Volcanoes can have a VEI of 1 or 8. Some have a VEI of 8, like Yellowstone! Name 1 volcano with a VEI of 1. Hint: It is a Volcanic Island. It starts with a S and ends with a I.
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Answer:
supervolcano is a large volcano that has had an eruption with a Volcanic Explosivity Index (VEI) of 8, the largest recorded value on the index. This means the volume of deposits for that eruption is greater than 1,000 cubic kilometers (240 cubic miles).[1]
Map of known VEI 7 and VEI 8 volcanoes around the world:
Volcanic Explosivity Index (VEI) 8 (Supervolcanoes)
Volcanic Explosivity Index (VEI) 7
Location of Yellowstone hotspot over time (numbers indicate millions of years before the present).
Satellite image of Lake Toba, the site of a VEI 8 eruption c. 75,000 years ago.
Cross-section through Long Valley Caldera.
Supervolcanoes occur when magma in the mantle rises into the crust but is unable to break through it and pressure builds in a large and growing magma pool until the crust is unable to contain the pressure. This can occur at hotspots (for example, Yellowstone Caldera) or at subduction zones (for example, Toba). Large-volume supervolcanic eruptions are also often associated with large igneous provinces, which can cover huge areas with lava and volcanic ash. These can cause long-lasting climate change (such as the triggering of a small ice age) and threaten species with extinction. The Oruanui eruption of New Zealand's Taupo Volcano (about 26,500 years ago)[2] was the world's most recent VEI-8 eruption