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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.
Mt. Usu is said to have 100,000-year long history of volcanic activity. A caldera was formed about 100,000 yeas ago when a large eruption emptied the magma chamber beneath the volcano. The island at the center of the water-filled caldera was formed as the result of a series of eruptions occurred about 40,000 years ago.