A powerful 7.6-magnitude earthquake shook northeastern Japan late on Monday, prompting tsunami warnings and orders for about 90,000 residents to evacuate.

The Japan Meteorological Agency (JMA) said a tsunami as high as 3 metres (10 feet) could hit Japan's northeastern coast after the earthquake struck off the coast at 11:15 p.m. (1415 GMT).

Tsunami warnings were issued for the prefectures of Hokkaido, Aomori and Iwate, and tsunamis from 20 to 70 cm (7 to 27 inches) high were observed at several ports, JMA said.

The epicentre of the quake was 80 km (50 miles) off the coast of Aomori prefecture, at a depth of 50 km, the agency added.

On Japan's 1-7 scale of seismic intensity, the tremor registered as an "upper 6" in Aomori prefecture -- a quake strong enough to make it impossible to keep

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