The Generic Mapping Tools (GMT, Wessel and Smith, Eos, 79, 579, 1998) was used to make the figure of the epicenter,
which is from JMA (https://www.data.jma.go.jp/svd/eqev/data/daily_map/20211007.html). The land topography and ocean bathymetry are from GEBCO Compilation Group (2020, GEBCO 2020 Grid, doi:10.5285/a29c5465-b138-234d-e053-6c86abc040b9).