Abstract
The results of seismogeochemical monitoring of subsurface gases associated with ground-waters from deep artesian wells in Matsuyama, Japan, are presented. The weekly collections of bubble-gas samples from the two borehole wells and gas chromatographic determinations of their He/Ar, H2/Ar, N2/Ar, and CH4/Ar ratios for the recent nineteen months have revealed that the bubble-gas CH4/Ar ratios at the two stations are correlated with the seismic activity in this area. Positive anomalies of the CH4/Ar ratio were accompanied by five earthquakes with relatively large magnitudes and/or relatively small epicentral distances among thirty earthquakes that occurred during the monitoring period. The anomalous increases in the CH4/Ar ratio had evidently begun prior to the respective earthquakes.
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