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- W2982337571 abstract "Continuous geochemical monitoring of thermal waters at Tokachidake volcano has been conducted for more than three decades to detect changes in its volcanic activity. Based on the geochemical data from 1986 to 2013, the origin and temporal changes of the thermal waters were discussed in our previous study. Here, we supplement the previous dataset with the geochemical data from 2014 to 2018 and comprehensively discuss the results of geochemical and geophysical monitoring to reveal the interactions between deep magmatic fluids, volcanic gases, and shallow aquifers. Thermal waters, discharging in the Tokachidake spa area, are formed by the interaction of volcanic gas and a shallow aquifer, and show the Cl change which have a significant correlation with the change in the volcanic plume height. This suggests a parallel volcanic gas input from the magma to the shallow aquifer and fumarole. Both changes are caused by a variation in the volcanic gas release rate from the magma. Around the 1988–1989 magmatic eruption, thermal waters in the Fukiage spa area showed remarkable thermal and chemical changes due to the interaction with the magmatic fluid (NaCl-type thermal water). Based on the chemical and isotopic compositions of the thermal waters, we calculated the Cl concentration and temperature of the NaCl-type thermal water as being approximately 20,000 mg/L and ∼280 °C, respectively. Our calculation of the supply rate of the NaCl-type thermal water indicates that large amounts of the NaCl-type thermal water are in continuous supply when volcanic activity increases prior to a magmatic eruption. In this area, the recent monitoring results reveal that the changes in the Cl concentration and seismic activity show a relatively good correlation, indicating that at least some of the volcanic earthquakes are related to the migration of the NaCl-type thermal water. Thus, when volcanic activity increases before a future magmatic eruption, chemical changes in the thermal waters in the Fukiage spa area should be apparent and the changes are likely to occur together with seismic activity. Our results propose that it is possible to interpret the present state of an active volcano more precisely through a comprehensive discussion of geochemical data from the thermal waters along with the other observations." @default.
- W2982337571 created "2019-11-08" @default.
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- W2982337571 date "2019-12-01" @default.
- W2982337571 modified "2023-10-16" @default.
- W2982337571 title "The interaction of volcanic gas and deep magmatic fluid with shallow aquifers at Tokachidake volcano, Japan" @default.
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- W2982337571 doi "https://doi.org/10.1016/j.jvolgeores.2019.106678" @default.
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