Helium/Carbon Dioxide Ratios as Premonitors of Volcanic Activity

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Science  15 Jun 1979:
Vol. 204, Issue 4398, pp. 1195-1196
DOI: 10.1126/science.204.4398.1195


The composition of the gaseous emissions of two fumaroles at the summit of Kilauea Volcano was monitored for môre than 2 years. Magma was released from the summit reservoir on three occasions during this period; prior to or during each event the ratios of helium to carbon dioxide in the fumarole gases decreased substantially from that observed during periods of quiescence.