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Can we predict the next supervolcano eruption?

New technique can estimate the maximum size of a future super-eruption in Sumatra.

Illustration of an ultra-plinian volcanic eruption seen from an altitude of around 40 km.
Illustration of an ultra-plinian volcanic eruption seen from an altitude of around 40 km. These eruptions form ash clouds that can reach tens of kilometres into the sky. Credit: MARK GARLICK/SCIENCE PHOTO LIBRARY/Getty Images