TOKYO - Tsunami reached Japan late Saturday through early Sunday, and waves as high as three meters were possible, the Japan Meteorological Agency said, hours after a massive volcanic eruption near Tonga.

The agency said a 1.2 metre (about four feet) tsunami reached the remote southern island of Amami Oshima around 11:55 pm (1455 GMT) Saturday before other areas along Japan's Pacific coast observed smaller tsunami.

The eastern shores of northernmost Hokkaido island as well as southwestern regions of Kochi and Wakayama also saw tsunami as high as 0.9 metres shortly after midnight, the agency said.

National broadcaster NHK switched to special programming and aired live footage from ports of affected regions, calling on area residents to evacuate to higher ground.

The footage showed no clear signs of abnormality, however.