A tsunami wave of 1-3 meters (3-10 feet) is possible, according to the agency. The US Geological Survey put the magnitude at 6.9, striking 37 kilometers (23 miles) east-southeast of Namie off the country's east coast at a depth of 11.4 kilometers (7 miles).
Two aftershocks were reported by USGS, one 5.4 and one 4.8.
A tsunami wave has already been spotted 22 kilometers off the coast of Iwaki City in Fukushima Prefecture, CNN affiliate NHK reported. Images of the port showed waves that the broadcaster described as "backwash" that happens before a tsunami hits shore.
The Japanese public broadcaster urged the public to evacuate, reminding people to dress warmly and help others flee.
"Please do not think that you are safe. Please evacuate to high grounds," the network said. "Please think about the worst-case scenario and evacuate right away."
Alerta Maxima por terremoto causado hace unas horas en Japon, Se espera la llegada de Tsunami - Ola Gigante
Ver En vivo transmision TV
{[['']]}