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Science 22 February 1980:
Vol. 207. no. 4433, pp. 882 - 883
DOI: 10.1126/science.207.4433.882
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Articles

Radon Anomaly: A Possible Precursor of the 1978 Izu-Oshima-kinkai Earthquake

HIROSHI WAKITA 1, YUJI NAKAMURA 1, KENJI NOTSU 2, MASAYASU NOGUCHI 3, and TOSHI ASADA 4

1 Laboratory for Earthquake Chemistry, University of Tokyo, Tokyo, 113 Japan
2 Department of Chemistry, Tsukuba University, Ibaraki, 300-31 Japan
3 Radioisotope School, Atomic Energy Research Institute, Tokyo, 113 Japan
4 Geophysical Institute, University of Tokyo

Precursory changes in the radon concentration of groundwater were observed prior to the Izu-Oshima-kinkai earthquake (magnitude 7.0) 14 January 1978. The distance from the epicenter to a continuous radon-monitoring station at Nakaizu was about 25 kilometers. A sudden drop and a subsequent increase in the radon concentration recorded on 9 January 1978 were significant. The size of the spike-like change was about 15 percent. After the earthquake, a remarkable increase in the radon concentration occurred.

Submitted on August 30, 1979
Revised on November 5, 1979


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Ground-Water Radon Anomaly Before the Kobe Earthquake in Japan.
G. Igarashi, G. Igarashi, S. Saeki, N. Takahata, K. Sumikawa, S. Tasaka, Y. Sasaki, M. Takahashi, and Y. Sano (1995)
Science 269, 60-61
   Abstract »    PDF »
Recent Earthquake Prediction Research in Japan.
K. Mogi and K. MOGI (1986)
Science 233, 324-330
   Abstract »    PDF »


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