GNGTS 2019 - Atti del 38° Convegno Nazionale

160 GNGTS 2019 S essione 1.2 one oriented WNW-ESE, transversal to the axis of the Calabrian chain, and the NNE-SSO parallel to the axis. The comparison with the recent instrumental seismicity relative to the years 1986 - 2017 (Fig. 3) highlights the major concentrations in good correspondence with the main regional tectonic structures identified. As for the cutting bands, the distribution of the hypocentres also defines two main distribution trends, one NNE-SSW and the other WNW- ESE. The more detailed analysis allowed by this unified representation highlights the existence of two types of situations. In fact, in several cases we note a correspondence which, at least on the regional scale used in this analysis, is to be considered more than satisfactory (e.g. Valle del Mesima, Nicotera-Gioiosa Ionica, etc.). In other cases one of the two elements to be correlated is missing. For example, tectonic structures that can be correlated with the epicentres are not identified on the eastern edge of the Serre. Conclusions. Within a geodynamically active area a multidisciplinary approach is of fundamental importance for the study of active faults and seismicity of the territory. A multidisciplinary approach infact allows to consider in a unified context the various factors that contribute to the identification of active and capable tectonic structures that generate earthquakes in on-land and off-shore areas. The approach used in this study took into consideration aspects of a historical, seismological and geological nature. At present there is a preliminary phase in which, as an experiment, we tried to understand the goodness of the method applied within an area characterized by extremely complex geology and strong seismicity in the past centuries. In this study the attention was focused on regional tectonic structures.Agood correlation was found between them and recorded seismicity, both spatially and geometrically and in kinematic terms. Anyway, cases of mismatch must be given a positive meaning, if we consider, as in reality they are, useful indications of problems that have not yet emerged, and / or situations that are still not entirely clear, which it is necessary to study in depth. This approach can be adopted more generally, in order to obtain more detail and therefore to broaden the field of study to tectonic structures and territorial contexts at various scales in order to obtain a precise localization of both active and capable tectonic structures at regional and detailed scale, providing a reference tool in all possible applications. Bibliografia Bonardi G., Cavazza W., Perrone V. and Rossi S.; 2001: Calabria - Peloritani terraine and northern Ionian Sea. In: Vai G. B. & Martini I.P. (Eds.), Anatomy of an orogen: the Appennines and adjacent Mediterranean Basins. Kluver Academic Publishers, Dordrecht/ Boston/ London, pp. 287-306. Boschi E., Ferrari G., Gasperini P., Guidoboni E., Smriglio G. and Valensise G.; 1995: Catalogo dei forti terremoti in Italia dal 461 a.C. al 1980 – ING – SGA. Cfr. anche http://storing.ingv.it/cfti4med/ Brutto F., Muto F., Loreto M. F., De Paola N., Tripodi V., Critelli S., and Facchin, L.;2016: The Neogene-quaternary geodynamic evolution of the central CalabrianArc: A case study from the western Catanzaro trough basin. Journal of Geodynamics, 102, 95–114. Critelli, S. ; 1999: The interplay of lithospheric flexure and thrust accomodation in forming stratigraphic sequences in the southern Apennines foreland basin system, Italy. Accademia Nazionale dei Lincei. Rendiconti Lincei Sci. Fis. Nat. 10, 257-326. Critelli, S., Muto, F., Perri, F., and Tripodi, V.; 2017: Interpreting provenance relations from sandstone detrital modes, southern Italy foreland region: Stratigraphic record of the Miocene tectonic evolution. Marine and Petroleum Geology doi:10.1016/j.marpetgeo.2017.01.026. Dumas, B. and Raffy, J.; 2004: Late Pleistocene tectonic activity deduced from uplifted marine terraces in Calabria, facing the Strait of Messina. Quat. Nova 8, 79–99. Faccenna, C., Funiciello, F., Giardini, D. and Lucente, P.; 2001: Episodic back-arc extension during restricted mantle convection in the Central Mediterranean. Earth Planetary Science Letters, 187, pp. 105-116. Galli, P. and Bosi, V.; 2002: Paleoseismology along the Cittanova fault: implications for seismotectonics and earthquake recurrence in Calabria (southern Italy). J. Geophys. Res. 107 (B3), 2044 Ghisetti, F. and Vezzani, L.; 1981: Contribution of structural analysis to understanding the geodynamic evolution of the Calabrian Arc (southern Italy). J. Struct. Geol. 3, 371–381. Minelli, L. and Faccenna, C.; 2010: Evolution of the Calabrian accretionary wedge (central Mediterranean). Tectonics 29, http:// dx.doi.org/10.1029/2009tc002562 (TC4004). Earthquake phenomena (first paper). Bull. Earthq. Res. Inst., 40, 815-829.