Shifting Ground

Before the earthquake on June 30, 1975, the observation platform extended one hundred feet farther into the canyon. The main tremor and numerous aftershocks measuring 6.1 on the Richter scale shattered a portion of this cliff, tumbling it into the gorge. Up and down the canyon, evidence of other rockfalls is visible. This section of the Yellowstone River overlies a major fracture zone, and the park records thousands of minor tremors annually. The scenery may not be the same when people return.

Wyoming · United States