Tsunami alert issued in Japan following 5.6-magnitude earthquake
File photo.
A smalltsunamiwas observed on the remote Japanese island of Hachijojima on Tuesday, the weather agency said, after a 5.6-magnitude earthquake struck near the Izu Islands chain.
Waves of 50 centimetres (20 inches) hit Hachijojima at around 9 am (0000 GMT), after the Japan Meteorological Agency issued atsunamialert for the region south of Tokyo.
The smalltsunamiwas observed around 45 minutes after the earthquake, which the United States Geological Survey said had a shallow depth of 11.7 kilometres (seven miles).
On Miyakejima Island, an even smallertsunamiwave of 10 centimetres was measured, the JMA said.
Around 25,000 people live on small Pacific islands south of Tokyo.
Some residents told national broadcaster NHK that they did not feel the earthquake, and there were no immediate reports of damage.
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The JMA said Japan's vast Pacific coastline from Chiba near Tokyo to Okinawa near Taiwan may also observe slight changes to the ocean surface following the earthquake.
Japan sits on four major tectonic plates and experiences around 1,500 quakes every year, most of them minor.
The impact is generally contained even with larger tremors thanks to advanced building techniques and well-practised emergency procedures.
But a potential mega-quake with an estimated magnitude of 8-9 hasa roughly 70 percent probability of striking within the next 30 years, the government says.
It could affect a large swath of the Pacific coastline and threaten an estimated 300,000 lives in the worst-case scenario, experts say.
In 2011, a colossal 9.0-magnitude undersea quake off northeastern Japan triggered atsunamithat 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.
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