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Diffuse degassing at Galeras volcano, Colombia, was studied during three consecutive field seasons from 1993 to 1995. Measurements of 222 Rn and CO 2 were made at 30 stations which were distributed on the volcano and on regional faults intersecting the edifice. Time series data show a decline of radon soil gas of up to 50% prior to a M 2.8 earthquake on 12 August 1993 at stations located...
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