[SVC44-P08] Hydrothermal system around the Iwo-yama fumarolic field in Kuju volcano (Japan) inferred from a 3-D resistivity structure model
Keywords:Resistivity structure, Hydorthermal system, Phreatic eruption
The AMT data were successfully collected at 25 locations around Iwo-yama from 2005 to 2008 and recently interpreted by a 3-D inversion (Usui, 2015). A thin conductive layer less than 100 m thick near the surface and an underlying resistive zone were found beneath Iwo-yama area, which is interpreted as a permeable zone saturated with vapor-rich fluids. The center of cooling zone inferred is located around the lower part of this less conductive zone, where the accumulation of groundwater and the vaporization of hydrothermal fluids are supposed to occur.