M7.7 EARTHQUAKE HITS JAPAN! Tsunami Waves Detected.Government Warns BIGGER QUAKE IMMINENT This Week

Ajouté : 2026-05-04

[00:00:00]A magnitude 7.7 earthquake just tore open the seafloor off Japan's coast.

[00:00:04]Tsunami waves hit within minutes and the Japanese government just warned this might not be the main event. Here's what happened in the last 24 hours and what scientists say is coming next. The ground ruptured 100 km off the coast of Iwate prefecture. It happened at 4:53 in the afternoon local time, 20 km deep.

[00:00:22]That's shallow and shallow means dangerous.

[00:00:25]The Japan Meteorological Agency JMA immediately issued a full tsunami warning, not an advisory, a warning.

[00:00:32]Waves up to 3 m, nearly 10 ft, were expected to slam the coast within minutes. Sirens blared in Ofunato.

[00:00:38]Loudspeakers screamed across the port town of Kamaishi.

[00:00:42]172,000 people in Hokkaido, Aomori, Iwate, Miyagi, and Fukushima prefectures were ordered to evacuate immediately.

[00:00:50]You need to know one thing about those towns. Kamaishi and Otsuchi were both wiped off the map in 2011. This is the exact same coastline. At 4:53 p.m. the rupture began.

[00:01:00]USGS data shows the seafloor shifted across a zone 70 km long and 65 km wide.

[00:01:06]The maximum slip at the hypocenter, 4 and 1/2 m.

[00:01:10]In 12 seconds, the Pacific plate lurched beneath the Okhotsk plate and the ocean above it heaved. Buildings swayed for 7 minutes in Tokyo, 558 km to the south.

[00:01:20]In Morioka, the shaking hit 0.4 G, enough to throw unsecured furniture across a room.

[00:01:26]In coastal Noda and Kuji, shaking reached intensity six on Japan's scale.

[00:01:31]That's the level where it becomes difficult to stay standing. Here's where it gets strange. This exact fault zone produced a sequence of 162 foreshocks going back to November 2025. Five of those foreshocks were magnitude 6.0 or stronger. The largest hit, magnitude 6.8, just months before today. The fault was talking. And Monday, it screamed.

[00:01:52]The tsunami warning sent people running.

[00:01:54]Coastal Japan has drilled for this moment. Evacuation routes were pre-planned, but the clock was already ticking. The first waves were minutes away. JMA forecast up to 3 m. What actually arrived? 80 cm at Kuji Port, 40 cm at Miyako, 40 cm at Urakawa in Hokkaido, 30 cm at Hachinohe. Still dangerous.

[00:02:14]A 1-ft wave carries enough force to knock a person off their feet and drag them into the sea. Officials warned about this explicitly. A retreating wave is just as lethal, pulling people off land and sweeping them under.

[00:02:26]But here's what you need to understand about those wave heights. The forecast said 3 m. The waves came in at 80 cm.

[00:02:33]That gap doesn't mean the warning was wrong. That gap means the evacuation worked.

[00:02:38]Let's talk about who felt this.

[00:02:40]182 municipalities from Hokkaido all the way down to Chiba prefecture are now under a special government advisory.

[00:02:47]That's the entire northeastern spine of Japan's main island. Iwate prefecture took the hardest hit. The ports of Kamaishi, Miyako, and Kuji all ordered empty. The Tohoku Shinkansen, the bullet train connecting Tokyo to the north, suspended all operations. Power went out across 200 households in Aomori and Iwate. 26 buildings, including schools and restaurants in Aomori, were damaged.

[00:03:08]Ferry services between Aomori and Hakodate were canceled. Six people were injured, two seriously. And 82,111 households, nearly 176,000 people, were told to get out. Right now.

[00:03:23]Prime Minister Sanae Takaichi stood in front of cameras and said it directly.

[00:03:27]Residents should immediately evacuate to higher ground. A government crisis task force was activated within the hour and then the advisory nobody wanted to hear.

[00:03:37]Here's where this story gets bigger than one earthquake. The JMA issued a subsequent earthquake advisory active through April 27th. And the number they put on it shocked even veteran seismologists. Normally, on any given week in Japan, the probability of a magnitude eight or stronger earthquake is 0.1%, one in a thousand.

[00:03:56]After Monday's quake, JMA raised that to 1%. That sounds small.

[00:04:00]But earthquake scientist Amilcar Carrera Cavallos put it plainly.

