(2)自然電位から推定される火山地域の地下流体流動(第2部室内岩石実験による電磁波放射特性に関する研究)

概要

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Self-potential (SP) surveys of Izu-Oshima volcano were carried out three times during two years from 1989 to 1991. SP anomaly of positive polarity (about 300 mV in amplitude and 3 km in spatial extent) was found to overlie the areas surrounding the summit crater of Mt Mihara. On the basis of electrokinetic mechanisms for source-free fluid flow, the depth and the strength of a current source are estimated for the observed anomaly. Positive charge carried by the hot water upflow from depth is probably accumulated around a zone where separation between the vapor and the liquid phases occurs. We infer subsurface hydrology from SP data : evaluating parameters such as the rate of upflow below the crater.
独立行政法人防災科学技術研究所の論文
1993-03-29