Earthquake Causes Tsunami. Energy accumulates in the overriding plate until it exceeds the frictional forces between the two stuck plates. When this happens, the overriding plate snaps back into an unrestrained position. This sudden motion is the cause of the tsunami - because it gives an enormous shove to the overlying water.
Ajo is in the Sonoran Desert, tucked away in Western Pima County in Arizona, about 120 miles southwest of Phoenix and 130 miles west of Tucson.
Pinal County, Arizona. Pinal County is a county in the central part of the U.S. state of Arizona. As of the 2010 census, the population was 375,770, making it Arizona's third-most populous county. The county seat is Florence. The county was founded in 1875.