A magnitude 3.4 quake was reported in northwestern Littlefield, Arizona (northwest of Flagstaff) yesterday, April 8th, 2016. No damage or injuries were reported. It’s the largest so far in a recent swarm of earthquakes in that area that started on March 29 with a magnitude 2.3 quake. Since then, 19 more small quakes have occurred in the same area. Some of those quakes are so small that you wouldn’t even notice them. There would need to be a minimum magnitude of 2.5 to 3 quake for people to feel them.
The Arizona Geological Survey (AZGS) said the area has several active faults and that there could be more potentially active faults in the area. Lee Allison, Director of AZGS said “There is always a small chance that these are foreshocks and something larger could happen, but that’s only usually a few percent of the time”. But also noted “At this point, we’re not anticipating anything larger, much larger than the earthquakes we’ve already seen”.
The largest earthquake in Arizona was a magnitude 5.6 near the Arizona-Utah border on July 21, 1959. There were reports of minor damage to chimneys and walls, broken windows, and a rockslide at Mather Point in the Grand Canyon was attributed to the shock according to the USGS.