GNGTS 2015 - Atti del 34° Convegno Nazionale

GNGTS 2015 S essione 2.1 39 in the case of the Cazzaso site, the difference is in the order of 5%, showing no dependence of radon values from atmospheric influence. The temperature data have been recorded by the Tolmezzo meteorological station (5 km away), managed by Friuli-Venezia Giulia Region (www. meteo.fvg.it) , and the atmospheric pressure by the amateurs site MeteoMin of Udine (www. meteomin.it ). The radon values over the 2-sigma value are the same in the original series and in the corrected series (Fig. 1). The anomalous period between 2006 and 2008 was confirmed also in the corrected time series of Cazzaso. Fig. 1 – Radon in soil time series acquired at Cazzaso -Friuli- (blue line), corrected by meteorological parameters by PCAmethod (brown line), Temperature (heavenly line) and Pressure (pink line). The 2 - sigma over different periods are marked as reported in Legenda. Tab. 3 - Characteristics of the anomalies detected in the Cazzaso time series. ANOMALY PERIOD DURATION AMPLITUDE MAGNITUDE PRECURSOR TIME Distance (MD) (km) 14-11-2002/18-11-2002 5 days 78.43% 3.3+3.7 4 months < 20 30-06-2003/10-07-2003 10 days 42.94% 3.7 61 days < 30 24-12-2003/02-07-2004 6 months + 8 days 755.5% 5.1 + 5.1 6,5 months / < 250 11 months 24-08-2004/25-08-2004 1day 25.9% 3.3 + 3.8 5 days < 30 04-02-2005/04-03-2005 1 month 109% 3.3 1 month + 19 days < 40 02-07-2005/13-07-2005 11 days 64.72% 3.4 5 months + 10 days < 35 11-08-2006/31-03-2009 2 years + 7 months 328.39% 6.1 (1) 2 years + 7 months + < 500 26 days 17-02-2007/18-02-2007 2 days 201.46% 3.9 + 3.7 9 days < 50 16-02-2008/18-02-2008 3 days 129.03% 3.7 13 days < 25 15-07-2008/17-07-2008 2 days 167% 5.5 5 months + 8 days < 350 11-03-2011/18-03-2011 7 days 298.65% 3.1 + 5.0 4 months + 6 days < 350 07-09-2011/07-09-2011 1 day 182% 4.4 1 month + 22 days < 350 15-05-2012/16-05-2012 2 days 167.55% 5.8 (1) 5 days < 250 14-01-2013/20-01-2013 6 days 493% 4.8 11 days < 400 11-02-2013/13-02-2013 3 days 684% 3.8 1 day (cosismic) < 40 (1) The reported magnitude is MW (ISIDe, 2009; 2012).