A magnitude 3.8 earthquake struck at 06:49 a.m. this morning in the area of northwest Arizona that has seen a continuing swarm of over 55 earthquakes that started March 28. This is the largest event yet recorded in the swarm sequence, just surpassing the M=3.7 event of April 17.
There are reports of the tremor being felt in Arizona and Nevada. There are no reports of damage.
[Right, orange star marks epicenter of quake. Red lines are known active faults. Credit, USGS]