Science of seismic proportions (opens in new tab)

Arizona’s deserts might not be situated on a tectonic plate boundary where geographical activity can cause earthquakes, but that doesn’t make the state immune from the disturbance of tremors.It has been 139 years since Arizona’s strongest recorded earthquake on the Pitaycachi fault struck in 1887. The 7.5 magnitude event, known as the Sonoran Earthquake, took place near the southeastern Arizona-Mexico border.