Abstract
Tritium concentrations are used to trace water circulation in the Beppu geothermal system, Japan. Although tritium concentrations in most subsurface waters decrease with depth and are zero at several hundred meters, tritium concentrations in high-temperature waters at Beppu are relatively high, even from relatively deep zones, and have negative linear correlation with chloride concentrations. Meteoric water is evidently mixed rapidly with deep chloride-rich waters in the geothermal system. Active vertical circulation within the liquid-dominated zone is concentrated in the relatively limited region along the Asamigawa fault, indicating the importance of conduits within the fractured rock. Waters move through this system at a rate of approximately 60 m/yr and have a mean residence time of about 50 yr.
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