Fig. 1From: A broadband magnetotelluric survey for Mt. Meakandake volcano with special attention to the unrest during 2016–2017a Location of Akan Caldera in Hokkaido, Japan. b Location of the MT sites in this study. The red rectangle indicates the sill-like source model of the ground deformation during 2016 and 2017 (Faculty of Science, Hokkaido Univ 2019). The simplified geological map is adapted from the report by Satoh (1965)Back to article page