January 31, 2002
Yellowstone National Park sits atop the caldera of one of the world's supervolcanoes, and is home to some 10,000 geothermal features. Shown above are several visible and infrared views of geothermal features found in the park. The temperature scale (Fahrenheit) below the infrared images will tell you which colors represent warmer or cooler temperatures. The temperatures on the scale are a measure of the heat or thermal radiation detected by an infrared camera, which was quite a distance away from the geothermal heat sources. Although the temperatures shown are not the actual temperatures of the geothermal features (which are much warmer!), they do show the relative distribution of heat.