On April 10, 2013, the Bingham Canyon Mine experienced one of the largest landslides in North American history. Seismometers picked up two major events, each lasting about 90 seconds and separated by 1.5 hours — equivalent in energy to a magnitude 5.1 and 4.9 earthquake. Unlike a typical earthquake, the seismic signal confirmed it was a massive slide of rock and earth, not tectonic plates shifting. The landslide even triggered 16 small traditional earthquakes in the days that followed.