Live volcanoes

Nobody knows how many active volcanoes there are on the Earth. For one thing, activity does not necessarily mean that a volcano is spurting lava right now. Signs of life in recent decades that might be resumed in the future are enough for a volcano to be viewed as active. In August 2005, some thorough people at Michigan Technological University in the US had a stab at cataloguing the Earth's active volcanoes (see

They found:

All of these are active or have been recently. To them must be added the large number of ocean ridges where more or less continuous volcanism is in progress.

Every Wednesday, the US Geological Survey and the Smithsonian Institution issue their weekly alert on volcanic activity. It excludes long-running activity and sea-floor volcanism, focusing on new and potentially hazardous volcanism. See

For more general information see:

Cascades Volcano Observatory

USGS Volcano Hazards Program