This three-dimensional perspective
view of Long Valley, California
Credit: NASA/JPL
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It is thought that one Indonesian super eruption 74,000 years ago was so large it almost destroyed the whole human race. The cause of super eruptions is believed to be a massive magma pool that is created a few miles under the earth's surface.
Previously, it was thought that this process takes 100,000-200,000 years until it is ready to erupt.
But researchers at Nashville's Vanderbilt University suggest a study published in the Public Library of Science ONE journal that in it might only take a few hundred years until it erupts.