UAV-based magnetic survey for detecting hydrothermal alteration zones relevant to landslides: A case study at Aso Volcano, Japan
Shigeo Okuma·Nobuo Matsushima·Daisaku Kawabata·Keiichi Sakaguchi·Tomoya Abe·Ayumu Miyakawa·Yoshinori Miyachi·Hikari Yonekura·Hideo Hoshizumi
Abstract We combined a regional aeromagnetic survey with an uncrewed aerial vehicle (UAV; drone)-based magnetic survey to map low-magnetization zones associated with intensive hydrothermal activity on the western flank of the central cones of Aso Volcano, Kyushu, Japan. Three-dimensional (3D) magnetic inversion of regional helicopter-borne data shows that the major fumarole and hot-spring areas: Yunotani, Yoshioka, and Jigoku–Tarutama, are characterized by magnetization lows. These lows coincide