伊豆大島の地下水水質の地球化学的観測

概要

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Periodic observations were carried out for chemical compositions of water samples from springs and boreholes (13 observation sites) in Izu Oshima Island at intervals of about a month just before and after the 1986 eruption of Izu Oshima volcano. Based on periodic observations, the influences of the Izu Oshima volcanic activity on the subsurface water system and on its chemical compositions are summarized as follows. (1) The change in flow path of subsurface water by the ascent of the magma. (2) The intrusion of magmatic emanations such as carbon dioxide into subsurface water layer followed by the water-rock interaction. (3) Sea water intrusion and disturbance of stratification of subsurface water consequent on the ground crack formation and the heat supply from the magma (magmatic emanations). (4) Dilution of subsurface water with meteoric water because of the stop of drawing water during the period of the evacuation (flight) of habitants from the island.
特定非営利活動法人日本火山学会の論文
1988-06-30