Tsunami warning issued in Japan after major 7.5 magnitude quake

A magnitude 7.5 quake struck away the northeasterly coast of  nippon on mon, as authorities urged residents to stay away from coastal areas where tsunami waves of up to three metres were expected.

The biggest waves were forecast to hit Iwate and Aomori prefectures at the top of Japan's main Honshu island, and the northern island of Hokkaido, authorities said.

In the hour following the earthquake, which struck at 4:52 p.m. Local time, tsunami waves as high as 80 centimetres had been detected, while warnings remained for waves as high as three metres. Japan's Meteorological Agency (JMA) kept their tsunami alert in place while the Pacific Tsunami Warning Centre said the tsunami threat from the quake "has now passed."

Several port towns including Otsuchi and Kamaishi — both hard-hit by a massive earthquake and tsunami in 2011 — issued evacuation orders for thousands of residents, according to public broadcaster NHK.

Prime Minister Sanae Takaichi said the government had set up an emergency task force and urged citizens in the affected areas to evacuate to safety.

"Possible damage and casualties are now being looked into," Takaichi told reporters at her offices in Tokyo.

Here's why Japan leads the world in responding to earthquakes

Big aftershocks may occur in the following days and weeks, an official from JMA said at a separate televised press conference.

Ships sailed out of Hachinohe port in Hokkaido in anticipation of the waves, footage aired on NHK showed, as a "Tsunami! Evacuate!" alert flashed across the screen. A three-meter tsunami could cause damage to low-lying areas, flooding buildings, and anybody exposed would be caught in its currents, according to JMA.

Bullet train services in Aomori were halted due to the tremors, Kyodo news agency reported.

The quake measured an "upper 5" on Japan's seismic intensity scale — strong enough to make it difficult for people to move around and cause unreinforced concrete-block walls to collapse. The tremor had an epicentre in the Pacific Ocean and was 10 kilometres deep, JMA said.

Located in the "Ring of Fire" of volcanoes and oceanic trenches partly encircling the Pacific Basin,  Japan is one of the world's most earthquake-prone countries, with a tremor occurring at least every five minutes.

It accounts for about 20 per cent of the world's earthquakes of magnitude 6.0 or more, such as the 2011 disaster that caused nuclear meltdowns at a Fukushima power plant.

There are no nuclear power plants currently in operation in the affected areas and Hokkaido Electric Power Co 9509.T and Tohoku Electric Power Co 9506.T said there were no abnormalities reported at their idled facilities there.

Another 7.5 magnitude quake in December left dozens injured.

It's been more than 15 years since a magnitude 9.0 earthquake and tsunami on March 11, 2011, ravaged parts of northern Japan, caused more than 22,000 deaths and forced nearly half a million people to flee their homes, most of them due to tsunami damage.

Some 160,000 people fled their homes in Fukushima because of the radiation spewed from the tsunami-hit Fukushima Daiichi nuclear power plant. About 26,000 of them haven't returned because they resettled elsewhere, their hometowns remain off-limits or they have lingering concerns about radiation.

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