Series of earthquakes south of Colorado City

There was a magnitude 2.9 earthquake a few minutes ago (4:36 PM local time), 16 miles south of Colorado City in northern Arizona. This follows two smaller quakes that occurred in the early morning yesterday. A magnitude 2.2 event was recorded in about the same location at 1:03 AM on Dec. 12, followed by a magnitude 1.7 quake at 2:44 AM.

There were two similarly small quakes a few miles to the northeast on Dec. 8.

[Right, M2.9 quake in red. Others in yellow. Credit, USGS]