GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 1.2 143 De Guidi, G., Barberi, G., Barreca, G., Bruno, V., Cultrera, F., Grassi, S., Imposa, S., Mattia, M., Monaco, C., Scarfì, L., Scudero, S., 2015. Active thrusting and folding south of Mt. Etna (eastern Sicily). Rend. Online Soc. Geol. Ital. 29, 35–38. doi:10.1016/j.jog.2015.06.001 Dipartimento della Protezione Civile. (2008). Emergenza “Maccalube” dell’11 Agosto 2008 nel Comune di Caltanis- setta; Descrizione dell’evento e dei danni. Caltanissetta. Imposa, S., Grassi, S., De Guidi, G., Battaglia, F., Lanaia, G., Scudero, S., 2016. 3D Subsoil Model of the San Biagio “Salinelle” Mud Volcanoes (Belpasso, Sicily) derived from Geophysical Surveys. Surv. Geophys. 37. doi:10.1007/s10712-016-9380-4 Lavecchia, G., Ferrarini, F., de Nardis, R., Visini, F., Barbano, M.S., 2007. Active thrusting as a possible seismogenic source in Sicily (Southern Italy): Some insights from integrated structural-kinematic and seismological data. Tectonophysics 445, 145–167. doi:10.1016/j.tecto.2007.07.007 Lentini, F., Carbone, S., 2006. Tettonica- Geologia della Sicilia. Mem. Descr. della Cart. Geol. d’italia - Vol. 95 351–374. Madonia, P., Grassa, F., Cangemi, M., Musumeci, C., 2011. Geomorphological and geochemical characterization of the 11 August 2008 mud volcano eruption at S. Barbara village (Sicily, Italy) and its possible relationship with seismic activity. Nat. Hazards Earth Syst. Sci. 11, 1545–1557. doi:10.5194/nhess-11-1545-2011 Possible unslipped segments in the M. Vettore Fault System G. De Guidi 1,2 , A. Vecchio 1 , G. Barreca 1 , F. Brighenti 1 , R. Caputo 3,4,5 , F. Carnemolla 1 , A. Di Pietro 1 , M. Lupo 1 , M. Maggini 3,5 , S. Marchese 1 , D. Messina 1 , C. Monaco 1,2 , S. Naso 1 1 Department of Biological, Geological and Environmental Sciences, University of Catania, Italy 2 CRUST, UR-UniCT, Catania, Italy 3 Department of Physics and Earth Sciences, University of Ferrara, Italy 4 Research and Teaching Center for Earthquake Geology, Tyrnavos, Greece 5 CRUST, UR-UniFE, Ferrara, Italy Introduction. On October 30, 2016, in Central Italy, immediately north of the epicentral area of the August 24 event a strong eartquake (Mw = 6.5) reactivated the northern sector of the Monte Vettore Fault System (MVFS). Our local geodetic network was fully affected by the new event and therefore we performed a second campaign soon after (November 11-13, 2016) (Fig. 1 and Tab. 1) (De Guidi et al. , in press). The measured deformation (with 95% confidence errors) was characterised by both horizontal and vertical movements. In particular, the east benchmark VTE1 documents 312 mm of eastward horizontal displacement and 29 mm of upward motion, while the VTE2 282 mm of eastward horizontal displacement and 67 mm of upward component of motion. On the contrary, all three western benchmarks recorded westward horizontal displacements (419, 288 and 26mm) and subsidence (707, 288 and 769 mm) for stations VTW5, VTW4 and VTW3, respectively. Similar to Wilkinson et al. (2017) and the results of the DInSAR technique (http://www.irea . cnr.it/index.php?option=com_k2&view=item&id=761: nuovi-risultati-sul-terremoto-del-30- ottobre-2016-ottenuti-dai-radar-dei-satelliti-sentinel-1), we documented ca. 730 mm of ENE- WSW lengthening on a distance of 7 km in correspondence of the northern sector of the Mt. Vettore Fault Segment, while the off-fault vertical displacement between footwall and hanging- wall blocks was 736 mm, confirming the overall consistency of the different approaches and datasets (Fig. 2).