[SCG53-P16] Electrical resistivity structure around the long-term Slow Slip Events beneath the Bungo Channel region, southwest Japan, by three-dimensional wideband magnetotelluric inversion
Keywords:Resistivity Structure, Slow Slip Event, Bungo Channel
Using obtained MT responses, we constructed a three-dimensional resistivity model around the SSE region. We inverted the impedance tensor and the vertical magnetic transfer function by the “femtic” inversion code developed by Usui (2015). The “femtic” inversion code employs the edge-based finite element method for unstructured tetrahedral elements and estimates the subsurface resistivity structure and the distortion tensor for each observation site. The main features of the obtained three-dimensional model are 1) a moderate conductive zone in the central part of SSEs 2) whose trenchward extension shows more conductive and 3) conductive zone surrounding the SSEs regions. These results suggest that the lateral electrical heterogeneity could have controlled the slip distributions of SSEs along the upper boundary of the Philippine Sea slab.