GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.2 199 al. , 2017) - and the spatial distribution of the top of the basement as resulting from our models, we believe that these models, by constraining the top of the basement in the area, provide also constraints to the seismicity cutoff for the 2016-2017 sequence. These findings highlight the lithologic control exerted by the sedimentary cover on the extensional seismogenic layer which is mainly confined in the Meso-Cenozoic sequences across the entire area. Acknowledgments. We thank eni for providing the gravity anomaly data covering the area. The data integration was carried out using the MOVE 2017 © Midland Valley Exploration Ltd. References Bally, A. W., Burbi, L., Cooper, C., & Ghelardoni, R. (1986), Balanced cross-sections and seismic reflection profiles across the Central Apennines. Memorie della Società Geologica Italiana, 35, 257-310. Barchi, M. R., Landuzzi, A., Minelli, G., & Pialli, G. (2001). Outer northern Apennines. In anatomy of an orogen: The Apennines and adjacent Mediterranean Basins (pp. 215–253). Netherlands: Springer. Barchi, M. R. & Mirabella, F. (2009), The 1997-98 Umbria-Marche earthquake sequence: “Geological” vs. “seismological” faults. Tectonophysics, 476, 170-179. doi:10.1016/j.tecto.2008.09.013 Barchi, M. R. (2010), The Neogene-Quaternary evolution of the Northern Apennines: crustal structure, style of deformation and seismicity. Journal of the virtual explorer 36 (10), doi:10.3809/jvirtex.2010.00220 Fig. 3 - Combined gravity and magnetic anomaly on section 2. (a) Magnetic modeling. (b) Bouguer modeling. (c) Modelled blocks. The geological model after Porreca et al. (2018) is reported at the bottom of the figure. The star locates the projected Mw 6.5 30 October 2016 event. ρ and k for the modeled units are given in the Figure. CdN: Castelluccio di Norcia basin, AQS: Acquasanta thrust, MSt: Mount Sibillini thrust. ρ of the turbidites range from 2300 kg m -3 in the central part of the section, to 2400 kg m -3 east of the MSt to 2250 kg m -3 further east from 41 km to end of the section. Lower ρ (2480 kg m -3 ) for the carbonates are found between 8 and 20 km along section model and between the Norcia and CdN basins and from surface to ~0 km in depth. Black dashed line in (c) locates the Curie isotherm (600 °C).