Changes in the electrical resistivity of the central cone, Miharayama, of Oshima Volcano observed by a direct current method

Abstract

The electrical resistivity of Oshima Volcano has been repeatedly measured using bipole-bipole electrode arrangements across the central cone, Mihara-yama. Apparent resistivities obtained by three different pairs of electrodes varied according to the vicissitudes of the volcanic activity. Changes associated with the eruption on November 15, 1986, were particularly remarkable. These changes are quantified and causative phenomena discussed. -after Authors