Office workers in Yokohama have narrowly escaped harm by falling debris after a massive earthquake rocked Japan.

Footage shows people running to the centre of the road in order to avoid the debris falling from high rise buildings.

The quake is the most powerful to hit Japan since records began. The tremor, measured at 8.9 by the US Geological Survey, hit at 1446 local time (0546 GMT) at a depth of about 24km.