Volcanoes that have a time between eruptions of 1,000 years or greater always have a Volcanic Explosivity Index of 5 or greater.

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The Volcanic Explosivity Index (VEI) measures the explosiveness of volcanic eruptions, and while longer repose periods can lead to more significant eruptions due to the accumulation of magma and gases, it is not a rule that all volcanoes with long repose periods (1,000 years or greater) will always have eruptions with a VEI of 5 or greater. Eruptions depend on various factors including magma composition, magma chamber size, and tectonic settings, not just the time between eruptions.

Volcanoes That Have a Time Between Eruptions of 1,000 Years