INGV- Sezione di Pisa, Pisa, Italy Further. “The role of FlUids in the pReparaTory pHase of EaRthquakes in Southern Apennines”, is an INGV Department Strategic Project devoted to defining the role of fluids in earthquake genesis (https://progetti.ingv.it/it/progetti-dipartimentali/terremoti/further ). One of the target areas of the multidisciplinary study is Mefite d’Ansanto, which is the largest area of non-volcanic low temperature CO 2 emission field on the Earth (Fig. 1). In particular, the Work Package 1.4 is dedicated to the application of methodologies in time and frequency domains, aimed to intercept eventual variations in fluid behavior before or in correspondence of local and regional earthquakes, using recordings from the INGV National Seismic Network and local networks. For this purpose, temporary acquisition surveys have been locally deployed (Cusano et al. , 2021). In order to define how large and deep the area of diffuse CO 2 degassing is, we investigate the upper crustal structure utilizing teleseismic events. As well known in literature, among the techniques applied to investigate the crustal structure of an area, the analysis of teleseismic events provides information about the depth and dip of the principal crustal discontinuities. The methods are based on the identification of P-to-P and S-to-P converted phases generated by the interaction of an incident P or S wave with velocity discontinuities beneath the Fig. 1 - Map showing the Mefite d’Ansanto area (up-left) and the location of MEFA (yellow triangle) and RSF3 (blue triangle) stations (Map retrieved from GoogleEarthPro in 2022). In the up-right corner the Mefite position on the Italian territory is reported.