Thera eruption was bigger still

"The second largest volcanic eruption in human history was much larger than previously thought, scientists say.

The massive Bronze Age eruption of Thera near Greece would have devastated ancient civilisations in the region.

Ash would likely have plunged much of the Mediterranean into darkness, and tsunami would have wrecked local ports. "

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http://news.bbc.co.uk/1/hi/sci/tech/5287124.stm