| NUKLEONIKA 2010, 55(4):507-511
A RADON ANOMALY IN SOIL GAS AT CAZZASO, NE ITALY,
AS A PRECURSOR OF AN ML = 5.1 EARTHQUAKE
Janja Vaupotič1, Anna Riggio2, Marco Santulin2, Boris Zmazek1, Ivan Kobal1
1 Jožef Stefan Institute, 39 Jamova Str., 1000 Ljubljana, Slovenia
2 Istituto Nazionale di Oceanografia e di Geofisica
Sperimentale,
Borgo Grotta Gigante 42/C 34010 Sgonico (Trieste), Italy
At Cazzaso (Friuli) in northeast Italy, radon (222Rn) activity concentration in soil gas in a borehole at a depth of 80 cm has been monitored continuously (at a frequency of once an hour) since May 2004, using a Barasol probe (Algade, France). In addition, environmental parameters (air and soil temperature, barometric pressure) have been recorded. The results have been evaluated and the relationship between radon levels and seismic activity is discussed. Correlation between radon concentration and barometric pressure has been observed. Preliminary results have shown a distinct radon anomaly prior to some earthquakes.
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