GNGTS 2016 - Atti del 35° Convegno Nazionale

220 GNGTS 2016 S essione 1.2 two data sets is zero within one standard deviation, and the rms is consistent with the 25 deg nominal uncertainty of the geophysical data. Tab. 1 – Analysis of angle gap between minimum horizontal stresses from borehole (A-D quality) or focal mechanisms measurements (Montone and Mariucci, 2016) and geodetically inferred stress directions. For each investigated tectonic area we give: number of geophysical data, and weigheted mean and rms of the difference between geodetic and geophysical Sh min . BOREHOLE BREAKOUTS FOCAL MECHANISMS TECTONIC # <Res Sh min > Rms # <Res Sh min > Rms REGION (deg) (deg) (deg) (deg) N. Sicily 0 - - 23 -13.9 40.2 Friuli 0 - - 15 10.6 18.7 Emilia 16 23.7 6.4 20 6.9 23.4 C. Apennines 3 43.46 23.5 92 -1.8 21.5 S. Apennines 25 8.41 2.2 21 -9.4 32.6 Gargano 2 -53.7 33.8 15 -32.3 43.8 This agreement is slightly worse for the other regions, and this discrepancy appears to be strongly correlated with the number of available data. For Sicily it is also worth noting that the coverage of GPS sites is modes in the northernmost part of the compressional area. In conclusion, the two independent approaches based on geophysical and geodetic data seem to be in a reasonable agreement, especially in those areas where the quantity and quality of the data give a strong statistical basis to their comparison. References Bruyninx, C., Altamimi, Z., Caporali, A., Kenyeres, A., Stangl, G., Torres, J.A., 2013. Guidelines for EUREF Densifications, vers.5 available online at ftp://epncb.oma.be/pub/ general/Guidelines_for_EUREF_Densifications. pdf. Caporali, A., Braitenberg, C., Montone, P., Rossi, G. , Valensise, G., Viganò, A., Zurutuza, J., 2016. � ������������ A quantitative approach to the loading rate of seismogenic sources in Italy. Proc. GNGTS2016 (This volume). Heidbach, O., Tingay, M., Barth, A., Reinecker, J., Kurfeß, D. & Muller, B., 2010. Global crustal stress pattern based on the World Stress Map database release 2008, Tectonophysics, 482, 3–15. Meletti, C., F. Galadini, G. Valensise, M. Stucchi, R. Basili, S. Barba, G. Vannucci, and E. Boschi 2008. � ������� A seismic source zone model for the seismic hazard assessment of the Italian territory, Tectonophysics 450, no. 1, 85–108, doi 10.1016/j.tecto.2008.01.003. Montone, P. and M.T. Mariucci 2016. The new release of the Italian contemporary stress map, Geophys. J. Int. (2016) 205, 1525–1531, doi: 10.1093/gji/ggw100. Pierdominici, S. and O. Heidbach, 2012. ������ ����� �� ����� � ���� ����������������� �� ��������� ������ ��� ����� Stress eld of Italy - mean stressorientation at different depths and wave- length of the stress pattern, Tectonophysics, 532, 301–311.