GNGTS 2019 - Atti del 38° Convegno Nazionale

740 GNGTS 2019 S essione 3.3 Conclusions. The numerical simulation of CO 2 rising along the main Colle Sponeta fault has allowed to obtain useful information on the geometry of the source and the flow values within the investigated underground volume. In particular, the numerical simulations allowed to obtain CO 2 flow estimates comparable with those actually measured on site. This result encourages a second phase study related to the simulation of different CO 2 degassing scenarios for the evaluation of possible variations in the amount of CO 2 emitted near the fault, which is important for the estimation of gas hazard. References Ascione A., Ciotoli G., Bigi S., Buscher J., Mazzoli S., Ruggiero L., Sciarra A., Tartarello M.C. and Valente E.; 2018: Assessing mantle versus crustal sources for non-volcanic degassing along fault zones in the actively extending southern Apennines mountain belt (Italy) . Geological Society of America Bulletin, 130(9/10) , 1697-1722. Chiodini G., Frondini F., Kerrick D.M. and Rogie J.D.; 2000: Flux measurements of non-volcanic CO 2 emission from some vents in central Italy . Journal of Geophysical Research, Solid Earth, 105 , 8435-8445. De Paola C., Di Maio R., Piegari E. (2019). ERT and SP measurements for the characterization of fault-controlled soil CO 2 degassing . 25st European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2019, The Hague (The Netherlands), 8-12 September 2019, EarthDoc, Tu_25th_A03, 5 pp., doi: 10.3997/2214- 4609.201902390. Frondini F., Cardellini C., Caliro S., Beddini G., Rosiello A. and Chiodini G.; 2018: Measuring and interpreting CO 2 fluxes at regional scale: the case of Apennines, Italy . Journal of the Geological Society, 176 , 408-416. Kerrick D.M. and Seward T.M.; 1996: Hydrothermal CO 2 emission from the Taupo Volcanic Zone, New Zealand . Earth and Planetary Science Letters, 139(1) , 105-113. Fig. 3 - CO 2 flux distribution (vectors) and gas saturation (isosurfaces) in the investigated volume. ARRIVAL-ANGLE EFFECTS ON TWO-RECEIVER MEASUREMENTS OF PHASE VELOCITY F. Magrini 1 , G. Diaferia 1 , L. Boschi 2,3,4 , F. Cammarano 1 1 Department of Sciences, Università degli Studi Roma Tre, Italy 2 Dipartimento di Geoscienze, Università degli Studi di Padova, Italy 3 Sorbonne Université, CNSR, INSU, Institut des Sciences de la Terre de Paris, ISTeP UMR 7193, Paris, France 4 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy Introduction. Surface-wave phase velocities from teleseismic events and ambient noise interferometry (AN) (e.g. Shapiro et al. , 2005; Boschi and Weemstra, 2015) have proven fundamental in imaging the Earth at different scales. Whereas seismic noise is dominated by relatively high frequencies and therefore provides information on shallow structures, data