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断裂带H2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H2浓度测量,探讨破裂带土壤气H2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H2主要来源与浅部气藏泄露直接相关;(②破裂带土壤气H2浓度平均值从映秀到南坝逐渐降低;③破裂带土壤气H2浓度随着时间推移逐渐衰减.地震断裂带内H2脱气进一步研究对大气环境研究具有重要意义.“,”Degassing of Hydrogen (H2) from fault may be a good indicator of fault activity.The concentration of H2 in soil gas in the seismic surface rupture zone produced by the Wenchuan Ms 8.0 earthquake was investigated in twenty three measuring regions in order to explore the relationship between the spatio-temporal variations of H2 concentration in soil gas along the seismic rupture zone and the vertical displacements and aftershocks activities.The results indicated:① the sources of H2 were directly related to from the release of natural gas reservoirs;②the average concentration of H2 in soil gas spatially decreased from Yingxiu to Nanba;③the magnitudes of the H2 concentration anomalies declined significantly with time.It is very significant to study the variation tendency of atmospheric environment with further research of degassing of H2 from faults.