The magnitude 3.4 quake was centered 22 miles north-northeast of the town of Morenci, near the Arizona-New Mexico border. There are no reports of damage or injuries.
Morenci is a town of about 1,800 people, many of whom work at the nearby Morenci Mine, the largest open-pit copper mine in North America. Mine operator Freeport-McMoRan has not reported any damage at the mine following the earthquake.
According to the USGS, this morning's earthquake continues a swarm of small temblors that have happened in the Morenci area since October 8.
Learn more about earthquake monitoring in Arizona in this AZPM story.