Spatial variations of radon and helium concentrations in soil-gas across the Shan-Chiao fault, Northern Taiwan

Methane Venting in Gas Hydrate Potential Area Offshore of SW Taiwan: Evidence of Gas Analysis of Water Column Samples

“…2). The detection limit and error of radon concentration are similar to those described in soil gases (Fu et al 2005;Yang et al 2005b;Walia et al 2005a).…”

A possible link between radon anomaly and earthquake

“…Soil gas is a mixture of different compositions (e.g., Fu et al, 2005;Hong et al, 2010): one coming from a shorter distance and enter into the measuring instrument through diffusion and another of deep origin carried upward by rising gases/water column to the subsurface (Walia et al, 2005a;Yang et al, 2005). When radon emission is due to diffusion only, the effect of meteorological parameters must be very significant.…”

“…The stress centers form strain fields and stress gradients of diminishing magnitude towards the periphery. These pre-earthquake stress gradients move underground fluids, carrying some dissolved gases such as radon, helium, methane, carbon dioxide, nitrogen etc., to the subsurface region, mainly through faults, lineaments and thermal areas, which are highly permeable pathways for soil-gas (Yang et al, 2003(Yang et al, , 2006Chyi et al, 2005Chyi et al, , 2010Chyi et al, , 2011Fu et al, , 2008Walia et al, 2005aWalia et al, , 2005bWalia et al, , 2008Walia et al, , 2009Walia et al, , 2010Choubey et al, 2007;Yang, 2008;Montazeri et al, 2011;Woith et al, 2011). So subsoil radon anomaly is observed in the soil-gas measurements at or near a fault and/or a lineament before and after an earthquake.…”

Measurement of Anomalous Radon Gas Emanation Across the Yammouneh Fault in Southern Lebanon: A Possible Approach to Earthquake Prediction

“…2.1 and referred to in the text as Rn, by measuring Rn emanation from the subsurface near the fault trace as has been done by many researchers worldwide (Yang et al 2003;Walia et al 2005;Papp et al 2008;Kuo et al 2009;Walia et al 2009;Richon et al 2010;Baykut et al 2011;Bhongsuwan et al 2011). The variability of radon gas concentrations due to seismic activity along a fault plane boundary shows positive results related to the stress and strain behavior of the faults.…”