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[1]LU Chang,LI Ying,HU Le,et al.Study of the Flux of Soil Gas Rn and Its Relation with Seismicity in Tangshan Area[J].Journal of Seismological Research,2022,45(02):241-248.[doi:10.20015/j.cnki.ISSN1000-0666.2022.0029]

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Study of the Flux of Soil Gas Rn and Its Relation with Seismicity in Tangshan Area

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 45 Number of periods: 2022 02 Page number: 241-248 Column: Public date: 2022-05-20

Title:: Study of the Flux of Soil Gas Rn and Its Relation with Seismicity in Tangshan Area

Author(s):: LU Chang¹; 2; LI Ying²; HU Le²; ZHAO Ce¹; LIU Zhaofei²; 3; SHAO Junjie²; CHEN Zhi²; (1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)(2.Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(3.School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China)

Keywords:: soil gas; Rn flux; Rn concentration; b-value; Tangshan area

CLC:: P315.724

DOI:: 10.20015/j.cnki.ISSN1000-0666.2022.0029

Abstract:: Using the data of the flux of soil gas Rn measured by us at 196 points in Tangshan region in 2021,together with the data of the soil gas concentrations measured in this region in 2010,we study the geochemical variation and the controlling factors of the flux of soil gas Rn.The results show that:①The flux of soil gas Rn ranges from 0.01 to 409.31 mBq/(m²·s),with a mean value of 40.58 mBq/(m²·s).The high values are distributed in the fault zones or interaction parts of the fault zones.②The concentration of soil gas Rn is consistent with the spatial distribution of high values of the flux.In the northern part of the study area,the lower b-values spatially correspond well with the high values of the flux of soil gas Rn.③Rn flux measurements are less sensitive to the environmental factors(ground temperature,air temperature and elevation),and are insignificantly related to the activity of present-day,small earthquakes.④Fluxes and concentrations of soil gas Rn are consistent with the spatial distribution of b-values; high fluxes and high concentrations corresponding to low b-values.This suggests that the intensity of the degassing of soil gas Rn may be related to the high permeability of active fault zones and the high stress in the active fault zones.

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Last Update: 2022-05-20