Data are accessible for those recorded at these stations up to 1924. The file format is text (.day, .mon, .tdb). It will be downloaded automatically depending on the browser settings, so please be careful.

*The numbers of the tide stations denote the order of the accompanying stone marker.
No. | Tide station | Daily mean sea level | Monthly mean sea level | Annual mean sea level | |||
1 | Ayukawa | 1894-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1894-1924 | 1894-1924 |
2 | Kushimoto | 1894-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1894-1924 | 1894-1924 |
3 | Fukahori | 1894-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1894-1924 | 1894-1924 |
4 | Sotoura | 1894-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1894-1924 | 1894-1924 |
5 | Iwasaki | 1894-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1894-1924 | 1894-1924 |
6 | Hanasaki | 1896-1899 | 1900-1909 | 1910-1919 | 1920-1924 | 1896-1924 | 1896-1924 |

*The numbers of the tide stations denote the order of the accompanying stone marker.
No. | Tide station | Latitude | Longitude | Type of tide gauge | Tide datum plane | Height of the fixed point | Year of establishment | Map |
1 | Ayukawa | 38-18N | 141-30E | Kelvin | 5.000m | --- | June 1901 | Click here |
2 | Kushimoto | 33-28N | 135-47E | Kelvin | 6.000m | --- | May 1895 | Click here |
3 | Fukahori | 32-41N | 129-49E | Kelvin | 5.000m | --- | Apr. 1895 | Click here |
4 | Sotoura | 34-54N | 132-05E | Kelvin | 4.000m | --- | July 1895 | Click here |
5 | Iwasaki | 40-35N | 139-55E | Kelvin | 5.000m | --- | Sep. 1896 | Click here |
6 | Hanasaki | 43-17N | 145-35E | Kelvin | 5.000m | --- | Nov. 1895 | Click here |
- The values of latitude, longitude and altitude are the values recorded at that time.
- Method for calculating tidal height: Tidal height = height of the fixed point - constant of the tide datum plane + tide level