The hydrogeologic and geohydrologic studies of volcanoes and volcanic islands in Japan are carried on by the author and his collaborators by field geologic, geophysical and geochemical exploration survey methods, test drilling, and aquifer tests. The main purpose of these studies is to find groundwater resources at an altitude higher than the spring zone of volcanoes.

Stress is laid on two points: (1) to establish a simulated grid drilling program that deals with the groundwater valley, and (2) to clarify relation between

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the occurrence of springs and character of volcanic rock.

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