GNGTS 2017 - 36° Convegno Nazionale

316 GNGTS 2017 S essione 2.1 were the most suitable for this study. Amplitude values of the first 6 Schumann Resonances were sampled every five minutes at these two stations. Recorded Schumann Resonances were without significant variations for one year prior to the main shock in Norcia on October 30, 2016. First and second resonances were observed this day and the following three days, see Fig. 3. Aknowledgements The author would like to thank Massimo Orsini, Adriano Nardi and Ernesto Tiberi for contributing to the installation process in Norcia, as well as Marco Eleuteri for his help in realising the Narni Station. References Fidani C.; 2011: The Central Italy Electromagnetic Network and the 2009 L’Aquila earthquake: observed electric activity. Geoscience, 1, 3-25. Fidani C. and Martinelli G.; 2015: A possible explanation for electric perturbations recorded by the Italian CIEN stations before the 2012 Emilia earthquakes, Bollettino di Geofisica Teorica ed Applicata, 56, 2, 211-226. Fidani C. and Marcelli D.; 2017: Ten Years of the Central Italy Electromagnetic Network (CIEN) Continuous Monitoring, Open Journal of Earthquake Research, 6, 73-88. Pulinets S.A., BondurV. G.,TsidilinaM. N. andGaponovaM.V.; 2010:Verificationof theConcept of Seismoionospheric Coupling under Quiet Heliogeomagnetic Conditions, Using the Wenchuan (China) Earthquake of May 12, 2008, as an Example, Geomagnetism and Aeronomy, 50, 2, 231–242. Fig. 3 - First two Schumann resonances observed at the Trasacco Station from October 27 to November 2, 2016. Magnetic perturbations observed around the October 30, 2016, Norcia earthquake, M = 6.5 M. Orsini 1 , C. Fidani 2,3,4 1 National Laboratory of Gran Sasso, L’Aquila, Italy 2 Central Italy Electromagnetic Network, Fermo, Italy 3 GEA Observatory, Foligno, Italy 4 SARA Electronic instruments, Perugia, Italy The Central Italy Electromagnetic Network (Fidani, 2011) is composed of 14 stations, including the Colfiorito and Norcia Stations which were made operative in mid and late 2016, respectively. Narni Station which was made operative at the middle of 2017, in Terni province. Trasacco and Urbino Stations were made operative in March and May 2015, in L’Aquila and Pesaro-Urbino provinces, respectively. Pozzuolo del Friuli (Udine) and Camerino (Macerata) Stations were made operative in Spring 2014. The Gubbio (Perugia) Station started to record from the beginning of 2014 but from January 2015 has been out of order, so as the Pozzuolo del Friuli Station and the Zocca Station. Then Gubbio was substituted by Urbino (Pesaro) Station. CIEN began a multi-parametric monitoring after 2011 (Fidani and Martinelli, 2015), when the Chieti Station supported terrestrial currents and magnetic component recordings. Magnetic recordings were also realised at four other stations: Città di Castello, Avigliano Umbro, Norcia and Narni.