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Public broadcaster NHK urged residents in the region to “flee immediately” to high ground, reminding listeners to heed the lessons of the “Great East Japan Earthquake”.
A massive undersea quake that hit in March 2011 sent a tsunami barrelling into the coast, leaving more than 18,500 people dead or missing, and sending three reactors into meltdown at the Fukushima Daiichi power plant in one of the world’s worst nuclear disasters.
An official from plant operator TEPCO told a televised news conference that a one-metre wave had hit the coast at the facility, but a spokesman for the company told AFP there were no reports of damage as a result.
TEPCO earlier reported that a water cooling system at a reactor in the separate Fukushima Daini facility had briefly stopped but that it was back up and operating.
The temporary stoppage was an automatic response, the Fukushima operator said.
Several other tsunami waves, the biggest measuring 1.4 metres (4.6 feet), hit elsewhere on the northeastern coast, according to NHK.
The public broadcaster provided rolling coverage on the earthquake, with the words “Tsunami! Flee!” written in white lettering over a bright red band in the middle of the screen.
No signs of damage were immediately evident from the broadcaster’s images.
The vast majority of deaths in the 2011 disaster resulted from the tsunami.
The United States Geological Survey said the 6.9 magnitude quake, at a shallow depth of 11.3 kilometres (seven miles), struck shortly before 6:00 am (2100 GMT on Monday) in the Pacific Ocean off Fukushima.
The Meteorological Agency had earlier estimated the quake’s magnitude at 7.3 but upgraded it to 7.4.
Report of fire
There were no immediate reports of damage or injuries from the quake, which also shook buildings in Tokyo.
Speaking during a visit to Argentina, Prime Minister Shinzo Abe directed the central government to work with authorities in the affected areas.
He said he ordered his cabinet ministers to “assess damage and do their utmost to cope with the disaster”.
Chief Cabinet Secretary Yoshihide Suga told a press conference in Tokyo that no significant harm had been detected at the nuclear plants in the region.
“There has been no major damage to the Fukushima Daiichi or Onagawa plant” in Miyagi prefecture, he said.
Kyodo News agency reported that a fire broke out at a petroleum complex in the town of Iwaki, but that it had been put out.
“It was a fairly strong earthquake, but we have not received any reports of injuries,” said Nobuyuki Midorikawa, an official in Iwaki city, south of the Fukushima Daiichi plant.
In April, two strong earthquakes hit southern Japan’s Kumamoto prefecture followed by more than 1,700 aftershocks, leaving at least 50 dead and causing widespread damage.
Japan sits at the junction of four tectonic plates and experiences a number of relatively violent quakes every year.
Professor James Goff, director of the Australia-Pacific Tsunami Research Centre at the University of New South Wales, said he would not expect waves to reach the heights of those in 2011, but that the most recent quake could still cause damage.
“One concern is not necessarily the size of the earthquake itself but whether or not it might generate submarine landslides that can themselves generate large tsunamis,” he said.
“Tsunamis as small as 90 cm can be extremely damaging.”