Dense magnetotelluric imaging of the Akan Caldera (Hokkaido, Japan): insights into its magma plumbing system and caldera-forming reservoir
Joint press release (in Japanese) by Hokkaido University, Kyusyu University, Nagoya University
Abstract
To investigate the magma plumbing system beneath the Akan Caldera (Hokkaido, Japan), we conducted broadband magnetotelluric surveys and imaged its three-dimensional resistivity structure to a depth of approximately 30 km. The caldera hosts post-caldera volcanoes, including Mt. Meakandake and Mt. Oakandake, which have recently shown ground inflation and heightened deep low-frequency seismicity. Our main finding is a prominent, westward-dipping conductive column beneath the caldera. This conductor is interpreted as the magma plumbing system of the Akan Caldera, comprising three distinct components, for which we estimated volumes based on the spatial extent of the conductive region: (1) the volatile-rich zone ……
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Article Information:
Inoue, T., Hashimoto, T., Aizawa, K. et al. Dense magnetotelluric imaging of the Akan Caldera (Hokkaido, Japan): insights into its magma plumbing system and caldera-forming reservoir. Earth Planets Space (2026).
DOI: https://doi.org/10.1186/s40623-026-02398-8
