The announcement was made as tens of thousands of people bowed their heads in silence at 2: 46 exactly one month since the earthquake of magnitude 9.0, the tsunami that followed was destruction of the northeast coast of the Japan.
Mourning is punctuated by another strong aftershock near the coast Pacific of Japan, which briefly to trigger a tsunami warning, killed at least one person and knocked out the Fukushima Daiichi nuclear power Station cooling severely damaged during almost an hourwhich underlines the vulnerability of the reactors to continue seismic activity.
Tuesday morning, there was an another strong aftershock that struck Tokyo. The authorities have already ordered people living within a radius of 12 miles from the plant to evacuate and has recommended that people stay indoors or avoid an area within a radius of 18 miles.
The Government's decision to extend the zone came in response to high readings of radiation in some communities beyond these areas, noting how difficult was to predict the ways radiation extends from the damaged plant.
Unlike the previous definitions of the areas to be evacuated, this time the Government has designated specific communities that need to be evacuated, instead of a RADIUS in miles.
The radiation was not distributed uniformly reactors, but rather was realized in some areas and not others by weather and terrain. Iitate, one of the communities a dire Monday to prepare for evacuation, lies beyond the 18 mile radius, but the winds in the last month have tended to blow the Fukushima plant Northwest towards Iitate, which may explain why high readings were detected there.
Yukio Edano, Secretary to cabinet head of Government, said that the Government would order Iitate and four other towns and villages to prepare to evacuate.
Officials are concerned that people in these communities are exposed to radiation equivalent to at least 20 millisieverts, a year he said, which can be harmful to human health in the long term. Evacuation orders will come less than a month of Katsurao, Namie, the Iitate and Minamisoma and Kawamata regions, said Mr. Edano.
People in five other areas can also be said to evacuate if conditions at the Fukushima Daiichi plant grow worse, said Mr. Edano. These areas are Naraha, Hirono, Kawauchi, Tamura and other sections of Minamisoma.
"This measure is not an order so that you can evacuate or take immediate action, said." We arrived at this decision taking into account the risks remain in the region in the long term. "He appealed for calm and said that the chance of a leak of radiation on a large scale of the Fukushima Daiichi plant had, in fact, decreased.
Mr. Edano said also that women pregnant, children and patients of the hospital should remain outside the area of the 19 miles of reactors and that schools in this area remains closed.
So far, the Japanese Government had refused to extend the evacuation zone, despite the insistence of the International Atomic Energy Agency. The United States and the Australia have advised their citizens to stay at least 50 kilometres of the plant.
The international agency, which is based in Vienna, said Sunday that his team had measured radiation 0.4 to 3.7 microsieverts per hour Saturday at a distance of 20 to 40 miles from the plant damaged - well outside the area of initial evacuation. At this rate of accumulation, should be 225 days to 5.7 years to reach the threshold of the Japanese Government for evacuations: radiation accumulating at a rate of at least 20 millisieverts per year.
In other words, that the areas with higher readings would qualify for evacuation again ordered by the Government.
But the Soviet Union used a lower threshold - five millisieverts per year - finally offering resettlement to people living near the reactors at Chernobyl in 1986.
Moshe Komata and Kantaro Suzuki contributed reporting.
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