GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.1 113 a structural point of view, the attributes provide a great match between the known location of the seismogenic faults at surface (gray arrows), and their geophysical signature in depth (red arrows). In fact, both the “Energy Gradient” and “Pseudo Relief” attributes are particular effective in enhancing their display, like in the case of the antithetic fault of the Norcia Basin (NOR01): it appears E-dipping and steeper close to the surface, delineating, together with the enhanced West-dipping fault tracks, the deep geometry of the basin (Nb in Fig. 2b). Similar results have been obtained using the aforementioned attributes on the NOR02 profile, but in this case the fault zones that characterize the Castelluccio di Norcia basin (CNb) appear much more complex, displaying an overall “V shape”, formed by multiple, minor discontinuities that generate high fragmentation of the reflectors (Fig. 3b). Moreover, the seismic attributes strongly emphasize the reflectors continuity/discontinuity, better showing reflection patterns, aiding an easier interpretation of the geometries. In conclusion, we tested the use of some seismic attributes on 2D industrial seismic lines for seismotectonical purposes. Our results indicate that this approach gives the opportunity to extract additional information from vintage seismic lines characterized by poor overall quality. The new seismic images, in fact, may play an important role for the geoscientists to better constrain the deep geological setting and the fault patterns, even in complex and seismically active areas. Acknowledgments. We are grateful to Eni S.p.A for providing seismic sections, and to dGB for providing the academic version of OpenDtect software. References Barchi M. R. and Mirabella F.; 2009: The 1997-98 Umbria-Marche earthquake sequence: “Geological” vs. “seismological” faults. Tectonophysics, 476 (1–2), 170–179. <https://doi.org/10.1016/j.tecto.2008.09.013 > Chiaraluce L., Di Stefano R., Tinti E., Scognamiglio L., Michele M., Casarotti E., Cattaneo M., De Gori P., Chiarabba C., Monachesi G., Lombardi A., Valoroso L., Latorre D. and Marzorati, S.; 2017: The 2016 Central Italy Seismic Sequence: A First Look at the Mainshocks, Aftershocks, and Source Models . Seismol. Res. Lett., 88 , 757–771, doi:10.1785/0220160221. Chopra S. and Marfurt K.J.; 2008: Emerging and future trends in seismic attributes . Lead. Edge, 27 , 298, doi:10.1190/1.2896620. Ercoli M., Pauselli C., Federico C., Frigeri A. and Forte E.; 2012: 3D GPR imaging for paleoseismology in Central Appennines (Italy) , in: 2012 14th International Conference on Ground Penetrating Radar (GPR). IEEE, pp. 937– 942, doi:10.1109/ICGPR.2012.6254997. Ercoli M., Pauselli C., Cinti F.R., Forte E. and Volpe R.; 2015: Imaging of an active fault: Comparison between 3D GPR data and outcrops at the Castrovillari fault (Calabria, Italy). Interpret. - Spec. Sect. Geophys. imaging Interpret. outcrops, 3 , 57–66, doi :http://dx.doi.org/10.1190/INT-2014-0234.1 Ercoli M., Carbonell R., Porreca M., Minelli G., Pauselli C. and Barchi M.R.; 2018: First results of a reprocessing workflow on a 2D vintage reflection seismic profile across the area struck by the 2016 Mw 6.5 Norcia earthquake (Central Italy) . 36th General Assembly of the European Seismological Commission (EPSC2018), 2-7 September 2018, Valletta – Malta. Forte E., Pipan M., Casabianca D., Di Cuia R. and Riva A.; 2012: Imaging and characterization of a carbonate hydrocarbon reservoir analogue using GPR attributes . Journal of Applied Geophysics, 81 , 76–87. Mazzotti A., Stucchi E., Fradelizio G., Zanzi L. and Scandone P.; 2000: Seismic exploration in complex terrains: A processing experience in the southern Apennines. Geophysics, 65 (5), 1402–1417. https://doi. org/10.1190/1.1444830. Mirabella F., Barchi M.R., Lupattelli A., Stucchi E. and Ciaccio M.G.; 2008: Insights on the seismogenic layer thickness from the upper crust structure of the Umbria-Marche Apennines (Central Italy) . Tectonics, 0278-7407, 27 , TC1010. Porreca M., Minelli G., Ercoli M., Brobia A., Mancinelli P., Cruciani F., et al.; 2018: Seismic reflection profiles and subsurface geology of the area interested by the 2016–2017 earthquake sequence (Central Italy) . Tectonics, 37 . https://doi.org/10.1002/2017TC004915.