Foreign Affairs Minister Kevin Rudd says the Government has confirmed all Australians registered as being in the disaster-affected areas of Japan are now safe.

Last week, the Government said it was concerned about more than 140 people who were in parts of Japan hit by the March 11 earthquake and tsunami.

Mr Rudd says consular staff have been working around the clock to find all Australians who were registered as being in the disaster zone.

"We've just been advised by the crisis centre of the Department of Foreign Affairs, that they've now contacted or otherwise confirmed the safety of all those who we had on our 'unaccounted for in affected area' list in Japan," he said.

"It's possible that more names may emerge as a result of further work by the consular team, or further information coming to hand by family and friends, but in terms of the current unaccounted for list that number has now, by officials, been reduced to zero," Mr Rudd said.

Australia is donating $10 million to support the country's earthquake and tsunami victims.

Prime Minister Julia Gillard announced the money will go to the Red Cross's Japan and Pacific disaster appeal.

Earlier today, Ms Gillard and Opposition Leader Tony Abbott signed a condolence book at the Japanese embassy in Canberra.

The number of people confirmed dead or listed as missing in Japan is nearing 22,000, 10 days after the massive earthquake and tsunami struck the country's north-east coast.

But fears persist of a far higher death toll.

The national police agency says 8,649 people have been confirmed dead and 13,262 are officially listed as missing - a total of 21,911 - as of Monday.

Miyagi prefecture was worst hit, with a confirmed death toll of 5,244.

But Miyagi police chief Naoto Takeuchi told a Sunday task force meeting that the prefecture alone "will need to secure facilities to keep the bodies of more than 15,000 people," Jiji Press reported.

The quake has become Japan's deadliest natural disaster since the 1923 Great Kanto Earthquake, which killed more than 142,000 people.

- ABC/AFP