Dictionary of Human Evolution and Biology

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Ultra-Plinian Eruption

Very large volcanic eruption, as defined by measures on the Dust Veil Index and the Volcanic Explosivity Index; the Toba eruption on the island of Sumatra 74 kya was an example. Such eruptions are thought to reduce the amount of solar radiation that reaches the earth by more than 20% for a decade or more, and to have a significant cooling effect on the earth’s climate. Smaller eruptions are termed Hawaiian, Strombolian, Vulcanian, and Plinian eruptions.

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