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The present work is proposed to investigate the spatiotemporal variations in soil gas Rn and CO 2 across the active faults in the capital area of China in order to understand fault activities and assess seismic hazard. A total of 342 soil gas sampling sites were measured twice in 2011 and 2012 along seven profiles and across four faults. The results of soil gas surveys show that, in each profile, due to the variation in gas emission rate, the concentrations of Rn and CO 2 changed in thedoi:10.5194/nhessd-2-1729-2014 fatcat:3547yt6tgjgp5ou4ags4wvurri