Japan 'megaquake' advisory after tremor injures eight

Japan's earthquake scientists have warned of the possibility of a coming "megaquake" after eight people were injured Thursday by one of magnitude 7.1 in the south.

"The likelihood of a new major earthquake is higher than normal, but this is not an indication that a major earthquake will definitely occur," the Japan Meteorological Agency (JMA) said.

It was the first advisory issued under a new system drawn up following a major quake in 2011.

A government spokesman declined to comment on a report by broadcaster NHK that Prime Minister Fumio Kishida will cancel a trip to Central Asia from Friday following the warning.

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Traffic lights and cars shook and dishes fell off shelves during Thursday's tremor off the southern island of Kyushu, but no serious damage was reported.

The Fire and Disaster Management Agency said eight people were hurt -- including several hit by falling objects.

Sitting on top of four major tectonic plates, the Japanese archipelago of 125 million people sees some 1,500 quakes every year, most of them minor.

Even with larger tremors the impact is generally contained thanks to advanced building techniques and well-practised emergency procedures.

The government has previously said a megaquake has a roughly 70 percent probability of striking within the next 30 years.

It could affect a large swath of the Pacific coastline of Japan and threaten an estimated 300,000 lives in the worst-case scenario, experts say.

"While earthquake prediction is impossible, the occurrence of one earthquake usually does raise the likelihood of another," experts from Earthquake Insights said.

But they added that even when the risk of a second earthquake is elevated, it is "still always low".