GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 2.1 329 Although the presence of meteorological clouds prevents to guarantee continuity to the observations and to fully appreciate possible space–time persistence of TAs, the analysis performed by applying previously established correlation rules to all identified SSTAs highlighted : - more than 77% of all identified SSTAs occur in the pre-fixed space-time window around the occurrence time and location of earthquakes (M≥4); - smaller than 22% of all identified SSTAs apparently not related to documented seismic activity. References Dobrovolsky I.P., Zubkov S.I. and Miachkin V.I.; 1979: Estimation of the size of earthquake preparation zones . Pure Appl Geophys PAGEOPH 117:1025–1044. doi:10.1007/BF00876083. Tramutoli V.; 1998 : Robust AVHRR Techniques (RAT) for Environmental Monitoring: theory and applications . In: Zilioli E (ed) Proc. SPIE. pp 101–113. Tramutoli V.; 2005: Robust Satellite Techniques (RST) for natural and environmental hazards monitoring and mitigation: ten year of successful applications . In: Liang S., Liu J., Li X., Liu R. and Schaepman M. (eds) 9 th . Int. Symp. Phys. Meas. Signatures Remote Sensing, IGSNRR, Beijing, China, pp 792–795. Tramutoli V.;2007: Robust Satellite Techniques (RST) for Natural and Environmental Hazards Monitoring and Mitigation: Theory and Applications . Int. Work. Anal. Multi-temporal Remote Sens. Images. IEEE, pp 1–6. Tramutoli V., Corrado R., Filizzola C., Genzano N., Lisi M. and Pergola N.; 2015a: From visual comparison to Robust Satellite Techniques: 30 years of thermal infrared satellite data analyses for the study of earthquakes preparation phases . Boll di Geofis Teor ed Appl, 56 , n. 2, pp. 167-202. Tramutoli V., Corrado R., Filizzola C., Genzano N., Lisi M., Paciello R. and Pergola N.; 2015b: One year of RST based satellite thermal monitoring over two Italian seismic areas . Boll Di Geofis Teor ed Appl. Vol. 56 , n.2, pp. 275-294. Numerical investigation of the November 17, 2015 anomaly in the harbor of Crotone, Ionian Sea F. Zaniboni, A. Armigliato, G. Pagnoni, M. A. Paparo, S. Tinti Dipartimento di Fisica e Astronomia, Alma Mater Studiorum - Università di Bologna, Bologna, Italy On November 17, 2015 an earthquake of magnitude measured 6.5 hit the island of Lefkada (Greece), in the Ionian Sea. The epicenter was located off the western coast, at a relative shallow depth, and was interpreted as the activation of a well-known strike-slip fault, dipping eastward, that produced similar events in the past (see Ganas et al ., 2016 and references therein for further details). The earthquake provoked two casualties, damages in some villages of the island, and many small landslides and rockfalls. In the far field, the ground shaking was clearly felt also in Southern Italy. Concerning the generation of tsunami, such kind of focal mechanisms are known not to provide a significant displacement of the sea surface, and indeed no relevant perturbations were measured by the tide gauges located in the surroundings. The only exception came from the port of Crotone (Calabria, Southern Italy) about 250 km far from the source, where a clear anomaly of the sea level signal was noticed starting from about one hour after the earthquake occurrence. The perturbation, ranging 23 cm peak-to-peak, affected the port basin for at least 2 hours, with very regular 7-minute-period oscillations that decreased very slowly in time. Many scientific (and also operational) issues can be raised concerning this event: the perturbation can be associated with the Lefkada earthquake, but the fact that only in Crotone