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The Quaternary volcanoes and its terrain are one of the excellent water resources and generally more abundant in groundwater than other area, because of excellent aquifers made of volcanic materials, such as lava flow and fall deposits. However, the mechanism of groundwater flow system and storage process have complex mode, which reflected the geological settings and volcanic history. In Mt. Fuji, the previous works have done from various points of view concerning the recharge in hydrological cycle and water balance in the groundwater basin, in which include the volcanic edifice and lake of the volcano foot, such as the hydrological works of Yamamoto (1970; 1995) and the hydrogeological research of Miyamoto (1968). After then, the some researches of water quality and the isotope chemistry for groundwater flow system have been carried out.
Meanwhile, the history of volcanic activity on Mount Fuji, detail previous works by Tsuya (1968), Miyaji (1988) and Uesugi et al (1992), have been carried, but there are the many unresolved problems on volcanic activity associated with the origins of lake in the piedmont area and timing of the formation. After AD 2000, according to making pronounced advances in research of the volcanic disaster prevention on Fuji volcano, the Quaternary stratigraphy and subsurface geological settings of piedmont area of Mount Fuji are made more clearly. And also our institute has collaborated with NIED on research, so as volcanic earthquakes and ground deformation, related to volcanic activities of Fuji volcano. We too have monitored a variation of temperature, pH and electric conductivity of groundwater.
We illustrate the outline of groundwater flow system and hydrogeological structure in the northern piedmont area of Fuji volcano, based on the Quaternary geology and tephro-stratigraphy.
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