An overview of the eruptions of Oshima Volcano, Izu, 1986-1987 from the geomagnetic and geoelectric standpoints.

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After 12 years' quiescence, Oshima Volcano, Izu, Japan (Izu-Oshima Volcano) entered an active period by eruptions from the central cone on November 15, 1986. There were three stages in the volcanic activity. The first stage was a period when the volcano repeated Strombolian type eruptions from its central cone. The second stage was characterized by fissure eruptions extending outside the caldera rim, and the third stage is the recovery phase. It is here attempted to review the changes in volcanic activity from the geomagnetic and geoelectric points of view.