A powerful 7.4 magnitude earthquake struck off Japan's northeast coast on Monday, prompting tsunami warnings and evacuations in coastal areas.
The epicenter of the quake was about 62 miles east-northeast of Miyako, off the coast of Sanriku, according to the U.S. Geological Survey. It happened around 4:53 p.m. local time (3:53 a.m. EDT), and tsunami warnings were issued for Iwate Prefecture, the central Pacific coastal area of Hokkaido Prefecture and the coastal area of Aomori Prefecture. There was a 5.6 aftershock less than an hour after the main quake.
Japan's Prime Minister Sanae Takaichi urged people in the warning zones to immediately evacuate and seek higher ground.
A tsunami of about 2.6 feet was detected at the Kuji port in the Iwate Prefecture, and a smaller tsunami of 1.3 feet was recorded at another port in the prefecture, Japan's meteorological agency said.
The agency urged residents in the region to immediately stay away from the coast or along rivers and take shelter on higher ground. It also cautioned people in the area against possible aftershocks for about a week.
On social media, there are reports that train service was suspended as earthquake alerts sounded. This post on X said the emergency brake was pulled and the train stopped inside a tunnel.
Pots and pans inside a ramen restaurant in Yamagata swayed and shook as the quake struck. The Fire and Disaster Management Agency said officials are assessing the situation but so far no damage or injuries have been reported, including at power stations and other facilities.
Within hours of the quake officials issued an advisory for an increased risk of a possible "mega-quake." The Cabinet Office and the Japan Meteorological Agency said there is 1% chance for a mega-quake occurring on the northern Japanese coast in the next week or so.
Officials said the advisory is not a quake prediction but urged residents to raise their preparedness, such as emergency food and their grab bag just in case, while continuing their daily lives.
The advisory for the region is the second in recent months. One was issued following another major quake in December. No major subsequent quake occurred.
The Iwate Prefecture issued non-binding evacuation advisories to residents in 11 towns, according to reporting from the Associated Press.
The 7.6 magnitude quake on Dec. 8 happened just 85 miles away from Monday's quake, reports the USGS.
The agency also noted that Monday's earthquake occurred about 120 miles north of the 2011 deadly earthquake and tsunami that devastated parts of northern Japan. The magnitude 9.0 quake and tsunami on March 11, 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.
Japan earthquake live: Tsunami warning issued as huge 7.4 tremor hits coast
A tsunami warning has been issued with mass evacuations underway after a 7.4 magnitude earthquake struck off the Japanese coast.
The tremor struck off the northeastern coast of the country this afternoon (April 20) and the Japan Meteorological Agency has warned a tsunami as high as three metres could hit in Iwate prefecture and parts of Hokkaido.
It’s 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.
People leave lower ground for parks on higher ground amid tsunami fear
Many people have been seen driving up to parks and other facilities on higher ground amid the evacuation orders.
In the town of Tomakomai in Hokkaido, a resident came to a hilltop park after picking up his child at a cram school and said he planned to stay until the alert is lifted.
Iwate and three other northern prefectures issued non-binding evacuation advisories to more than 128,000 residents, according to the disaster management agency.
According to the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications, evacuation orders had been issued to 156,471 people in five prefectures: Hokkaido, Aomori, Iwate, Miyagi, and Fukushima.
Japan warns of slightly increased risk of mega-quake after a 7.7-magnitude one
An earthquake registering a preliminary magnitude of 7.7 off northern Japan on Monday prompted a short-lived tsunami alert and the advisory of a higher risk of a possible mega-quake for coastal areas there.
The Cabinet Office and the Japan Meteorological Agency said there was a 1% chance for a mega-quake, compared to a 0.1% chance during normal times, in the next week or so following the powerful quake near the Chishima trough.
Officials said the advisory was not a quake prediction but urged residents to raise their preparedness while continuing their daily lives.
It was the second such advisory for the region in recent months. One was issued following a 7.5-magnitude quake in December but no mega-quake occurred.
The Fire and Disaster Management Agency said one person in Aomori, north of Iwate, was injured after falling Monday.