Photo detail

Arizona has hundreds of quakes and tremors each year, many of them near the Grand Canyon, but most are imperceptible to humans. (Photo by Chloe Jones/ Cronkite News)

Stories this photo appears in:

Tease photo

Arizona quakes are mostly minor, but hundreds happen every year

The July 5 quake near Ridgecrest, California, measured 7.1 on the Richter scale and followed a 6.4 magnitude temblor July 4.