Correction: Earth, Planets and Space (2021) 73:41 https://doi.org/10.1186/s40623-021-01370-y
Following publication of the original article (Hori et al. 2021), the authors found that the red lines in Fig. 4, which denote the location of seismic velocity profiles in Fig. 2, is not plotted precisely. They newly plotted the lines that denote the locations of the profiles at the correct locations in the revised version of Fig. 4. The caption of the figure was also revised accordingly. The change of the results does not affect the discussion in the main text.
The correct Fig. 4 has been provided in this Correction.
The original article (Hori et al. 2021) has been corrected.