P-wave anisotropy tomography of central Japan: Insight into subduction dynamics

► P-wave anisotropic tomography was determined under central Japan. ► The central portion of the mantle wedge is relatively isotropic. ► Fast-velocity directions are generally in a trench-parallel and trench-normal pattern. ► The fossil anisotropy of the Philippine Sea plate may be preserved. ► The fossil anisotropy of the upper portion of the Pacific slab may be rebuilt.