The World's Deadliest Volcanoes
How do you measure the size of a volcanic eruption? Just as seismologists measure the size of
an earthquake using the Richter scale, volcanologists use an eruption
magnitude scale called the Volcanic Explosivity Index, or VEI to
classify eruptions. This scale assigns a number to an eruption based on things
that can be observed, such as the height of an eruptive plume and the volume of
the materials erupted.
Ready to rate the eruption you're watching? Here's what to do:
