TOKYO (AP) — Japan issued a megaquake advisory Tuesday after a magnitude 7.5 earthquake struck off the eastern coast of Aomori, the northernmost prefecture of Japan's main island of Honshu, and just south of the northern island of Hokkaido. Damage from this quake was modest — 34 mostly mild injuries and some damage to roads and buildings.
Officials said the advisory is not a prediction and the probability of a magnitude 8 or larger quake is only about 1%. But there’s hope the advisory will serve as a wake-up call for a quake that could have the devastation of the 2011 disaster that killed nearly 20,000 people and destroyed a nuclear plant.
There's said to be an increased risk of a subsequent, magnitude-8 or larger quake within the next week. Officials are urging residents, especially along coastal areas, to be well prepared so they can grab an emergency bag and run as soon as possible if a bigger quake hits.
This advisory seemed mindful compared with another advisory last year. The southern half of Japan's Pacific coastline received a “Nankai Trough” megaquake advisory in the summer of 2024, but the ambiguity of that warning led to panic buying of emergency food, event cancellations and business closures.
The Japan Meteorological Agency says Monday's powerful quake temporarily increased potential risks in the regions of Hokkaido and the Sanriku coast. That's where the Pacific Plate beneath Japan forms the two trenches — the Japan Trench and Chishima Trench — that have caused many large quakes in the past.
Experts say the deadly quake and tsunami in 2011 was caused by movement associated with the Japan Trench. It spans from off the eastern coast of Chiba to Aomori, and the Chishima Trench goes from the eastern coast of Hokkaido to the northern islands and the Kurils.
In explaining the advisory, the JMA said the magnitude 9.0 quake on March 11, 2011, that devastated large swaths of Japan's northern coast occurred two days after a magnitude 7.3 temblor that occurred at the Japan Trench off the eastern coast of Iwate, one of the hardest-hit areas in that disaster as well as in Monday's quake.
The 2011 quake caused a tsunami that battered northern coastal towns in Iwate, Miyagi and Fukushima prefectures. The tsunami, which topped 15 meters (50 feet) in some areas, slammed into and destroyed the Fukushima Daiichi nuclear power plant. That created deep fears of radiation that linger to this day.
Another offshore megaquake in the Hokkaido-Sanriku area could cause up to a 30-meter (98-foot) tsunami in the region, kill as many as 199,000 people, destroy up to 220,000 houses and buildings, and cause estimated economic damages of up to 31 trillion yen ($198 billion), according to an estimate by the government. It says as many as 42,000 people could suffer from hypothermia in the winter.
The areas covered by the advisory extend across 182 municipalities from Hokkaido to Chiba prefecture.
Japan's separate advisory for an even more damaging megaquake stemming from the Nankai Trough, which affects the southern half of Japan's Pacific coast, was activated for the first time last August after a magnitude 7.1 quake occurred off the eastern coast of Miyazaki.
In a 2013 damage estimate for a possible Nankai Trough megaquake, the government said a magnitude 9.1 quake could generate a tsunami exceeding 10 meters (33 feet) within minutes, killing as many as 323,000 people, destroying more than 2 million buildings and causing economic damage exceeding 200 trillion yen ($1.28 trillion) in the region.
Officials are stressing that the latest advisory has no prediction for any megaquake happening at any specific time or location, a Cabinet official for disaster prevention, Tsukasa Morikubo, told a news conference early Tuesday. He called on residents to be cautious and prepared while continuing their daily activity and work.
Officials urge people to keep an emergency bag containing a few days' worth of daily necessities along with shoes and helmets. People in the region are also advised to discuss evacuation procedures with family members and sleep in day clothes, not in pajamas, so they can flee immediately. Furniture should also be fixed to the floor or the wall.
The designated municipalities explained the advisory on their websites and started inspecting stocks of relief goods and equipment to be used at evacuation centers.
Iwaki City in Fukushima urged residents to register for emergency emails, while officials in the town of Oarai in Ibaraki prefecture, northeast of Tokyo, inspected wireless communication devices.
Japan's first megaquake advisory in August of last year contained a lot of scientific jargon. It worried and baffled many across the country. Some towns closed beaches and canceled annual events, disappointing many travelers during Japan's Buddhist holidays.
Many people postponed planned trips and rushed to stock up on rice, dried noodles, bottled water and portable toilets, leaving shelves empty at many supermarkets in western Japan and even Tokyo, which is outside of the at-risk area.
A man clears the debris from a powerful earthquake at a commercial facility in Hachinohe, Aomori prefecture, northern Japan Tuesday, Dec. 9, 2025. (Ren Onuma/Kyodo News via AP)
People cover the broken glasses with a blue sheet at a beauty salon in Hachinohe, Aomori prefecture, northern Japan Tuesday, Dec. 9, 2025, following a powerful earthquake on late Monday. (Kazuki Kozaki/Kyodo News via AP)
This aerial photo shows a vehicle sitting on a damaged road in Tohoku town, Aomori prefecture, northern Japan Tuesday, Dec. 9, 2025, following a powerful earthquake on late Monday. (Kyodo News via AP)
DUBAI, United Arab Emirates (AP) — Iran responded to U.S. President Donald Trump’s address to Americans on the war with new missile attacks targeting Israel and the Gulf Arab states Thursday, underlining Tehran’s insistence that it rejected Washington’s outreach for a ceasefire while maintaining its grip on the Strait of Hormuz.
