[S-TT40] Airborne surveys and monitoring of the Earth

[STT40-02] Comprehensive aeromagnetic survey by uncrewed helicopter in Shinmoedake volcano, Japan, remotely controlled via satellite

*Takao Koyama¹, Takayuki Kaneko¹, Takao Ohminato¹, Atsushi Watanabe¹, Yohei Yukutake¹, Yoshiaki HONDA² (1.Earthquake Research Institute, The University of Tokyo, 2.Center for Environmental Remote Sensing, Chiba University)

Keywords:aeromagnetic survey, Shinmoedake, uncrewed helicopter

We repeatedly conducted aeromagnetic surveys at Shinmoe-dake volcano, Japan by using an uncrewed helicopter, and elucidate magnetization structure and its temporal change. At the beginning of 2011, Shinmoe-dake volcano had magmatic eruptions. After ceasing activities of volcanic eruptions, we conducted repeated surveys, and notable temporal changes are detected just around the crater of Shinmoe-dake volcano by gaining magnetization due to cooling of lava which has accumulated in the crater at the 2011 eruptions. The cooling rate just follows the square root of elapsed time from the eruption, and thus the cooling is being simply done by thermal diffusion.
Our previous surveys, however, have been done only on the western side of Shinmoe-dake volcano, because we cannot access to the eastern side of the volcano nor telecommunicate with the helicopter from the home point at a common western side if it flies in the opposite side. Recently, the remotely control system of the helicopter via a satellite was developed and it overcame the difficulties. By using this system, we conducted a comprehensive aeromagnetic survey on both the eastern and western side in 2021, as the helicopter was controlled from Hamamatsu, Shizuoka: 700 km away from the volcano.
In this paper, we show the control system and the result of the aeromagnetic survey in Shinmoedake volcano.