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[1]ZHAO Ying,CHEN Zhi,LYU Jian,et al.Geochemical Characteristics of Soil Gas(Rn,CO2)in the Ruichang Basin,Jiangxi Province[J].Journal of Seismological Research,2023,46(04):542-550.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0059 ]

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Geochemical Characteristics of Soil Gas(Rn,CO₂)in the Ruichang Basin,Jiangxi Province

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 04 Page number: 542-550 Column: Public date: 2023-07-15

Title:: Geochemical Characteristics of Soil Gas(Rn,CO₂)in the Ruichang Basin,Jiangxi Province

Author(s):: ZHAO Ying¹; 2; CHEN Zhi³; LYU Jian¹; 2; XIAO Mengren¹; 2; HU Tingxia¹; 2; LIU Zhaofei³; HE Hongyi³; LUO Qibin⁴; WANG Chengnan⁵; HU Xudong⁴; (1.Observatory for Geodynamic of the East Yangtze Block in Jiujiang,Jiangxi Province,Jiujiang 332006,Jiangxi,China)(2.Jiangxi Earthquake Agency,Nanchang 330096,Jiangxi,China)(3.CEA Key Laboratory of Earthquake Forecasting,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(4.Engineering Research Center for Seismic Disaster Prevention and Engineering Geological Disaster Detection of Jiangxi Province,Nanchang 330013,Jiangxi,China)(5.Geological Survey of Jiangxi Province,Nanchang 330096,Jiangxi,China)

Keywords:: the Jiujiang-Ruichang earthquake; soil gas; geochemistry; Rn; CO₂

CLC:: P315.724

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0059

Abstract:: The concentration of the soil gases Rn and CO₂ at 139 sites within 140 km² in the Ruichang Basin,in which the epicenter of the Jiujiang-Ruichang M_S5.7 earthquake on November 26,2005 is located,is measured.The geostatistical analysis shows that the background values of the concentration of Rn and CO₂ are 7 330 Bq/m³,0.50%,and the abnormal boundary values of the concentration are 27 500 Bq/m³,6.00%,respectively.The anomalous values of Rn are distributed in NE direction,which is consistent with the current state of tectonic stress field in northern Jiangxi.The zone which has synchronous high-value anomaly of Rn and CO₂ is in line with the Ruichang-basin southeast marginal fault and the Liujia-Fanjiapu-Chengmenshan marginal fault.The distribution of abnormal concentration of Rn and CO₂ shows that the fault activity in the southeast direction of the Ruichang Basin is stronger than that in the northwest direction.The earthquake activity in the Ruichang Basin may be closely related to the fault structure in the southeast direction of the Basin.

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Last Update: 2023-10-01