[00:04:05]This 1% probability is still low in absolute terms, but it's 10 times higher than normal, which is significant from a risk management perspective.

[00:04:12]10 times higher. And here's why that number carries weight.

[00:04:16]This is not the first time JMA has issued this kind of advisory. August 2024, a magnitude 7.1 quake in southern Japan triggered the very first megaquake advisory in the country's history. Panic buying of rice and water cleared supermarket shelves. Hotels in coastal Shikoku saw mass cancellations.

[00:04:33]That advisory was for the Nankai Trough, Japan's other seismic nightmare. Then in December 2025, another advisory after a magnitude 7.5 struck off the northern coast. Now, April 2026, a third event.

[00:04:46]Three major advisories in less than two years. The pattern matters. Japan sits on the convergence of four tectonic plates, the Pacific Plate, the Philippine Sea Plate, the Eurasian Plate, the Okhotsk Plate. These plates are constantly grinding, locking, and releasing. And the stress doesn't disappear after one quake, it redistributes. This is the same Sanriku Oki subduction zone that produced the 2011 Tohoku earthquake, the magnitude 9.0 that killed more than 18,500 people and triggered the Fukushima nuclear disaster. Monday's quake released roughly 1/200 of the energy of that event, but it struck in the same geometry, the same fault architecture, the same coastline. Earthquake geologist Wendy Bohon said it directly. It is important for people who may be at risk to understand that another large earthquake is possible, even if it is unlikely.

[00:05:30]And then there's the shadow looming over all of this, the Nankai Trough, an 800-km undersea trench off Japan's southern Pacific coast where the Philippine Sea Plate is silently sliding beneath the continent. That fault has ruptured in pairs roughly every 100 to 150 years. The last pair struck in 1944 and 1946. The Japanese government has modeled what happens next. Up to 298,000 people killed, tsunamis exceeding 10 m, economic damage of $2 trillion. Monday's quake wasn't on the Nankai Trough, but it is a reminder that every major fault in Japan is under stress simultaneously.

[00:06:06]Here is exactly what to watch for through April 27th. JMA's subsequent earthquake advisory runs through next Monday. The elevated window is real and the agency is not calling it a false alarm. Three things to watch. First, aftershock sequences. Four aftershocks of magnitude 5.0 or higher hit within hours of the main quake. The largest reached 5.6. That sequence is still active. Any event approaching magnitude 6.5 or higher in the next 72 hours should be taken seriously. Second, tsunami re-triggering.

[00:06:36]JMA officials warned explicitly. Tsunami waves can arrive repeatedly. Coastal residents were told not to return to shore until all warnings were fully lifted. If a significant aftershock occurs offshore, that warning could be reissued with no additional notice.

[00:06:50]Third, the Nankai Trough. Some researchers believe that major seismic events in northern Japan can alter stress loading on distant fault systems. JMA has not issued a Nankai advisory following Monday's quake, but the government has already warned the public. A major Nankai event is not a question of if, it's a question of when.

[00:07:08]Here's the scenario JMA has outlined. If a magnitude 8.0 or stronger rupture occurs along the Japan Trench in the next 7 days, tsunami wave heights would far exceed Monday's 80 cm observation.

[00:07:19]Official modeling puts potential waves at up to 3 m or higher along the Sanriku coast. This is the official worst-case scenario. It has not happened. But it is why 182 municipalities remain on elevated alert right now. The most likely outcome, according to earthquake geologist Wendy Bohon and JMA data, is that Monday's quake was the main event.

[00:07:39]Aftershocks will diminish.

[00:07:41]The advisory window closes April the 27th and life along the Sanriku coast returns to cautious normal. But cautious is the right word. Three things to remember. A magnitude 7.7 earthquake struck 100 km off Iwate prefecture on April 20th, the same fault system that produced the 2011 disaster.

[00:07:58]Tsunami waves reached 80 cm at Kuji Port and 172,000 people were evacuated across five prefectures. Japan's government has now issued a megaquake advisory for the third time in two years with a tenfold increase in the probability of a magnitude eight or greater event through April 27th. If you want to stay ahead of what's happening to Earth right now, subscribe. I post every time something major breaks. Coming next, the Nankai Trough, Japan's other fault, the one scientists say is overdue. What a rupture there actually looks like and why the government's $2 trillion damage estimate may be too low. That video is on the screen right now. If Monday's earthquake made you want the full picture, you need to see it. Stay safe.