Britain planned to hold a call Thursday with nearly three dozen countries about how to reopen the strait, through which 20% of all oil and natural gas traded passes in peacetime. The 35 countries, including all G7 industrialized democracies except the U.S., as well as the United Arab Emirates and Bahrain, signed a declaration last month demanding Iran stop blocking the strait. The call will discuss “diplomatic and political measures” that could restore shipping once the fighting is over.
Washington has insisted that Iran allow ships to freely transit the strait, but Trump this week has said it is not up to the U.S. to force it, and in his address encouraged countries that receive oil through Hormuz to “build some delayed courage” and go “take it.”
In his address, Trump said the U.S. would hit Iran “extremely hard over the next two to three weeks,” while also insisting American “core strategic objectives are nearing completion.”
Iran's military said defiantly on Thursday that its armament facilities are hidden and will never be reached by Israeli or American attacks.
“The centers you think you have targeted are insignificant,” said Lt. Col. Ebrahim Zolfaghari, a spokesman for the Iranian military’s Khatam Al-Anbiya Central Headquarters.
Just before Trump began his nearly 20-minute address on Wednesday, explosions were heard in Dubai as air defenses worked to intercept an Iranian missile barrage. Less than a half hour after the president was done, Israel said its military was working to intercept incoming missiles.
Sirens sounded in Bahrain, home to the U.S. Navy's 5th Fleet, immediately after the speech.
Following a joint statement in March condemning Iranian attacks on unarmed commercial vessels that called upon Iran to “cease immediately its threats, laying of mines, drone and missile attacks and other attempts to block the strait,” the 35 signatories were to hold a virtual meeting Thursday hosted by British Foreign Secretary Yvette Cooper.
Though the oil and gas that typically transits the Strait of Hormuz primarily is sold to Asian nations, Japan and South Korea were the only two countries from the region that were joining.
“Trump’s message was that the United States can sustain its own economic and energy ecosystem, while countries dependent on regional exports will either have to buy from the United States or manage the Strait themselves,” the New York-based Soufan Center think tank wrote after the address.
“While Trump explicitly thanked U.S. allies in the Persian Gulf for their cooperation and allyship, an expedited U.S. withdrawal without securing the strait will leave many of these countries, whose economies are dependent on energy exports, in the lurch.”
No country appears willing to try and open the strait by force while the war is raging. British Prime Minister Keir Starmer said the group “will assess all viable diplomatic and political measures we can take to restore freedom of navigation, guarantee the safety of trapped ships and seafarers and to resume the movement of vital commodities.”
Bahrain, which now holds the presidency of the United Nations Security Council, has been working to get the world body to address the crisis as well.
Though Iran has allowed a trickle of ships through the strait, it remains largely closed. Iran has also been repeatedly attacking Gulf Arab energy infrastructure, sending oil prices skyrocketing and giving rise to broader economic problems worldwide.
Following Trump's speech, Brent crude, the international standard, rose again and was at $108 in early spot trading, up nearly 50% from Feb. 28 when Israel and the U.S. started the war with their attacks on Iran.
The rising energy prices and stock market jitters have been putting increasing domestic pressure on Trump, who used his address to offer a defense of the war while also suggesting it was close to winding down.
He acknowledged American service members who had been killed and said: “We are going to finish the job, and we’re going to finish it very fast. We’re getting very close.”
The U.S. has presented Iran with a 15-point plan for a ceasefire, but Trump didn’t say anything about the diplomatic efforts or bring up his April 6 deadline for Iran to reopen the Strait of Hormuz or face severe retaliation from the U.S.
More than 1,900 people have been killed in Iran during the war, while 19 have been reported dead in Israel. More than two dozen people have died in Gulf states and the occupied West Bank, while 13 U.S. service members have been killed.
More than 1,200 people have been killed in Lebanon and more than 1 million displaced, according to authorities. Ten Israeli soldiers have also died there.
Weissert reported from Washington and Rising reported from Bangkok.
The Indian flagged LPG carrier Jag Vasant transporting liquefied petroleum gas, is seen at the Mumbai Port in Mumbai, India, after it arrived clearing the Strait of Hormuz, Wednesday, April 1, 2026. (AP Photo/Rafiq Maqbool)
President Donald Trump speaks about the Iran war from the Cross Hall of the White House on Wednesday, April 1, 2026, in Washington. (AP Photo/Alex Brandon, Pool)
President Donald Trump walks from the Blue Room to speak about the Iran war from the Cross Hall of the White House on Wednesday, April 1, 2026, in Washington. (AP Photo/Alex Brandon, Pool)
President Donald Trump speaks about the Iran war from the Cross Hall of the White House on Wednesday, April 1, 2026, in Washington. (AP Photo/Alex Brandon, Pool)
President Donald Trump speaks about the Iran war from the Cross Hall of the White House on Wednesday, April 1, 2026, in Washington. (AP Photo/Alex Brandon, Pool)
