Secular variations in helium isotope ratios in an active volcano - Eruption and plug hypothesis

Details Secular variations in helium isotope ratios in an active volcano - Eruption and plug hypothesis Secular variations in helium isotope ratios in an active volcano - Eruption and plug hypothesis

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107...95s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 1, Oct. 1991, p. 95-100.

Physics

4

Helium Isotopes, Neon Isotopes, Secular Variations, Volcanology, Ashes, Japan, Lava, Volcanoes

Scientific paper

The present study reports secular variations in He-3/He-4 and He-4/Ne-20 ratios for October 1986 to April 1991 in gas samples from a 90 C steam well located about 3 km north of Mt. Mihara, an active volcano in Japan. The He-3/He-4 and Ne-4/Ne-20 ratios increased anomalously from 4.18 R(atm) to 4.59 R(atm) and from 0.93 and 1.08, respectively, about 3 mo prior to the explosive eruption of the volcano on October 4, 1990. The He-3/He-4 enhancement may be related to the concurrent decrease in the height of volcanic smoke at the central cone.

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