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Diffuse degassing of CO2, CH4 and H2 was investigated at the surface environment of Cañadas caldera, Canary Islands, during the gas survey carried out in the summer of 1995. Soil CO2 concentration varied significantly from atmospheric levels to 30%, while soil CH4 and H2 contents ranged from 5 to 851ppm and from 0.5 to 620ppm, respectively. Soil CO2, CH4 and H2 distribution suggests that high diffuse...
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