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《Seismology and Geology》 2011-01
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THE GEOCHEMICAL CHARACTERISTICS OF SOIL GAS IN THE SOUTHEASTERN PART OF HAIYUAN FAULT

ZHOU Xiao-cheng1,2) WANG Chuan-yuan3) CHAI Chi-zhang4) SI Xue-yun4) LEI Qi-yun4) LI Ying2) XIE Chao2) LIU Sheng-chang5) 1)School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China 2)Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China 3)Yantai Institute of Coastal Zone Research,Chinese Academy of Sciences,Yantai 264003,China 4)Earthquake Administration of Ningxia Hui Autonomous Region,Yinchuan 750001,China 5)Hebei Polytechnic University,Tangshan 063009,China  
The concentration of soil gas He,H2,N2,O2,CH4,C2H6,Rn,Hg and flux of soil gas He,H2,CH4,Rn,Hg were surveyed at four sites(Xiaokou,Bazhiyao,Caixiangpu and Xiaonanchuan)in the southeastern part of Haiyuan Fault.Soil-gas concentrations of more than 200 samples were obtained.The results show that the background values of N2/O2,Hg,Rn were 4.2,50.4ng/m3and 5.8k Bq/m3,respectively.The maximum concentrations of He and CH4 were 65.3 and 537.7ppm,respectively,at the end of the southeastern part of Haiyuan Fault.Furthermore,soil gas He and CH4 were intensively degassed.The maximum flux of He and CH4 in soil gas was 6.9and 390mg m-2d-1,respectively.These may be caused by stress concentration at the end of the southeastern part of Haiyuan Fault.H2 and Rn in soil gas were powerful components as indicators of location of the southeastern part of Haiyuan Fault.The maximum concentrations of H2 and Rn in soil gas were 369.7ppm and 38.3k Bq/m3 near the middle of the southeastern part of Haiyuan Fault.The maximum fluxes of H2 and Rn in soil gas were 5.5mg m-2d-1 and 828.6m Bqm-2s-1,respectively.These may be related with the intensive rupture of the middle of the southeastern part of Haiyuan Fault.The anomalies of Hg in soil gas at the fault were good reference indicators.The maximum flux of Hg in soil gas was 211.2ng m-2h-1.
【Fund】: 中国地震局地震预测研究所基本科研业务专项(0207690234)资助
【CateGory Index】: P315.724
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