The Arizona Geological Survey said two quakes occurred, including a magnitude 2.6 quake at 12:07 a.m.
There has been a swarm of 21 quakes in an area along the Arizona-Nevada line south-southwest of Littlefield, AZ, which is also close to southwestern Utah and the frequency and span puzzles geologists.
NW Arizona earthquake swarm keeps rolling on with two events today, including M2.6 at 12:07 am. pic.twitter.com/9jYcHj9HlxThe survey said the area has several active faults and that its geologic features suggest there could be additional potentially active faults just north of the largest quake.
— AZ Geological Survey (@AZGeology) April 24, 2016
The largest in the swarm was a magnitude 3.4 quake was reported at 2:23 a.m. on April 8.
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