GNGTS 2017 - 36° Convegno Nazionale

112 GNGTS 2017 S essione 1.2 NW-SE trending faults (i.e VMFZ, PVFZ and TNFZ) show en-echelon configuration and form pull-apart (e.g. along the Lipari-Vulcano complex) and dilatational stepovers (e.g. the Tindari- Barcellona depression) in the overlapping sectors. This faults configuration and their current activity is clearly depicted by earthquakes clustering in the area whilst right-lateral kinematics on the NW-SE major faults and normal on the NE-SW trending structures is strongly supported by computed focal solutions and geodetic data (Fig. 3A). Our interpretation shows that the active deformation pattern of the study area is currently expressedbyNW-SE trending, right-transtensional én-echelon fault segmentswhose overlapping gives rise to releasing stepover and pull-apart structures. This structural architecture has favored magma and fluid ascent and the shaping of the Lipari-Vulcano volcanic complex. Similarly, the Gulf of Patti is interpreted as an extensional relay zone between two overlapping, right-lateral NW-SE trending master faults. Notably, most of the low-magnitude instrumental seismicity occurs within the relay zones, whilst the largest historical earthquakes (1786, Mw=6.2; 1978, Mw=6.1) are located along the major fault segments (Fig. 3B). Finally, our investigations confirm that ATLFS is a prominent fault belt playing a primary role in the seimotectonic of the southern margin of the Calabrian Arc where it accommodates deformation between two main lithospheric domains characterized by different stress regimes. References Barreca, G., V. Bruno, F. Cultrera, M. Mattia, C. Monaco and L. Scarfì (2014). New insights in the geodynamics of the Lipari-Vulcano area (Aeolian Archipelago, southern Italy) from geological, geodetic and seismological data, Journal of Geodynamics, 82, 150-167; http://dx.doi.org/10.1016/j.jog.2014.07.003. Billi A., Barberi G., Faccenna C., Neri G., Pepe F. & Sulli F. (2006) - Tectonics and seismicity of the Tindari Fault System, southern Italy: Crustal deformations at the transition between ongoing contractional and extensional domains located above the edge of a subducting slab. Tectonics, 25, TC2006, doi:10.1029/2004TC001763. Gasparini, C., Iannacone, G., Scandone, P., Scarpa, R., 1982. Seismotectonics of the Calabrian Arc. Tectonophysics 82, 267–286. Palano M., Ferranti L., Monaco C., Mattia M., Aloisi M., Bruno V., Cannavò F., Siligato G. (2012) – GPS velocity and strain fields in Sicily and southern Calabria, Italy: Updated geodetic constraints on tectonic block interaction in the central Mediterranean. Journal of Geophysical Research, vol. 117, b07401, doi:10.1029/2012jb009254. Scarfì L., Barberi G., Musumeci C. Patanè D. (2016) - Seismotectonics of Northeastern Sicily and Southern Calabria (Italy): New constraints on the tectonic structures featuring in a crucial sector for the Central Mediterranean geodynamics . Tectonics, 35 , 812–832, doi:10.1002/2015TC004022. Rovida, A., Camassi, R., Gasperini, P., Stucchi, M., (2011): CPTI11, the 2011 version of the Parametric Catalogue of Italian Earthquakes. INGV, Milano, Bologna, http://emidius.mi.ingv.it/CPTI , DOI:10.6092/INGV. IT-CPTI11. From field to geophysical data: an example of ongoing fold growth from the Greater Caucasus, Republic of Georgia F.L. Bonali 1 , A. Tibaldi 1 , F. Pasquaré Mariotto 3 , E. Russo 1 , V. Alania 2 , A. Chabukiani 2 , O. Enukidze 2 , N. Tsereteli 2 1 Department of Earth and Environmental Sciences, University of Bicocca, Milan, Italy 2 M. Nodia Institute of Geophysics, M. Javakhishvili State University, Tbilisi, Georgia 3 Department of Theoretical and Applied Sciences, Insubria University, Varese, Italy Introduction. Ongoing deformation processes that combine fault propagation and folding are the cause of diffuse seismicity inmany areas of theworld aswell as in theRepublic ofGeorgia (Fig. 1A). In terms of seismic hazard assessment, a deeper understanding of the structural evolution of tectonically active folds and of their evidence at the surface, are of paramount importance. In this study, we present a multidisciplinary analysis of the active Tsaishi anticline fold (TF) (Fig. 1C), resulting in the development of a 3D model that integrates: i) field geomorphological