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Japan 'megaquake' advisory after tremor injures eight

"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.

AFP
Tokyo, Japan
Fri, August 9, 2024 Published on Aug. 9, 2024 Published on 2024-08-09T10:44:10+07:00

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Japan 'megaquake' advisory after tremor injures eight Workers look at a closed off section of the national highway after rocks fell across the road when a 6.3 magnitude earthquake hit southern Japan late the night before, in the city of Ozu, Ehime prefecture on April 18, 2024. (AFP/Jiji Press)

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apan'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.

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".

On January 1, a 7.6-sized jolt and powerful aftershocks hit the Noto Peninsula on the Sea of Japan coast, killing at least 318 people, toppling buildings and knocking out roads.

In 2011, a mammoth 9.0-magnitude undersea quake off northeastern Japan triggered a tsunami that left around 18,500 people dead or missing.

It sent three reactors into meltdown at the Fukushima nuclear plant, causing Japan's worst post-war disaster and the most serious nuclear accident since Chernobyl.

A future megaquake could emanate from the vast Nankai Trough off eastern Japan that in the past has seen major jolts, often in pairs, with magnitudes of eight and even nine.

This included in 1707 -- until 2011 the largest recorded -- when Mount Fuji last erupted, in 1854, and then a pair in 1944 and 1946.

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