Quake swarm resumes in northwest Arizona

Two earthquakes in northwest Arizona demonstrate the swarm activity is not over yet.   A magnitude 1.7 earthquake occurred just before midnight, followed by a magnitude 2.0 event at 10:21 a.m. local time this morning.   It's been a few days with no reported activity.   [Right, red dot marks the epicenter of the magnitude 2.0 event, the orange dot shows the smaller quake. The red lines are active faults. Credit, USGS]

We've seen over 60 earthquakes in this area since March 28 and cannot say how much longer they may continue.