Southern Japan was rocked by a 6.6 magnitude earthquake, prompting safety warnings.The tremor caused widespread shaking but no major damage has been reported yet.

The earthquake has been far from the strongest ... Compare this to the two atomic bombs that went off in Hiroshima and Nagasaki in 1945, which collectively claimed around 105,000 lives in total.

A 6.8-magnitude earthquake struck south-western Japan late on Jan 13, causing two small tsunamis in the area, but no damage was reported.