A magnitude 3.7 earthquake shook northwestern Arizona south of Littlefield, Ariz., at 9:06 p.m. on April 17.
This event is part of a swarm of more than 42 small magnitude (M) earthquakes that began on March 28 with an M2.1 event located approximately 29 miles SSE of Littlefield, Ariz. The most recent event, M1.3, occurred at 4:58 p.m. (MST) on April 18.
The M3.7 event was the largest earthquake yet and was felt in Littlefield and Mesquite, NV, along the remote Arizona-Nevada border. The depths of the earthquakes range from near-surface to approximately 14km.