PHOENIX, Nov. 2 (UPI) -- A rare series of three earthquakes near Black Canyon City, Ariz., the largest a 4.1- magnitude quake, shook the Phoenix area overnight.
The quakes came in intervals Sunday evening northeast of Black Canyon City, a town of about 2,600 people 40 miles from Phoenix.
There were no reports of injuries or damage, but the rumble of the final tremor at 11:30 p.m. could be heard and felt across metropolitan Phoenix. It was described as sounding like a distant explosion and rated a 4.0-magnitude by the U.S. Geological Survey in Golden, Colo.
The earlier quakes were of 3.2- and 4.1-magnitude ratings.
Arizona is removed from the West Coast's major fault lines, and earthquakes in the state are unusual. Sunday's tremors were weaker than those the state sustained in previous minor earthquakes in 2009 and in December 2014.
"In general, it's relatively small," said Zachary Reeves of the U.S. Geological Survey, referring to the 4.1-magnitude quake Sunday. "If people are in bed then people may not even be woken up by it."