Since the M5.2 event, 14 felt aftershocks (from M2.8 to M3.9) have rattled the area around Duncan in southeastern Arizona and southwestern New Mexico. Like the main shock, these were shallow events occurring about 3 miles deep. The largest aftershock, at M3.9, occurred at 3:56 p.m. on July 3. Since yesterday, July 10, five felt earthquakes have been reported. The largest were M3.6 temblors at 2:59 p.m. on July 10, and 10:33 a.m. on July 11. Hundreds of smaller magnitude aftershocks - less than ~ M3.0 - have occurred since the onset of activity, and most went largely unfelt.
People in southeastern Arizona should be prepared for ongoing M3.0 to M4.0 earthquakes over the next weeks or even months. In the event of strong ground shaking, follow the "Drop, Cover and Hold On" convention used in earthquake-prone areas. For more information on what to do in the event of an earthquake, please visit the Great Arizona ShakeOut website.
Comment: June 29, 2014: USGS: Earthquake Magnitude 5.2 - 89 miles NNE Douglas, Arizona