“…The concentrations of soil gas can be affected by seismotectonic activity, rock types, porosity and composition of soil, meteorological parameters (e.g., temperature, precipitation and air moisture) and structural type (Hinkle, 1994;Toutain and Baubron, 1999;Fu et al, 2005Fu et al, , 2008Walia et al, 2008;Lombardi and Voltattorni, 2010;Zhou et al, 2010). As meteorological parameters varied slightly between the two soil gas surveys (Fig.…”