A volcano can look dead on the surface while building pressure below
Beneath the apparent stillness of volcanoes long declared extinct, the Earth may still be gathering its breath. Research into Methana, a volcano near Athens silent for 110,000 years before erupting again, has prompted scientists to question whether the 10,000-year threshold used to classify a volcano as dead is dangerously insufficient. The study, drawing on zircon crystal records spanning 700,000 years of activity, argues that time alone is a poor guardian — and that geophysical signals, not calendars, should guide how humanity watches the ground it builds upon.
- A volcano near Athens stayed silent for 110,000 years and then erupted again, shattering the scientific rule that 10,000 years of quiet means a volcano is extinct.
- Regions like western Germany's Eifel and northeastern Spain's La Garrotxa — home to millions — may be sitting above volcanic systems that current protocols wrongly dismiss as harmless.
- Cases in Iran, Romania, and Ethiopia show that magma can persist and accumulate silently beneath surfaces that appear geologically inert, with some systems already showing measurable ground deformation.
- Scientists are calling for a fundamental shift: replace time-elapsed classification with active monitoring of subsurface pressure, ground movement, and geophysical signals that reveal what clocks cannot.
- The window to act is uncertain — if monitoring systems do not expand before a misclassified volcano stirs, populated areas could face eruptions with little or no warning.
A volcano near Athens called Methana was quiet for 110,000 years — and then it erupted. That single fact is now compelling volcanologists to reconsider one of their most foundational assumptions about which volcanoes are truly dead.
By analyzing zircon crystals preserved in ancient lava, researchers reconstructed 31 eruptions across roughly 700,000 years of Methana's history. The longest silence in that record lasted approximately 110,000 years. When it ended, the volcano returned with force. The implication is stark: the standard scientific threshold — classifying a volcano as extinct if it has not erupted in around 10,000 years — may be dangerously arbitrary.
Răzvan-Gabriel Popa of ETH Zurich, a coauthor of the study, warned that volcanoes appearing extinct today may not be. The concern is not merely academic. In Romania, Ciomadul was considered extinct until 2019 research found magma still present beneath it. In Iran, the Taftan volcano's summit has been rising, likely from gas accumulation below. In Ethiopia, Hayli Gubbi erupted in 2025 after a silence so long its previous eruption remains undated.
The highest stakes lie in densely populated areas. Eifel in western Germany and La Garrotxa in northeastern Spain sit above volcanic systems that current classifications may be underestimating. Modern tools — satellite monitoring of ground deformation, geophysical imaging of subsurface structures — already exist to detect the subtle signs that precede eruptions, as the tremors before Pinatubo's 1991 eruption demonstrated.
The research asks a difficult question of the scientific community: will monitoring expand to reflect this new understanding before a supposedly extinct volcano catches an unprepared region off guard?
A volcano near Athens has been quiet for 110,000 years. Then it woke up. This simple fact is now forcing scientists to reconsider everything they thought they knew about which volcanoes are truly dead and which are merely sleeping.
The volcano is Methana, and its history—reconstructed through careful analysis of zircon crystals embedded in ancient lava—tells a story that challenges the way the world classifies volcanic risk. Researchers found 31 eruptions spread across roughly 700,000 years of activity, separated by long stretches of silence. The longest of these quiet periods lasted approximately 110,000 years, occurring between roughly 280,000 and 168,000 years ago. When that silence finally broke, the volcano returned to life with intensity, and it has remained intermittently active ever since.
The problem is not Methana itself. The problem is what Methana reveals about how we think. For decades, volcanologists have used a simple rule: if a volcano has not erupted in about 10,000 years—roughly since the start of the Holocene epoch, 11,700 years ago—it is classified as extinct. Dead. No longer a threat. But Methana's 110,000-year dormancy suggests this threshold is dangerously arbitrary. A volcano can be silent for longer than human civilization has existed and still be accumulating magma in the depths, waiting.
Răzvan-Gabriel Popa, a researcher at ETH Zurich and coauthor of the study, put it plainly: volcanoes that appear extinct today "perhaps are not really extinct." The distinction matters because it changes how we should be watching the ground beneath our feet. Current classification relies almost entirely on elapsed time. What scientists now argue for is something more sophisticated: monitoring for actual signs of magmatic activity—ground deformation, shifts in the subsurface, geophysical signals that reveal what is happening below. A region can look peaceful while pressure builds invisibly.
Methana is not alone in challenging this old certainty. In Iran, the Taftan volcano has drawn renewed attention after studies showed its summit rising, likely from gas accumulation beneath the surface. In Romania, Ciomadul was long considered extinct until 2019 research detected magma still present underneath. Popa's team found the system appears to be growing, though it has not yet erupted. In Ethiopia, Hayli Gubbi erupted in 2025 after a long period with no recorded activity—so long that scientists cannot yet say with confidence when the previous eruption occurred.
The stakes are highest in populated regions. Eifel, in western Germany, and La Garrotxa, in northeastern Spain, are areas where expanded monitoring could mean the difference between warning and catastrophe. Modern tools exist to detect subtle changes: satellites can identify small ground deformations, and geophysical methods can reveal what lies beneath the crust. The Pinatubo eruption in the Philippines in 1991 was preceded by thousands of small tremors—signals that, if recognized and acted upon, can save lives.
The message from this research is unsettling in its simplicity: 10,000 years of silence guarantees nothing. When magma continues to move and accumulate below the surface, the next eruption may arrive far sooner than an old classification suggests. The question now facing the scientific community is whether monitoring systems will expand to match this new understanding before a supposedly extinct volcano surprises an unprepared region.
Citas Notables
Volcanoes that appear extinct today perhaps are not really extinct— Răzvan-Gabriel Popa, ETH Zurich
A region that appears dormant may actually be accumulating pressure without giving clear surface signals— Research team findings
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that Methana was quiet for 110,000 years instead of, say, 50,000? Isn't the point just that it was dormant for a very long time?
The length matters because it breaks the rule we've been using. If 10,000 years means extinct, then 110,000 years should mean very, very extinct. But it wasn't. The volcano came back. That means our rule is wrong—or at least incomplete.
So the scientists are saying we should stop using the 10,000-year threshold altogether?
Not exactly. They're saying time alone is not enough. You need to look at what's actually happening underground—is magma moving? Is the ground shifting? Are there tremors? A volcano can look dead on the surface while building pressure below.
That sounds harder to monitor. How would you even know if magma is accumulating somewhere?
Satellites can detect tiny ground deformations. Seismic networks pick up small earthquakes. Geophysical instruments measure changes in the subsurface. The tools exist. The question is whether we're using them in the right places—especially near cities.
And if we don't? If a volcano near a populated area suddenly wakes up?
Then you have a region that thought it was safe, with no warning systems in place, no evacuation plans, no preparation. That's when dormancy becomes disaster.
Is Methana itself a threat to Athens?
Methana is near Athens, but the real concern is the pattern it reveals. There are other volcanoes—in Germany, Spain, Romania, Iran—that we've classified as extinct using the same flawed logic. Any of them could be accumulating magma right now.