Imaging the Hydrothermal System of Kirishima Volcanic Complex, Japan with L-band InSAR Time Series

Abstract

Shinmoe-dake hydrothermal system deflated during the 2008-2010 eruptions, then was replaced by a magmatic body during the 2011 eruption.• Persistent inflation at the Iwo-yama crater during 2014-2019 is driven by liquid-gas twophase water boiling.• Precursory expansion of Iwo-yama's southern and western vents after December 2017 is driven by the upward migration of magmatic fluid.