Degassing of CO2, CH4, Rn and Hg in the rupture zones produced by Wenchuan M-s 8. 0 earthquake

作者：Zhou XiaoCheng^*; Sun FengXia; Chen Zhi; Lu ChaoJia; Li Jing; Wu KeTian; Du JianGuo

来源：Acta Petrologica Sinica, 2017, 33(1): 291-303.

• Soil gas
• Flux
• Rn
• CO2
• Hg
• Wenchuan earthquake

Large amounts of greenhouse gases, radioactive gases and toxic gases (e. g. CO2, CH4, Rn and Hg) could be emitted from seismic active faults into the atmosphere with effect to the atmospheric environment. The flux of CO2, Rn and Hg along rupture zones were investigated by static chamber techniques and the total anualy output of CO2 and Hg to atmosphere were estimated. The results indicated (1) The maximum anomalies of CO2, CH4, Rn and Hg concentration in soil gas along co-seismic rupture zones reached values of 7. 98%, 2. 38%, 524. 30kBq/m(3) and 161. 00ng/m(3), respectively. The average flux of CO2, Rn and Hg from co-seismic rupture zones were 34. 95g . m(-2)d(-1), 36. 11mBq . m(-2)s(-1) and 26. 56ng . m(-2)h(-1), respectively. The maximum flux of CO2, Rn and Hg reached 259. 23g . m(-2) d(-1), 580. 35mBq . m(-2) s(-1) and 387. 67ng . m(-2) h (2) The total output of CO2 and Hg degassing estimated along siesmic ruptures were approximately 0. 95Mt . y(-1) and 15. 94kg . y(-1). The flux of CO2, Rn and Hg in soil gas were affected not only by the permeability of rupture zones, but also by gas sources from natural gas reservoir, coal seams and phosphat, etc.

• 出版日期2017-1
• 单位中国地质大学（北京）; 防灾科技学院; 中国地震局地震预测研究所