5.8-magnitude quake strikes off Japan, no tsunami alert

5.8-magnitude quake strikes off Japan, no 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.