Fig.2-22 (c) Geological columns and Hexadiagram
This figure shows hexadiagrams of groundwater chemistries. The distribution of groundwater chemistries changes from the fresh water system (Na-HCO3 type) to saline water system (Na-Cl type) with the depth.
(d) Estimated pattern by inverse-distance interpolation of water samples
3-D distributions of groundwater chemistries were estimated by using a geostatistical method (inverse- distance interpolation method) based on the borehole location and sampling depth. As a result, the zone at the east side of Omagari fault has a low concentration of chloride ion (Cl-), down to deep levels.
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