A series of explosions created a silica-filled water pool to the left of Tree Basin in Yellowstone National Park.

When geologists study volcanic hazards or try to anticipate what a volcano may do in the future, one of their primary tools is to examine the volcano’s past behavior.

Few geological scenarios capture public imagination quite like a full-scale eruption of the Yellowstone supervolcano. The fear is understandable: three massive caldera-forming eruptions have occurred ...

Venture too close to the hydrothermal vents dotted around Yellowstone National Park and you will be met by a powerful stench reminiscent of rotten eggs. These calderas are a (literal) hotbed of ...