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断裂带H_2浓度变化能很好地反映断裂的活动性。通过对汶川MS8.0地震破裂带23个测区的土壤气H_2浓度测量,探讨破裂带土壤气H_2浓度时空变化与破裂带垂直位移与余震的关系。测量结果表明:(1)破裂带土壤气H_2主要来源与浅部气藏泄露直接相关;(2)破裂带土壤气H_2浓度平均值从映秀到南坝逐渐降低;(3)破裂带土壤气H_2浓度随着时间推移逐渐衰减。地震断裂带内H_2脱气进一步研究对大气环境研究具有重要意义。
The change of H 2 concentration in the fault zone can well reflect the activity of the fault. Based on the measurement of soil H_2 concentration in 23 zones of Wenchuan MS8.0 earthquake rupture zone, the relationship between the spatial and temporal variations of H_2 concentration in soil and the vertical displacement of rupture zone and aftershocks was discussed. The results show that: (1) The main source of soil H_2 in the rupture zone is directly related to the leakage of shallow gas reservoirs; (2) The mean H_2 concentration of soil gas in the rupture zone decreases gradually from Yingxiu to Nanba; (3) The concentration gradually decays over time. Further study on the deaeration of H_2 in the seismic fault zone is of great significance for the study of atmospheric environment.