A strong, 6.3 magnitude earthquake has struck southeast of Tokyo , the US Geological Survey says.
It was initially recorded as having a magnitude of 6.4 but has since been downgraded slightly.
The quake's epicentre was 232km southeast of the Japanese capital at a shallow depth of 10km.
It struck at 09:14am local time (12:14pm NZT).
No Tsunami warning has been issued by the Pacific Tsunami Warning Centre.
Japan's Meteorological Agency says "although there may be slight sea-level changes in coastal regions, this earthquake has caused no damage to Japan."
(U.S Geological Survey)
Two strong aftershocks have also rattled the region measuring magnitude 4.5 and 4.9.