The top tourist questions on Etna
“Can you see lava?” “What’s actually in there?” “Is it dangerous to get close?”
If you’ve ever visited Mount Etna, or plan to, chances are you’ve asked yourself something similar. Here’s what’s really happening inside an active crater, explained simply but backed by science.
What is an active crater?
An active crater is a volcanic vent that currently emits, or has the potential to emit, volcanic materials such as gases, steam, ash, lava, or rock fragments.
On Mount Etna, there are several active summit craters (like Bocca Nuova, Southeast Crater, Northeast Crater), all of which change frequently in shape and behavior.
What can you see inside an active crater?
It depends on the volcano’s activity, the weather, and your timing. During a visit, you might see:
In “calm” phases:
- Fumaroles (columns of steam and volcanic gas)
- Yellow or green mineral deposits (sulfur, iron, etc.)
- Hot fractured rock, not always glowing, but warm
- Deep volcanic sounds, like rumbling or “breathing”
- No visible lava, but intense subterranean heat
In more active phases:
- Ash plumes or lava fragments
- Lava fountains (effusive or explosive)
- Gas and magma bursts
- Glowing red lava, especially visible at night
Important: during active phases, access to summit craters is strictly prohibited for safety reasons. Only volcanologists with permits can get close.
Most frequently asked tourist questions about craters
“Can you actually see lava inside?”
Not always. Lava isn’t constantly bubbling like in the movies. More often, you’ll see gas, steam or glowing rock, visible lava is rare and usually only during eruptions.
“How deep is the crater?”
Some craters go over 100–200 meters deep, but it depends on recent activity. Visibility is often limited due to gas clouds and steep, unstable walls.
“Can it erupt without warning?”
Theoretically yes, but in reality, volcanic activity is constantly monitored, and eruptions show precursor signs. Certified guides avoid unsafe zones at all times.
“What does it smell like near a crater?”
A mix of rotten eggs (sulfur), hot metal, and steam. These are caused by sulfur dioxide and other volcanic gases.
“Why do craters change shape so often?”
Because they’re the result of internal pressure, explosions, collapses, and lava accumulation. A single eruption can dramatically reshape a crater.
“What happens under the crater?”
Beneath the crater is the magma chamber, a reservoir of molten rock. When pressure builds, magma rises and may erupt through the surface.
“Is it dangerous to stand near an active crater?”
Yes, if you ignore safety rules. But with a certified guide, on authorized trails, and during calm phases, the risk is very low. Never go alone.
What kind of gases emerge from a crater?
Main volcanic gases include:
- Sulfur dioxide (SO₂): the source of the strong sulfur smell
- Water vapor (H₂O): the most abundant volcanic gas
- Carbon dioxide (CO₂): heavier than air, dangerous in enclosed areas
- Acid gases (chlorides, fluorides): harmful in high concentrations
Our guides avoid high-gas zones and explain how the volcano “speaks” through its emissions.
Can you take photos inside a crater?
Yes, but with caution.
- Use zoom or drone (if authorized) to keep a safe distance
- Avoid prolonged exposure to gas
- Light and visibility are best in the early morning or late afternoon
Can you visit an active crater?
Yes, if:
- The crater is in a calm phase
- You’re with a certified volcano guide
- Access is authorized by local safety authorities
No, if:
- The crater shows any signs of activity
- There are official bans due to volcanic or weather risks
- You’re alone or off-trail without permission
Ask us which craters are safely visitable
Why are Etna’s craters so fascinating?
Because they’re windows into the Earth’s interior. Visiting a crater lets you:
- Feel heat coming from underground
- Watch gas emerge from invisible depths
- Hear the rumble of magma beneath your feet
It’s one of the few places in the world where the planet’s geological processes are visible in real time.
Want to learn more?
A guided excursion is the best way to get scientific answers, see real craters safely, and ask your own questions along the way.
Tell us what you’re curious about, we’ll suggest the right tour
