M3.3 Earthquake & aftershocks in northwestern-most Arizona

At 7:03 a.m. on 28 August, a magnitude 3.3 earthquake occurred in the northwest corner of Arizona about 20 miles SSE of Mesquite, Nevada. Seven smaller aftershocks followed on the heels of the initial event (Table 1, Figure 1).

According to AZGS geologist Jeri Young, the earthquakes occurred just west of the Grand Wash Fault.  The range of depths, from 0 to 13 km is not uncommon ‘due to the westward stepping off the Colorado Plateau here.’