Thermal structure beneath Kuju volcano, central Kyushu, Japan

Abstract

Abstract Thermal conditions beneath Kuju volcano, central Kyushu, Japan are simulated in two manners. Simulation of the regional high heat flow around Kuju volcano shows that the underlying magma reservoir is not molten but maintains high temperatures of 400–700°C. Simulation of the thermal processes beneath the solfatara field in the central part of Kuju volcano suggests that the geothermal reservoir is a two-phase reservoir heated by magmatic steam.