EarthScope is Monitoring North America's Super-Volcano:
Yellowstone National Park
Have you ever visited Yellowstone National Park? The erupting geyser and burbling mud pools are a result of heat from the super-volcano located underneath the park. EarthScope instruments are giving us a new look at the internal workings of this super-volcano.
Touch the GPS stations to se the ground motion.

An Example GPS Station Plot
This simplified time series plot is a record of a GPS unit having moved about 20 millimeters (0.79 inches) over a three year period.
This 3D model of the magma plume under Yellowstone National Park was created using data from EarthScope instruments.
Question 1:
How has the ground elevation at Yellowstone National Park changed over time?