ERUPTION HISTORY

The most famous eruption is the eruption that formed the present day caldera. About 600,000 years ago, the magma underneath the future Caldera had grown restless. The ground erupted, spewing out about 240 cubic miles of debri into the surrounding area. The park's central portion collapsed and formed the massive caldera. Three major cataclysmic eruptions have occured with in the last 2 million years