Check out our destinations and tours!
Follow us:
FacebookTwitterGoogle PlusYouTube

What are fumaroles?

Fumaroles at the Polyvotis Crater on Nisyros Island in Greece. Photo: Tobias Schorr
Fumaroles at the Polyvotis Crater on Nisyros Island in Greece. Photo: Tobias Schorr

Fumaroles are vents from which volcanic gas escapes into the atmosphere. Fumaroles may occur along tiny cracks or long fissures, in chaotic clusters or fields, and on the surfaces of lava flows and thick deposits of pyroclastic flows. They may persist for decades or centuries if they are above a persistent heat source (active Magma chamber) or disappear within weeks to months if they occur atop a fresh volcanic deposit that quickly cools. The teperatures rise from 70 C - 100 C or more. In some cases they are hidden in the ground (like in Stephanos-Crater on Nisyros) and you can break into them. The gases are dangerous and a gas-mask is often needed. They are alwas a sign of active volcanism.


More on VolcanoDiscovery:

Comments:

Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Text and images on this webpage are copyrighted. Further reproduction and use without authorization is not consented. If you need licensing rights for photographs, for example for publications and commercial use, please contact us.