Correction to: Earth, Planets and Space (2017) 69:112 DOI 10.1186/s40623-017-0698-z

After publication of this work (Fukushima et al. 2017) some errors were noticed. In Figures 2b, 2c and 2f the letters ‘N’, ‘N’ and ‘S’ appear in the images, respectively.

The original article was corrected.

The publisher apologises for these errors.