Reconstructing surface eruptive sequence of 2018 small phreatic eruption of Iwo-yama volcano, Kirishima Volcanic Complex, Japan, by infrasound cross-correlation analysis

Abstract The Iwo-yama volcano of the Kirishima Volcanic Complex in Japan had a small phreatic eruption April 2018, which newly formed multiple vents. activity was recorded by two infrasound sensors and monitoring cameras, been installed within 1 km This study identified infrasonic signals from vents cross-correlation analysis between sensors. successfully revealed main craters constrained onsets at individual craters. We combined results with images cameras reconstructed sequence Iwo-yama. At each craters, intense eruption, depicted evident signals, occurred several hours after onset. provides activities will be useful for understanding hazard assessments.