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The Campi Flegrei (Phlegraean Fields), west of Naples, tell a very different story. Here, the Earth doesn't just shake -it breathes. This extraordinary phenomenon is known as bradyseism, from the Greek words bradys (slow) and seismos (movement or earthquake). Unlike the violent motion we normally associate with earthquakes, bradyseism is the gradual uplift or subsidence of the ground, sometimes over years or even decades.
Imagine standing on the shore and returning years later to discover that the land beneath your feet has risen several metres -or sunk beneath the sea. That is exactly what has happened repeatedly in Campi Flegrei throughout history.
The explanation lies deep below the surface. Beneath the caldera, magma and hot volcanic fluids slowly move through a complex network of fractures. As pressure increases, the ground gently swells upward. When the pressure decreases, the land gradually sinks again. The process is usually measured in centimetres each year, but over time the changes become astonishing.
Few places on Earth provide clearer evidence of this than the Temple of Serapis in Pozzuoli. Despite its name, it was not a temple but a Roman marketplace built nearly two thousand years ago. Three marble columns have become world-famous because they preserve tiny holes made by marine molluscs. These shellfish can only survive underwater, meaning the columns must once have stood beneath the sea before rising again into the open air. Those small holes are far more than marks left by nature.
They are a geological diary written over centuries. No written chronicle could describe the slow movement of the Earth's crust with such remarkable precision. Bradyseism is not merely a curiosity from the past. It is still happening today.
Since the early 2000s, and particularly since 2018, Pozzuoli has experienced continuous uplift accompanied by thousands of small earthquakes. In some periods, the ground has risen by more than one metre within just a few years. Scientists carefully monitor every centimetre using satellites, GPS stations and seismic networks, making Campi Flegrei one of the most intensively observed volcanic regions in the world. For local residents, however, bradyseism is not simply a scientific concept. It is part of everyday life.
Doors suddenly become difficult to close because buildings have shifted by a few millimetres. New cracks appear in walls. The harbour must occasionally be adapted as the coastline slowly changes. Every small earthquake reminds people that the ground beneath them is alive. And yet, life continues. Children go to school. Fishermen leave the harbour before dawn. Families gather for dinner overlooking the Bay of Napoli. Perhaps that is what makes Campi Flegrei so fascinating. Here, geology is not hidden beneath mountains or buried in textbooks. It unfolds beneath people's homes, beneath Roman ruins, beneath cafés and narrow streets.
The Earth is constantly moving -but so slowly that an entire generation may barely notice it. Bradyseism reminds us that not all geological change is sudden or catastrophic. Sometimes the planet whispers instead of shouting. And nowhere does it whisper more eloquently than in the Campi Flegrei.
Campi Flegrei is one of the few places on Earth where you can almost feel the planet breathing beneath your feet.
More information: Io Non Rischio
We cannot stop natural disasters
but we can arm ourselves with knowledge:
so many lives wouldn't have to be lost
if there was enough disaster preparedness.
Petra Nemcova
