National Parks Traveler Episode 70: The Yellowstone Volcano Observatory
There's always a lot of shaking, rattling, and occasional rolling going on in Yellowstone National Park. Keeping track of it is the Yellowstone Volcano Observatory, one of five such observatories under the purview of the U.S. Geological Survey. It keeps real-time tabs on volcanic, hydrothermal and earthquake activity in the Yellowstone Plateau volcanic field.