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Science 28 April 1978:
Vol. 200. no. 4340, pp. 430 - 432
DOI: 10.1126/science.200.4340.430
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Articles

"Helium Spots": Caused by a Diapiric Magma from the Upper Mantle

HIROSHI WAKITA 1, NAOYUKI FUJII 2, SADAO MATSUO 3, KENJI NOTSU 4, KEISUKE NAGAO 5, and NOBUO TAKAOKA 5

1 Department of Chemistry, University of Tokyo, Tokyo 113, Japan
2 Geophysical Institute, University of Tokyo
3 Department of Chemistry, Tokyo Institute of Technology, Tokyo 152
4 Department of Chemistry, Tsukuba University, Ibaragi 300-31, Japan
5 Department of Physics, Osaka University, Toyonaka, Osaka 560, Japan

"Helium spots," where a significant amount of helium is present in the soil [up to 350 parts per million with a high 3He to 4He ratio of (8.90 ± 0.31) x 10–6], have been found along the fault zone formed by the 1966 Matsushiro swarm earthquakes. The formation of the "helium spots" and the occurrence of the earthquakes are interpreted as the results of a diapiric uprise of a magma approximately 1 kilometer in diameter.

Submitted on November 28, 1977
Revised on January 24, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Hydrogen Release: New Indicator of Fault Activity.
H. Wakita, H. WAKITA, Y. NAKAMURA, I. KITA, N. FUJII, and K. NOTSU (1980)
Science 210, 188-190
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Science. ISSN 0036-8075 (print), 1095-9203 (online)