A 5.1 magnitude earthquake has rocked Tokyo, but there were no immediate reports of injuries or damage.
The quake struck at 4.49pm Tokyo time (8.49am Irish time), with its epicentre located off the Pacific coast some 170kms northeast of Tokyo.
Its focus was about 50kms below the seabed.
The quake was strong enough to briefly shake buildings in Tokyo.
Japan experiences 20% of the world's major earthquakes. A powerful quake in the northern prefecture of Miyagi on 13 June triggered landslides and killed 12 people.
