神戸市周辺の高温地下水異常と全炭酸の安定炭素同位体比

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  • High-temperature Anomaly of Groundwater and Stable Carbon Isotope Ratio of Total Carbonic Acid in and around Kobe City
  • コウベシ シュウヘン ノ コウオン チカスイ イジョウ ト ゼン タンサン ノ

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This paper outlines the water chemistry and stable carbon isotopes of water collected from Kobe city and an adjacent area where the so-called seismic damage belt appeared due to the Southern Hyogo Prefectural Earthquake of 1995. Based on the borehole data, a high-temperature anomaly of groundwater is recognized in Kobe and Amagasaki, trending in a northeast to southwest direction. This direction roughly coincides with that of active faults around the Rokko Mountains.<br> From the water chemistry, Cl ion and total CO2 are relatively rich in high-temperature groundwater, which resembles the typical features of hot water from the Arima Hot Springs about 10 km north of downtown Kobe. Furthermore, the values of the stable carbon isotope ratio (δ13C) indicate that the high-temperature groundwater contains carbonate originating from the hot water of deeper aquifers. It is inferred that a hot water reservoir underlies the Kobe area and that the high-temperature anomaly of groundwater is formed by a mixture of shallow groundwater and deep hot water ascending through unknown concealed faults.

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