A series of minor earthquakes jolted the Phoenix area Sunday night, sending shock waves through several cities.
All three took place near Black Canyon City, Arizona, about 45 miles north of Phoenix.
The first, a magnitude 3.2 quake, struck at 8:59 p.m. (10:59 p.m. ET), the U.S. Geological Survey said.
The second, a magnitude 4.1 tremor, happened at 11:29 p.m.
The third, a magnitude 4.0 quake, took place at 11:49 p.m.
Several cities in the area felt shaking.
"Ground, walls and bed shook here in South Scottsdale...twice!" Deborah Groseclose tweeted.
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The U.S. Geological Survey has recorded three small earthquakes in north-central Oklahoma.
No injuries or damage have been reported.
The largest was a magnitude 3.5 quake at 11:55 p.m. Sunday that was centered about eight miles southwest of Medford and a second was a magnitude 2.9 temblor 16 miles east of Cherokee at 12:22 a.m. Monday.
The third was a magnitude 2.6 quake eight miles southwest of Perry.
Geologists say quakes of magnitude 2.5 to 3.0 are generally the smallest that are felt by humans and damage is not likely from quakes below magnitude 4.0
The Oklahoma Geological Survey has said it is likely that many recent earthquakes in the state have been triggered by the injection of wastewater from oil and natural gas drilling operations.
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