The northwest corner of Arizona was hit with four small earthquakes on Monday, January 13, ranging in magnitude from 1.0 to 2.8. They follow a magnitude 3.4 event that occurred last Friday, January 10. [Right, yellow dots are epicenters recorded over the past seven days. The larger one south of Mesquite is the M=3.4 from January 10. The other events in Arizona all occurred on January 13. Credit, USGS]
The day started with a magnitude 1.0 at 1:15 a.m south of Colorado City. The others were further west, closer to the Nevada border, with a M=1.7 at 12:43 p.m., a M=2.8 at 5:06 p.m., and finishing the day with a M=1.9 just a few seconds before midnight.
There is no indication the events are linked. This area of the state lies within the southern end of the Intermountain Seismic Belt.