Earthquake of 6.1 magnitude hits Japan a week after 7.7 massive earthquake

A preliminary magnitude 6.1 earthquake struck northern Japan early Monday, the US Geological Survey reported. The quake struck 18 kilometres west of the small town of Sarabetsu in Hokkaido at a depth of 81 kilometres, according to the USGS. The latest tremor comes just a week after a stronger 7.7 magnitude earthquake struck off northern Japan, triggering a tsunami alert.