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Origin of the Yellowstone Caldera. Caldera, which lies at the heart of Yellowstone National Park, is the tip of a huge volcano, which is in turn, bound to a hot spot.This is a fixed point within the earth's crust, where hot magma rises to the top. This accumulates below the earth's surface, thereby forming an underground magma chamber.aldera, which lies at the heart of Yellowstone National Park, is the tip of a huge volcano, which is in turn, bound to a hot spot. This is a fixed point within the earth's crust, where hot magma rises to the top.
Not all caldera are associated with a volcanic cone. Note the size of this caldera at Yellowstone. This caldera formed from the huge blast (and later collapse) of a massive eruption that took place around 630,000 years ago.This map shows the extent of ash from two yellow stone eruptions compared to the 1980 eruption of Mt St Helens