Processing of radon time series in underground environments: Implications for volcanic surveillance in the island of Tenerife, Canary Islands, Spain

Spatiotemporal variation of radon and carbon dioxide concentrations in an underground quarry: coupled processes of natural ventilation, barometric pumping and internal mixing

“…As noticed before, the effect of atmospheric pressure variation, to first order, is taken into account in a satisfactory manner. Similar results have been shown by other workers (EffDarwich et al, 2002;Viñ as et al, 2007). The radon exhalation flux is also shown in Fig.…”

“…However, given the delicate non-linear and time-dependent nature of the processes driving temporal variation, it is important to be aware of the potential problems. Approaches using linear multi-component models (Finkelstein et al, 1998;Zmazek et al, 2003), which are sometimes used for the reduction of radon time series, are not likely to be successful and, instead, dedicated models, incorporating an explicit physical comprehension of the underlying processes, should be developed (Viñ as et al, 2007;Eff-Darwich et al, 2002. Thanks to physical modelling, the various processes can be deciphered and new geodynamical processes ultimately should be distinguished from the intrinsic coupled processes characterizing a given system.…”

“…In underground environments, radon-222 concentration is often characterized by large temporal variation, mainly caused by seasonal changes in natural ventilation (Wilkening and Watkins, 1976) and by atmospheric pressure variation (Clements and Wilkening, 1974;Eff-Darwich et al, 2002;Viñ as et al, 2007). Other causes of transient temporal variation have been reported, such as water infiltration (Perrier et al, 2007) or hydromechanical effects in the vicinity of an artificial lake (Trique et al, 1999;Richon et al, 2005).…”

Investigation of temperature and barometric pressure variation effects on radon concentration in the Sopronbánfalva Geodynamic Observatory, Hungary

“…Thus, the amount of radon exhalation depends on the elastic properties and porosity of the rocks and on the local fracture system (e.g. Holub and Brady, 1981;Kies et al, 2002Kies et al, , 2005Vaupoti c et al, 2010) and shows large temporal variations due to meteorological and hydrological effects (Garavaglia et al, 1999;Vargas and Ortega, 2006;Papp et al, 2008;Smetanova et al, 2010;Steinitz and Piatibratova, 2010;Szab o et al, 2013). Analysis of temporal variations in the radon gas concentration is a useful tool to study geodynamic processes associated with tectonic (Garavaglia et al, 1998Aumento, 2002;Omori et al, 2007;Mahajan et al, 2010;Utkin and Yurkov, 2010) and volcanic (Toutain and Baubron, 1999;Viñas et al, 2007) activities as well as in looking for a warning sign for earthquakes (Igarashi et al, 1995;Yong and Wei, 1995;Garavaglia et al, 1999;Virk et al, 2000;Crockett et al, 2006;Kawada et al, 2007;Inan et al, 2008;Yasuoka et al, 2009;Crockett and Gillmore, 2010;Cigoliní et al, 2015).…”

Assessment the Health Hazard from 222Rn in Old Metalliferous Mines in San Luis, Argentina

“…Variations in the flux of radon are caused only by physical factors, since it is not a reactive species. Hence, the characterization of the radon flux in an environment could give valuable information on dynamical transport processes (Viñas et al 2007). In addition, 238 U can be oxidized and mobilized by groundwater flow.…”