Will there be another eruption

What you can and cannot say

You can say that Mount Vesuvius is active, that its last eruption was in March 1944, and that it has been quiet since then. You cannot say when it will erupt next. There is no schedule, no cycle that can be read like a train timetable, and the word "overdue" applied to a volcano means nothing. Anyone who gives you a date is telling you something that no one knows.

What you can do, and have been doing for nearly two centuries, is observe. The Vesuvius Observatory was founded in 1841, the first in the world dedicated to a volcano, and today it is part of the INGV. Monitoring is continuous and focuses on the signals that precede an awakening: what are known in jargon as precursors. We have written about what "active" means in practice is Vesuvius active today.

The red zone, explained for those who don’t live here

The red zone is the area covered by the national evacuation plan: it includes roughly 25 municipalities and about 700,000 residents. It’s a concrete measure, with maps, partnerships with other Italian regions, and procedures. It’s not a permanent alarm: it’s the planning that’s done when a large population lives near an active volcano. Those who live here, and I’m one of them, live with it without thinking about it every day, just as you live with any planned risk.

The technical assumption of the plan is that an eruption wouldn’t come as a surprise. Precursory signals would be measurable, and the evacuation is built on that time margin. That’s why the history of two centuries of monitoring isn’t just a tourist guide detail: it’s the reason the plan makes sense.

What does all this have to do with your visit

Little, and it’s right to say so. Those who climb to the crater aren’t facing any particular volcanic risk: they’re walking half an hour uphill on loose gravel inside a national park with restricted entry. The closures that do happen are due to weather—wind and snow—and we discuss them in Vesuvius closed due to bad weather. The real risks of the day are in is it safe to climb.

79 AD, which is the reason for everything

The reason this volcano is the most monitored in the Mediterranean lies in its history: in 79 AD it buried Pompeii, Herculaneum, Oplontis and Stabiae, and Pompeii ended up under lapilli and ash. Walking through the ruins today and then climbing to the crater rim is the most direct way to understand why such serious planning takes place here. The connection between the two sites lies in Mount Vesuvius and Pompeii, and the combinations for seeing both in Pompeii and Vesuvius in one day.

The question we actually get asked

It’s not a question of *when* it will erupt. It’s *should I worry during the week I’m in Naples?* The answer is no—not because the volcano is dormant, but because it is monitored continuously, and any change in status would not go unnoticed. Come, climb, look at the bay, and leave the rest to those who measure it for a living.

Climb with those who study this mountain.

The Vesuvius Easy Tour includes a volcanological guide to the park, a minibus, a small group, and a skip-the-line ticket, departing from Naples or Pompeii.

Frequently asked questions