A massive 8.9-magnitude earthquake hit Japan on Friday, unleashing a 10-metre high tsunami that did extensive damage. One person is confirmed dead but the toll is expected to rise steeply.
A tsunami warning is in place for Japan, Russia, Marcus Island, the Northern Mariana Islands, Taiwan, Guam, and Wake Island.
A tsunami watch is in place for Yap, Philippines, Marshall Islands, Belau, Midway Islands, Pohnpei, Chuuk, Kosrae, Indonesia, Guam, Papua New Guinea, Nauru, Johnston Island, Solomon Islands, Kiribati and Hawaii.
Australians in affected areas should monitor the media for information, the Department of Foreign Affairs and Trade said.
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"Australians should follow the instructions of local authorities.
"Australians in affected areas who require consular assistance should contact the Department of Foreign Affairs and Trade on +61 2 6261 3305."
Australians concerned for family or friends in affected areas should first try to contact them directly, DFAT said.
"If they are unable to be contacted or you should hold fears for their safety, you can call DFAT on +1300 555 135."
The United States has placed its west coast and Hawaii on tsunami watch. Prime Minister Julia Gillard is due to visit Hawaii on Saturday.
