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[1]LIU Fengli,ZHOU Xiaocheng,LI Ying,et al.Geochemical Characteristics of the Soil Gases in the Xianshuihe-Xiaojiang Fault Zone[J].Journal of Seismological Research,2023,46(01):1-12.[doi:10.20015/j.cnki.ISSN1000-0666.2023.0004 ]

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Geochemical Characteristics of the Soil Gases in the Xianshuihe-Xiaojiang Fault Zone

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 46 Number of periods: 2023 01 Page number: 1-12 Column: 地震地下流体监测预报理论及技术应用专栏 Public date: 2023-01-01

Title:: Geochemical Characteristics of the Soil Gases in the Xianshuihe-Xiaojiang Fault Zone

Author(s):: LIU Fengli¹; ZHOU Xiaocheng¹; LI Ying¹; HE Miao¹; TIAN Jiao¹; LI Jingchao¹; DONG Jinyuan¹; YAN Yucong¹; OUYANG Shupei¹; YAO Bingyu¹; WANG Yuwen¹; ZENG Zhaojun¹; CHEN Qufei²; LUO Zhixin¹; JI Gengfeng¹; (1.United Laboratory of High Pressure Physics and Earthquake Science,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China)(2.Economic and Technological Development Zone Brigade,Fire and Rescue Detachment of Urumqi,Fire and Rescue Department of Xinjiang Uygur Autonomous Region,Urumqi 830009,Xinjiang,China)

Keywords:: soil gas; geochemistry; earthquake; the Xianshuihe-Xiaojiang Fault Zone

CLC:: P315.724

DOI:: 10.20015/j.cnki.ISSN1000-0666.2023.0004

Abstract:: The concentration of soil gases CO₂,CH₄,H₂,Rn,Hg in the Xianshuihe-Xiaojiang Fault Zone was measured across the Fault,the spatial distribution characteristics of these soil gases and their causes were analyzed,and the geochemical characteristics of the soil gases and the fault's activity were discussed.In April 2021,a total of 10 surveying areas were arranged in the Xianshuihe-Xiaojiang Fault Zone,and 4 surveying profiles were arranged in each surveying area for soil gas measurement,with a total of 640 survey points.The measurement results show that:① The average soil gas concentration of CO₂,CH₄,H₂,Rn,Hg in the Xianshuihe-Xiaojiang Fault Zone is 0.4%,12.0 ppm,5.3 ppm,13.53 kBq/m³ and 11.29 ng/m³,respectively.② The high values of the soil gas concentration in the Luhuo Section of the Xianshuihe Fault,in the Mianning-Xichang section of the Anninghe Fault and in the Zemuhe Fault show that the shorter the elapsed time of the historical large earthquake is,the higher the sliding rate of the Fault will be.The intenser the activity of recent small earthquakes is,the more developed the fault fissures will be,and the higher the soil gas concentration will be.The low values of the soil gas concentration of the Xuemenkan Fault in the Xianshuihe Fault Zone and the North section of the Xiaojiang Fault Zone show that the shorter the elapsed time of the historical large earthquakes is,the weaker the current seismicity of the Fault will be.The lower the sliding rate of the faultis,and the lower the development of the fault fissures is,the lower the soil gas concentration will be.

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Last Update: 2023-01-01