5.8-magnitude quake strikes off Japan, no tsunami alert

TOKYO - An offshore quake struck 140 kilometres northeast of Tokyo Monday morning, shaking tall buildings in Japan's capital, but authorities did not issue a tsunami alert.

There were no immediate reports of damage or casualties.

The quake off coastal Ibaraki prefecture - one of many aftershocks since Friday's massive 8.9 quake - had a 5.8-magnitude, said the US Geological Survey, which said the quake struck at a depth of 18 kilometres.