A supervolcano is a volcano on a massive scale. It is different from a volcano because:

  • it erupts at least 1,000 km3 of material (a large volcano erupts around 1 km3);
  • it forms a depression, called a caldera (a volcano forms a cone shape);
  • often has a ridge of higher land around it;
  • erupts less frequently - eruptions are hundreds of thousands of years apart.
The first stage of a supervolcano

The stages in the creation of a supervolcano caldera