Dangerous Fault Found in Turkey, Scientists Fear Megaquake

Added: 2026-05-31

[00:00:00]Turkey may need to brace itself for one of the most devastating mega quakes we've ever seen. New 3D models suggest a major fault line just outside Istanbul has been building pressure for centuries and it could rupture at any time.

[00:00:14]What's crazy is that the sun could help set it off. Up in space, powerful solar bursts can mess with Earth's magnetic field. That can trigger geomagnetic storms which send electric currents through the ground. And if a fault is already under extreme stress like this one in Turkey, some researchers argue that extra electromagnetic energy could be the final push.

[00:00:39]This mega earthquake will probably start right here in the Sea of Marmara. It separates Turkey's Asian side from its European side. And at first glance, it doesn't look dangerous at all. No strong currents, no scary sharks, and it's even considered the smallest sea in the world. But the real danger is actually underneath it.

[00:00:59]The Sea of Marmara is deep. Its deepest point is about 4,500 ft and way down there runs the North Anatolian Fault or just the NAF.

[00:01:10]This is a long, active, right-lateral strike-slip fault that stretches across northern Turkey. In simple terms, it's the boundary where the Eurasian Plate and the smaller Anatolian Plate slide past each other. It's very similar to California's San Andreas Fault in [music] size, slip rate, and overall behavior.

[00:01:30]And just like in the US, this fault in Turkey can also trigger powerful earthquakes. One of the most catastrophic ones [music] is known as the Erzincan Earthquake. On December 26th, 1939, a long section of the North Anatolian Fault suddenly ruptured. The ground on both sides of the fault snapped past each other unleashing a massive quake that hit the Erzincan region. It was devastating. Around 116,000 buildings were destroyed. More than 100,000 people were affected and over 30,000 lost their lives.

[00:02:05]Ever since that tragedy, researchers have been keeping a close eye on the fault and they've noticed a pretty scary pattern.

[00:02:12]Big, destructive earthquakes along this fault don't happen randomly. They seem to march westward over time.

[00:02:20]And that's why one particular stretch under the Sea of Marmara is getting so much attention, especially because it's, well, quiet.

[00:02:30]Okay, maybe not that quiet. This area has had earthquakes in recent years and they've been getting stronger.

[00:02:37]Since 2011, the quakes have gradually increased in magnitude leading up to the magnitude 6.2 Marmara earthquake in 2025. That was the biggest event on this fault in more than 60 years.

[00:02:49]But when I say quiet, I mean that it hasn't had a truly major quake since 1766, something above magnitude 7 on the Richter scale. To put that into perspective, that's about the same power as the 2010 Haiti earthquake where about 160,000 people lost their lives.

[00:03:10]Not having a big quake in centuries in Turkey sounds like good news, but it's actually very concerning. When you don't see big movement for a long time, it can mean stress is piling up beneath the fault and that makes it a high-risk zone.

[00:03:25]Earlier studies from 2023 found that the fault beneath the Sea of Marmara is split into several different sections and they don't all behave the same way.

[00:03:36]In the west, [music] for example, the fault moves very slowly. That can cause smaller reoccurring earthquakes.

[00:03:43]>> [music] >> So, instead of one huge event, some of the energy gets released little by little. But as you move east, that slow movement happens less often. And just south of Istanbul, the fault doesn't seem to move at all. It's basically locked.

[00:03:59]All these areas are under stress because tectonic plates keep pushing from underneath. And on top of that, past earthquakes can also add even more stress to the [music] system.

[00:04:09]But the biggest concern is that locked section. It doesn't release enough energy through small shakes, >> [music] >> so the pressure can keep building.

[00:04:18]And since the nearby sections are still creeping along, they can add even more strain and concentrate stress in one spot.

[00:04:26]And when that built-up energy finally releases, trust me, you don't want to be anywhere near it.

[00:04:33]All that pressure could trigger a major devastating earthquake.

[00:04:37]Possibly one of the biggest in Turkey's modern history. But there's a problem.

[00:04:41]It's incredibly hard to study this region.

[00:04:45]That's because this part of the North Anatolian Fault is basically invisible to us. It's underwater. It's been relatively quiet for centuries, >> [music] >> and its detailed 3D structure isn't easy to detect using traditional mapping methods.

[00:04:59]So, how do you even study something like that? Without a clear image, it's almost impossible to know how dangerous this zone really is.

[00:05:08]Thankfully, researchers may have found a solution.

[00:05:11]Scientists from the Institute of Science Tokyo used electromagnetic imaging to map it, almost like taking an X-ray of the Earth.

[00:05:19]They used something called magnetotellurics.

[00:05:22]Basically, it lets scientists detect tiny changes in Earth's electric and magnetic fields, changes caused by structures deep underground.

[00:05:31]Using that, they built the first 3D map of the North Anatolian Fault based on something called resistivity, which is how strongly rocks resist electric current.

[00:05:42]This map helped them spot locked zones where stress has been building up for a long time.

[00:05:47]And the boundaries around those locked areas could be exactly where the next major rupture starts, giving Turkey a much clearer idea of where the biggest risk may be and how to prepare.

[00:06:00]And they really need that because the area where this could happen is dangerously close to Istanbul. This is Turkey's biggest city with around 15 million people and it's also the country's main industrial hub. It's a real economic powerhouse generating close to 40% of Turkey's GDP every year.

[00:06:20]So yeah, a major quake near Istanbul wouldn't just shake the city. It could shake the whole country economically speaking.

[00:06:28]That brings us to the big question. When could it happen?

[00:06:32]That's still a mystery, but it might be sooner than people think.

[00:06:37]Historical records going back more than 2,000 years suggest that [music] big earthquakes in this particular region tend to repeat about every 250 years on average.

[00:06:48]And since the [music] last major one was in 1766, that's not great news for Turkey.

[00:06:55]Do the math and you'll see why people are worried. The main Marmara fault is already late in its seismic cycle, which means it has the potential to produce a large earthquake at any time.

[00:07:06]But it's not like Turkey is caught off guard. The country knows these risks and it's been staying on top of them. For years they've been working on ways to reduce the damage when the next big quake hits because in a situation like this, being fast doesn't just help. It can save lives.

[00:07:24]That's why they've been upgrading their earthquake early warning system. The goal is to catch the very first signals of a [music] quake, the P waves. They're the first waves to hit and they're weaker. The S waves are the ones that do more damage.

[00:07:38]Normally it takes about 5 or 6 seconds to [music] catch these P waves and send an alert, but this newer technology can do it in just [music] 0.2 seconds.

[00:07:47]That's incredibly fast.

[00:07:50]The problem [music] is there still aren't enough sensors on the ocean floor. So, the signal hits the coast about 6 seconds late, which limits how early the warning can come, at least for now.

[00:08:01]Still, the progress is real. In October 2025, the upgraded system made its debut and sent its first alert in just 8.4 seconds [music] after a magnitude 5 quake struck the Sea of Marmara.

[00:08:14]And that's a big deal because every second can trigger automatic safety actions, slowing trains, stopping elevators, shutting down gas lines, and giving people just enough time [music] to react.

[00:08:26]The next step is to place more sensors on the seabed so they can buy even more time.

[00:08:32]And if Turkey keeps preparing and investing [music] in this kind of technology, the next major earthquake may be a lot less dangerous than we think.