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Science 15 June 1979:
Vol. 204. no. 4398, pp. 1195 - 1196
DOI: 10.1126/science.204.4398.1195
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Articles

Helium/Carbon Dioxide Ratios as Premonitors of Volcanic Activity

DONALD M. THOMAS 1 and J. J. NAUGHTON 1

1 Hawaii Institute of Geophysics, University of Hawaii at Manoa, Honolulu 96822

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.

Submitted on January 23, 1979
Revised on March 20, 1979

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Science. ISSN 0036-8075 (print), 1095-9203 (online)