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[en] Precursory changes in the radon concentration of groundwater were observed prior to the Iau-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%. After the earthquake, a remarkable increase in the radon concentration occurred
Journal
Science (Washington, D.C.); ISSN 0036-8075; 
; v. 207 p. 882-883
; v. 207 p. 882-883