A strong 6.2-magnitude earthquake hit eastern Japan on Saturday, the US Geological Survey said, but there were no immediate reports of damage.
The quake, at a depth of 44 kilometres, struck shortly after 6:42 am local time near the northeast coast of the main Honshu island, some 350 kilometres from Tokyo.
No tsunami warning was issued.
Japan sits at the junction of four tectonic plates and experiences a number of relatively violent quakes every year, but rigid building codes and their strict enforcement mean even strong tremors often do little damage.
The quake, at a depth of 44 kilometres, struck shortly after 6:42 am local time near the northeast coast of the main Honshu island, some 350 kilometres from Tokyo.
No tsunami warning was issued.
Japan sits at the junction of four tectonic plates and experiences a number of relatively violent quakes every year, but rigid building codes and their strict enforcement mean even strong tremors often do little damage.