Details of the Abstract
| Title of paper | Shallow thermal demagnetization beneath Tokachidake Volcano revealed by a UAV aeromagnetic survey |
| List of authors | Author, T. Hokari., Co-author, R. Tanaka., Co-author, T. Hashimoto., Co-author, T. Koyama. |
| Affiliation(s) | Graduate School of Science, Hokkaido University., Institute of Seismology and Volcanology, Hokkaido University., Institute of Seismology and Volcanology, Hokkaido University., Earthquake Research Institute, The University of Tokyo. |
| Summary | We estimated the distributions of three-dimensional magnetization intensity beneath the active crater area on Tokachidake Volcano. Our 3D model revealed a low magnetization region corresponding to the crater locations. This distribution was generally consistent with the location of the major fumarolic areas and the low resistivity zone imaged by the 3D inversion of audio-magnetotelluric data (Tanaka et al., 2021). These results suggest that the low magnetization region represents a possible hydrothermal pathway. In addition, another weakly magnetized region was found at an elevation of approximately 1,550 m a.s.l. on the NW side of the 62-II crater (most active crater). This region shows a good correspondence with the surface thermal anomaly on the NW slope. We planned a second observation for this summer, and we would like to discuss the thermal activity in the shallow subsurface of Tokachidake based on the magnetization structure’s changes. |
| Session Keyword | 6.0 Marine and airbone EM |
| File upload |
6.0_shallow_thermal_demagneti_hokari.pdf
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