A strong 5.6 magnitude quake shook buildings in Japan's capital city Tokyo and surrounding areas on Monday, but no immediate damage or injuries were reported and no tsunami warning was issued.
Local media reported that the city's train lines were halted briefly during the earthquake, which was measured as being 5.3 on the Richter scale by the US Geological Survey, and some airports closed runways as a precaution for a short period.
The quake was centred in Ibaraki prefecture just northeast of Tokyo.
No nuclear power stations have been reported affected by the latest quake.
Japan is located at the intersection of a number of the earth’s tectonic plates and is one of the country’s in the world with the most seismic activity. A massive earthquake and tsunami in 2011 left nearly 20,000 people dead and led to meltdowns at the Fukushima Daiichi nuclear plant.