Two year evolution of radon emission and tectonic movements in Tuzla Fault, Seferihisar-İzmir

•Continuous soil gas radon measurements in Tuzla Fault Line.•Long term evaluation of radon as earthquake precursor.•Effect of meteorological parameters on radon levels.

Previous studies showed that tectonic movement and meteorological events are accompanied with radon release. In this study soil gas radon and tectonic movements were investigated with meteorological factors taking into account. Soil gas radon measurements were collected over a-two year period (2008–2010) at the Tuzla Fault in Turkey. The relationship between radon anomalies and seismic activities was evaluated using Dobrovolsky's form. It is shown that not only magnitude of earthquake but also distance from the measurement site should be used for identifying radon anomalies.