Old Faithful Geyser in August of 1997.
Copyrighted photo by Christopher Schweiss.
Yellowstone National Park rests in a huge caldera. It has been the location of three very large eruptions in the last two million years. The volume of lava erupted from the Yellowstone caldera during these events makes the 1980 eruption of Mt. St. Helens look extremely small. Because of this, Yellowstone is considered to be one of the most dangerous volcanoes in the United States.
Yellowstone in the News