Japan was hit by a powerful earthquake for the second straight day today, though there were no immediate reports of injuries or damage, officials said.
There was no danger of tsunami the Japan Meteorological Agency said.
The crippled Fukushima Daiichi nuclear power plant, battered by a huge 2011 quake- generated tsunami and which is currently being decommissioned, has shown no irregularities in radiation levels following the jolt of yesterday, officials said.
Japan encounters a number of comparatively violent quakes every year and sits at the junction of four tectonic plates, but their strict enforcement and firm building codes mean strong tremors usually do little damage.
But the enormous undersea quake that strike in March 2011 sent a tsunami barreling into the northeast shore of Japan, leaving more than 18,000 individuals dead or lost, and sending three reactors into meltdown.