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Geology glossary

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base surge

Volcanology
Base surge deposits from the great Minoan eruption on Santorini (ca. 1613 BC)
Base surge deposits from the great Minoan eruption on Santorini (ca. 1613 BC)
Base surges are ground hugging, fast outward moving and turbulent, dilute clouds of gas and ash. They result from water magma interactions (violent steam explosions). During the 1965 eruption of Taal volcano (Philippines), such base surges were first observed. Some of them traveled 4 km and killed 189 people. Base surges were first identified during ocean nuclear weapons explosions in the Pacific.

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pyroclastic flow
 

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