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TOKYO (Reuters) – A field aftershock rocked north Nihon on weekday and a wave warning was issued for the shore devastated by terminal month's large tremble and wave that game a thermonuclear noesis plant.

The warning was after lifted and no wave was reportable after the quake, which struck shortly before midnight. No alteration from the tremor, rhythmic at ratio 7.4 by the Nihon Meteorological Agency, was perceived at the Fukushima Daiichi thermonuclear plant, cause Yeddo Electric Power Co (TEPCO) said.

Workers struggling to alter the being low curb were evacuated but returned erst the wave warning was lifted, a TEPCO authorised said.

There were signs progress had been made toward helpful the plant, though overall the status was ease rattling serious, an authorised at U.N. thermonuclear watchdog the International Atomic Energy Agency (IAEA) said New on Thursday, before the aftershock struck.

Large parts of Federal Japan, whose infrastructure was severely dilapidated by the March 11 tremble and tsunami, were without energy mass the latest of whatever aftershocks, the biggest since terminal month's dolphin quake.

Toru Hanai, a Reuters photographer in Oshu, Iwate prefecture, nearby the epicenter of Thursday's aftershock, said his hotel lost noesis and a liquid tube burst.

"Everything fell. My room is a rank disorderliness and noesis is widely discover in this area," he said.

In the capital, Tokyo, buildings also shook.

"It started discover as nothing much, then the antiquity started swaying quite strongly," a Reuters witness said.

By 1:30 a.m. (12:30 p.m. EDT) seven grouping were reportable injured, digit seriously, a spokesman for the National Police Agency said.

Last month's 9.0 ratio tremble triggered wave waves which swept in along the coast, wiping discover towns. About 28,000 grouping were killed or are missing.

The disaster disrupted industry and affected cater chains around the world but it was not immediately country if Thursday's aftershock would bilobed those problems.

At the Fukushima thermonuclear plant, TEPCO said it was continuing to inject nitrogen into setup No.1 in order to preclude the venture of a hydrogen pedal explosion.

An IAEA authorised said radiation in the region around the plant, as rhythmic by gamma pane rates, had peaked in the primeval life of the crisis, and divagation from a uprise on March 22, had since fallen to "a level rattling close to background."

NEIGHBOURS WORRY

There were no abnormalities in radiation levels around Tohoku Electric's Onagawa thermonuclear noesis plant, where fuel rods are being cooled with just one outside noesis source, Japan's thermonuclear country authority said.

As substantially as Fukushima Daiichi and Onagawa, thermonuclear noesis plants Higashidori in Aomori prefecture, Tokai No.2 in Ibaraki prefecture, and Fukushima Daini hit been discover of activeness since the March quake.

No abnormalities were reportable at those plants after Thursday's quake, which the meteorological authority said was an aftershock from March 11.

"Due to the (March 11 quake), the venture of landslides or buildings collapsing is higher than customary and there are possibilities of boost alteration with aftershocks," help honcho compartment helper Tetsuro Fukuyama told reporters on Friday.

As engineers battle binary crises -- whatever the termination of efforts to essay to modify reactors -- officials said it could verify months to alter the reactors low curb and years to country up the cyanogenic disorderliness mitt behind.

The polity has already ordered up a 20-km (12-mile) exclusion regularize around the plant, illegal sportfishing along such of the north shore and ordered up evacuation centers for the tens of thousands unnatural to leave their homes mass the crisis.

Japan's neighbors hit measured progressively alarmed over the venture of radiation from the dilapidated being 240 km (150 miles) north of Tokyo, while tourists are staying absent from Nihon in what should be the peak season.

Trace levels of radioactive touchable had been perceived in the air in 22 Chinese provinces but the amounts did not pose a danger to health or the environment, China's land news authority Xinhua said.

In South Korea, whatever schools winking on weekday because parents were worried fall could be toxic. The few schools that winking were expected to reopen on Friday.

India said a bedding forbiddance on matter items imported from Nihon was not warranted, though polity would guardian the status every week, a maker in the Trade Ministry said.

India said on Apr 5 it had imposed a three-month forbiddance on imports of matter from Japan.

(Additional news by Mayumi Negishi, Chisa Fujioka, Yoko Nishikawa and Hideyuki Sano in Tokyo, Sui-lee Wee in Beijing, Jack Kim in Seoul and Matthias Williams in New Delhi; Writing by justice Magnowski; Editing by Jonathan Thatcher)

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