Abstract
Based on the convection and diffusion mechanisms of radon migration, in this paper we deduce the two-dimensional differential equation for radon transportation in the overburden above active fault zones with an unlimited extension along the strike. Making use of the finite difference method, the radon concentration distribution in the overburden above active faults is calculated and modeled. The active fault zone parameters, such as the depth and the width of the fault zone, and the value of radon concentration, can be inverted from the measured radon concentration curve. These realize quantitative interpretation for radon concentration anomalies. The inversion results are in good agreement with the actual fault zone parameters.
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Abdoh, A., and Pilkington, M., 1989, Radon emanation studies of the Ile Bizard Fault, Montreal: Geoexploration, 25(4), 341–354.
Csige, I., Hakl, J., and Lakatost, I., 1995, Measurement of effective diffusion coefficient of radon in porous media with etched track radon monitors: Radiation Measurements, 25(1–4), 659–660.
Fleischer, R. L., Hart, H. R., and Mogro-Campero, A., 1980, Radon emanation over an ore body: search for long-distance transport of radon: Nuclear Instruments and Methods, 173(1), 169–181.
Iakovleva, V. S., and Ryzhakova, N. K., 2003, A method for estimating the convective radon transport velocity in soils: Radiation Measurements, 36(1), 389–391.
Ioannides, K., Papachristodoulou, C., Stamoulis, K., Karamanis, D., Pavlides, S., Chatzipetros, A., and Karakala, E., 2003, Soil gas radon: a tool for exploring active fault zones: Applied Radiation and Isotopes, 59(2–3), 205–213.
Iskandar, D., Iida, T., Yamazawa, H., Moriizumi, J., Koarashi, J., Yamasoto, K., Yamasaki, K., Shimo, M., Tsujimoto, T., Ishikawa, S., Fukuda, M., and Kojima, H., 2005, The transport mechanisms of 222Rn in soil at Tateishias an anomaly spot in Japan: Applied Radiation and Isotopes, 63(2), 401–408.
Jönsson, G., 1995, Radon gas — where from and what to do?: Radiation Measurements, 25(1–4), 537–546.
Kristriansson, K., and Malmqvist, L., 1982, Evidence for non-diffusive transport of 222Rn in the ground and a new physical model for the transport: Geophysics, 47(10), 1444–1452.
Liu, J. H., Wang, Z. W., Liu, S. T., and Wang, X.. L., 2006, The evaluation method of soil radon and mercury gas measurement on urban active fault zones: Journal of Jilin University (Earth Science Edition), 36(2), 295–297.
Liu, J. H., Wang, Z. W., Tian, G., and Wang, X. L., 2007, Numerical simulation for radon migration in the homogeneous overburden: Chinese Journal of Geophysics, 50(3), 269–273.
Malmquist, L., Isaksson, M., and Kristiansson, K., 1989, Radon migration through soil and bedrock: Geoexploration, 26(2), 135–144.
Mogro-Campero, A., and Fleischer, R. L., 1977, Subterrestrial fluid convection: a hypothesis for long-distance migration of radon within the earth: Earth and Planetary Science Letters, 34(2), 321–325.
Morin, J. P., Seidel, J. L., and Monnin, M., 1993, A tridimensional model for radon transport in a porous medium: Nuclear Tracks and Radiation Measurement, 24(1–4), 415–418.
Mujahid, S. A., Hussain, S., Dogar, A. H., and Karim, S., 2005, Determination of porosity of different materials by radon diffusion: Radiation Measurements, 40(1), 106–109.
Swakon’, J., Kozak, K., Paszkowski, M., Gradzin’ski, R., Loskiewicz, J., Mazur, J., Janik, M., Bogacz, J., Horwacik, T., and Olko, P., 2004, Radon concentration in soil gas around local disjunctive tectonic zones in the Krakow area: Journal of Environmental Radioactivity, 78(2), 137–149.
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Liu Jinghua received her PhD from the Department of Geophysics in the College of Geo-Exploration Science and Technology at Jilin University in 2006, her Master degree of Solid Geophysics at Jilin University in 2002, and her Bachelor degree of Exploration Geophysics at East China College of Geology in 1985. She is currently a Professor at Jilin University. Her interests are Nuclear Geophysics, Radiation and Environmental Evaluation.
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Liu, J., Wang, Z. & Wang, X. The numerical simulation and inversion fitting of radon concentration distribution in homogeneous overburden above active fault zones. Appl. Geophys. 5, 238–244 (2008). https://doi.org/10.1007/s11770-008-0034-2
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DOI: https://doi.org/10.1007/s11770-008-0034-2