Japan’s meteorological agency lifted its tsunami warnings on Friday after a magnitude 7.3 earthquake hit the Pacific Ocean just off the coast of north-eastern Japan.

It triggered a one-metre tsunami in an area devastated by last year’s Fukushima disaster, but there were no reports of deaths or serious damage and Japan’s meteorological agency gave the all-clear.   

“We announced a tsunami warning in Miyagi prefecture, the coast of Aomori prefecture facing the Pacific Ocean, Iwate prefecture, Fukushima prefecture and Ibaraki prefecture but we have lifted all warnings as of 1920 hours (1020 GMT),” said Akira Nagai from the Japan Meteorological Agency.

 Japan is one of the world’s most earthquake-prone countries, with a tremor occurring at least every five minutes.

The March 2011 earthquake and following tsunami killed nearly 20,000 people and triggered the world’s worst nuclear crisis in 25 years when the Fukushima-Daiichi nuclear plant was destroyed, leaking radiation into the sea and air.

The disaster has made people more sensitive to the risks tsunami’s pose and the meteorological agency told people not to let down their guard. 

“We urge caution for these regions as we think a tsunami large enough to cause a change on the surface of the water will come within half a day,” Nagai said.

Located in the “Ring of Fire” arc of volcanoes and oceanic trenches partly encircling the Pacific Basin, the country accounts for about 20 percent of the world’s earthquakes of magnitude 6.0 or greater.

Tokyo, with a population of 12 million, sits on the junction of four tectonic plates: the Eurasian, North American, Philippine and Pacific.

The sudden bending or breaking of any plate can trigger an earthquake.