UPDATE 7:05PM: The Australian government has acknowledged the magnitude 8.5 earthquake in Japan but says there is no tsunami risk to Australia at this time, contradicting the US government's warning.
The US government is warning Australians of a tsunami threat to Australian coastline.
A 10m tsunami has hit north-eastern Japan, with the Pacific Tsunami Warning Centre, operated by the US National Oceanic and Atmospheric Administration warning of a tsunami risk to a large number of countries, including Australia.
The countries under warning are Japan, Russia, Marcus Is., N. Marianas, Guam, Wake Is., Taiwan, Yap, Philippines, Marshall Is., Belau, Midway Is., Pohnpei, Chuuk, Kosrae, Indonesia, Papua New Guinea, Nauru, Johnston Is., Solomon Is., Kiribati, Howland-baker, Hawaii, Tuvalu, Palmyra Is., Vanuatu, Tokelau, Jarvis Is., Wallis-futuna, Samoa, American Samoa, Cook Islands, Niue, Australia, Fiji, New Caledonia, Tonga, Mexico, Kermadec is, Fr. Polynesia, New Zealand, Pitcairn, Guatemala, El Salvador, Costa Rica, Nicaragua, Antarctica, Panama, Honduras, Chile, Ecuador, Colombia, Peru.
At the time of writing, the Australian Government's Bureau of Meteorology Tsunami Warning website was not showing a current tsunami warning, however it was last updated at 5.16PM - prior to the Tokyo earthquake hitting.