Geology sets the stage of everything that happens in Yellowstone. It is also quite dynamic, with some features changing on a daily basis.
The last highly explosive Yellowstone eruption was approximately 174,000 years ago. It created what is now the West Thumb of Yellowstone Lake.
►Check it out!
Look at the map of ash fallout from the previous three major eruptions. If you live in the US, does your state have ash from the Yellowstone super volcano?
Yes. The heat undeneath the park fuels many of the hydrothermal features. Earthquakes (1,000 to 3,000 per year) reveal activity below ground. The University of Utah Seismograph Stations track this activity closely. Visit the university's seismograph web page to see real-time monitoring data.
Last updated: August 23, 2019