GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 1.1 33 Hardebeck J. L. and Okada T.; 2018:  Temporal stress changes caused by earthquakes: A review . J. Geophys. Res. Solid Earth, 123 , 1350–1365, doi.org/10.1002/2017JB014617. Heidbach O., Tingay M., Barth A., Reinecker J., Kurfeß D. and Müller B.; 2010: Global crustal stress pattern based on the World Stress Map database release 2008, Tectonophysics, 482 , 3-15, doi: 10.1016/j.tecto.2009.07.023. King G.C.P., Stein R.S. and Lin J.; 1994: Static stress changes and the triggering of earthquakes . Bull. Seism. Soc. Am., 84 , 935-953. King G. and Cocco M.; 2000: Fault interaction by elastic stress changes: new clues from earthquake sequences. Adv. Geophys ., 44 , 1–36. Mastrolembo B. and Caporali A.; 2017: Stress and strain-rate fields: A comparative analysis for the Italian territory . Bollettino di Geofisica Teorica ed Applicata, 58 , 265-284. Montone P. and Mariucci M. T.; 2016: The new release of the Italian contemporary stress map, Geophysical Journal International, 205 , 1525-1531, doi: 10.1093/gji/ggw100. Okada Y.; 1992:  Internal deformation due to shear and tensile faults in a half-space. Bull. Seismol. Soc. Amer., 82 (2), 1018-1040. Rovida A., Locati M., Camassi R., Lolli B. and Gasperini, P. (eds); 2016: CPTI15, the 2015 version of the Parametric Catalogue of Italian Earthquakes . Istituto Nazionale di Geofisica e Vulcanologia, doi.org/10.6092/INGV.IT- CPTI15. Toda S., Stein R.S., Reasenberg P.A. and Dieterich J.H.; 1998: Stress transferred by the Mw=6.5 Kobe, Japan, shock: Effect on aftershocks and future earthquake probabilities , J. Geophys. Res., 103 , 24543-24565. Wedmore L. N. J., Faure Walker J. P., Roberts G. P., Sammonds P. R., McCaffrey K. J. W. and Cowie, P. A.; 2017: A 667 year record of coseismic and interseismic Coulomb stress changes in central Italy reveals the role of fault interaction in controlling irregular earthquake recurrence intervals, J. Geophys. Res. Solid Earth, 122 , 5691- 5711, doi:10.1002/2017JB014054. THE SEISMICITY OF THE CAMPOTOSTO AREA AND THE ANALYSIS OF 18 JANUARY 2017 M.G. Ciaccio, D. Latorre, B. Castello, L. Margheriti Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy 18 January 2017. On August 24 2016, a strong earthquake of magnitude Mw 6.0 hit central Italy starting a long and important seismic sequence (the Amatrice-Visso-Norcia, AVNss, seismic sequence). Two months later it was followed, on 26 October 2016, by the second large shock, the Mw 5.9 Visso earthquake, about 25 km to the north. Four days later, on 30 October, occurred the largest event of the sequence, the Mw 6.5 Norcia earthquake, enucleated between the two previous mainshocks of Amatrice and Visso. The 18 January 2017 the seismic activity migrated at the southern termination of the activated region and four earthquakes with a magnitude 5.1≤Mw≤ 5.5 followed in a few hours, with their epicenters near the town of Capitignano, 15 km south from Amatrice, and hypocenters located between 8.3 and 9.8 km depth. During the January 18 th , about 700 earthquakes occurred, 8 with M≥4.0 and 50 with M≥3.0. The seismic activity of the AVNss is concentrated around the area of ​Capitignano, in the basin of Campotosto, and in the plain of Montereale, before resuming in the whole area of ​the sequence in the following days. The area activated on January the 18 th was affected by strong historical earthquakes in 1619 and 1672; moreover other strong earthquakes occurred in neighboring area, in 1639, plus the multiple shocks sequence in January-February 1703 (Rovida et al. , 2016). The analysis of the background seismicity, based on the Catalogue of the Italian Seismicity (CSI, Castello et al. , 2006; http://csi.rm.ingv .it/), and the Bollettino Sismico Italiano of INGV (Bollettino Sismico Italiano doi:10.13127/BOLLETTINO/2016.01, ISIDe working group, version 1.0) revealed that the space-time distribution of the instrumental seismicity