[SEM20-05] Global electrical conductivity model of Miyake-jima: insights into its hydrothermal and magmatic system
Keywords:Hydrothermal system, Magnetotellurics, Miyake-jima, Electrical conductivity, Volcano
Here, we present the electrical conductivity model of the Miyake-jima volcano obtained from 13 broadband magnetotelluric stations deployed in 2012. We reveal a sharp contrast between the resistive vadose-zone and its underlying conductive hydrothermal system. By combining the electrical conductivity model with hypocenters distributions, surface temperature and CO2 surveys, we highlight the shallow plumbing system of the volcano: deep magmatic fluids rise through a narrow path, interact with the hydrothermal system before being finally released in the main fumarolic area inside the caldera.