Abstract
Two CH4-rich (> 80% vol.) gas seeps situated in the French Alps have been characterized in order to get a detailed overview of the gas phases and their spatial variability. Albeit set in similar geological settings, the Le Gua and Rochasson gas seeps present some differences in C2H6 or CO2 contents. Gas fluxes emitted into the atmosphere suggest that few hundreds of kg of CH4 are emitted each day from the seep area of Le Gua together with tens of kg of CO2. Emissions at Rochasson are one order of magnitude lower and only consist in CH4 venting. Site monitoring techniques and strategies are discussed.
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